Update CHANGELOG with towncrier

Load-Distribute test cases by filename

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,17 @@
+Thanks for submitting a PR, your contribution is really appreciated!
+
+Here's a quick checklist that should be present in PRs:
+
+- [ ] Make sure to include reasonable tests for your change if necessary
+
+- [ ] We use [towncrier](https://pypi.python.org/pypi/towncrier) for changelog management, so please add a *news* file into the `changelog` folder following these guidelines:
+  * Name it `$issue_id.$type` for example `588.bugfix`;
+  * If you don't have an issue_id change it to the PR id after creating it
+  * Ensure type is one of `removal`, `feature`, `bugfix`, `vendor`, `doc` or `trivial`
+  * Make sure to use full sentences with correct case and punctuation, for example:
+
+    ```
+    Fix issue with non-ascii contents in doctest text files.
+    ```
+
+

.gitignore

@@ -22,9 +22,12 @@ dist/
 include/
 lib/
 bin/
+xdist/_version.py*
 pytest_xdist.egg-info
 issue/
 3rdparty/
 pytestdebug.log
-.tox
-.cache
+.tox/
+.cache/
+.eggs/
+.idea/

.hgtags

@@ -1,18 +0,0 @@
-42c6503ee48fae9c4c96d406afb12bfc86f15803 1.0
-eca7ce17eabf296983c36812c8b8be901e7055a3 1.1
-56d8e5280be224a0ad3220a9deed55334710bd23 1.2
-e6c4ce20db4bf65086ff55807a3c306cad7ca393 1.3
-e6c4ce20db4bf65086ff55807a3c306cad7ca393 1.3
-eaf8b1cb7c312883598677231be5bbeea3b5c127 1.3
-a423748bf17ee778a37853225210257699cad9c1 1.4
-cd44a941c833c098e4899fe3d42a96703754d0d5 1.5
-4815040bdad8f182a5487f57a9da385483836e75 1.6
-20875fed94e7f3dff50bdf762df91153b15ceca6 1.7
-20875fed94e7f3dff50bdf762df91153b15ceca6 1.7
-29c38e195526f5f0fdd651fb51f59d6efaaafbb0 1.7
-0d1c00018008433956aa7d93007bab6ea7de96e4 1.8
-0d1c00018008433956aa7d93007bab6ea7de96e4 1.8
-1d27987c267577899350a25ba5828d55d87083ad 1.8
-5c5cb6d59e12e566fbb0217aea718dc31578bee1 1.9
-4406fc2a6427fadc021ed7e43e7aa5032b1ea91f 1.10
-220f6e46eb71a6212ccbe6b67b9e6edcf8ee4fa5 1.11

.travis.yml

@@ -0,0 +1,59 @@
+sudo: false
+language: python
+
+notifications:
+  irc:
+    channels:
+    - 'chat.freenode.net#pytest'
+    on_success: change
+    on_failure: change
+    skip_join: true
+  email:
+  - pytest-commit@python.org
+
+python:
+- '2.7'
+- '3.4'
+- '3.5'
+- '3.6'
+env:
+- TOXENV=py-pytest30
+- TOXENV=py-pytest31
+- TOXENV=py-pytest32
+- TOXENV=py-pytest33
+
+install: pip install tox setuptools_scm
+script: tox
+
+jobs:
+  include:
+    - stage: test
+    # python x env above are already included into this stage
+    - python: "2.7"
+      env: TOXENV=py27-pytestmaster
+    - python: "2.7"
+      env: TOXENV=py27-pytestfeatures
+    - python: "3.6"
+      env: TOXENV=py36-pytestmaster
+    - python: "3.6"
+      env: TOXENV=py36-pytestfeatures
+    - python: "3.6"
+      env: TOXENV=flakes
+    - python: "3.6"
+      env: TOXENV=readme
+
+    - stage: deploy
+      python: '3.6'
+      env:
+      install: pip install -U setuptools setuptools_scm
+      script: skip
+      deploy:
+        provider: pypi
+        user: ronny
+        distributions: sdist bdist_wheel  
+        skip_upload_docs: true
+        password:
+          secure: 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
+        on:
+          tags: true
+          repo: pytest-dev/pytest-xdist

CHANGELOG

@@ -1,149 +0,0 @@
-1.12
--------------------------
-
-- fix issue594: properly report errors when the test collection
-  is random.  Thanks Bruno Oliveira.
-
-- some internal test suite adaptation (to become forward
-  compatible with the upcoming pytest-2.8)
-
-
-1.11
--------------------------
-
-- fix pytest/xdist issue485 (also depends on py-1.4.22):
-  attach stdout/stderr on --boxed processes that die.
-
-- fix pytest/xdist issue503: make sure that a node has usually
-  two items to execute to avoid scoped fixtures to be torn down
-  pre-maturely (fixture teardown/setup is "nextitem" sensitive).
-  Thanks to Andreas Pelme for bug analysis and failing test.
-
-- restart crashed nodes by internally refactoring setup handling
-  of nodes.  Also includes better code documentation.  
-  Many thanks to Floris Bruynooghe for the complete PR.
-
-
-1.10
--------------------------
-
-- add glob support for rsyncignores, add command line option to pass
-  additional rsyncignores. Thanks Anatoly Bubenkov.
-
-- fix pytest issue382 - produce "pytest_runtest_logstart" event again
-  in master. Thanks Aron Curzon.
-
-- fix pytest issue419 by sending/receiving indices into the test 
-  collection instead of node ids (which are not neccessarily unique
-  for functions parametrized with duplicate values)
-
-- send multiple "to test" indices in one network message to a slave
-  and improve heuristics for sending chunks where the chunksize
-  depends on the number of remaining tests rather than fixed numbers.
-  This reduces the number of master -> node messages (but not the
-  reverse direction)
-
-
-1.9
--------------------------
-
-- changed LICENSE to MIT
-
-- fix duplicate reported test ids with --looponfailing
-  (thanks Jeremy Thurgood)
-
-- fix pytest issue41: re-run tests on all file changes, not just
-  randomly select ones like .py/.c.
-
-- fix pytest issue347: slaves running on top of Python3.2
-  will set PYTHONDONTWRITEYBTECODE to 1 to avoid import concurrency
-  bugs.
-
-1.8
--------------------------
-
-- fix pytest-issue93 - use the refined pytest-2.2.1 runtestprotocol
-  interface to perform eager teardowns for test items.
-
-1.7
--------------------------
-
-- fix incompatibilities with pytest-2.2.0 (allow multiple
-  pytest_runtest_logreport reports for a test item)
-
-1.6
--------------------------
-
-- terser collection reporting
-
-- fix issue34 - distributed testing with -p plugin now works correctly
-
-- fix race condition in looponfail mode where a concurrent file removal
-  could cause a crash
-
-1.5
--------------------------
-
-- adapt to and require pytest-2.0 changes, rsyncdirs and rsyncignore can now
-  only be specified in [pytest] sections of ini files, see "py.test -h"
-  for details.
-- major internal refactoring to match the pytest-2.0 event refactoring
-  - perform test collection always at slave side instead of at the master
-  - make python2/python3 bridging work, remove usage of pickling
-- improve initial reporting by using line-rewriting
-- remove all trailing whitespace from source
-
-1.4
--------------------------
-
-- perform distributed testing related reporting in the plugin
-  rather than having dist-related code in the generic py.test
-  distribution
-
-- depend on execnet-1.0.7 which adds "env1:NAME=value" keys to
-  gateway specification strings.
-
-- show detailed gateway setup and platform information only when
-  "-v" or "--verbose" is specified.
-
-1.3
--------------------------
-
-- fix --looponfailing - it would not actually run against the fully changed
-  source tree when initial conftest files load application state.
-
-- adapt for py-1.3.1's new --maxfailure option
-
-1.2
--------------------------
-
-- fix issue79: sessionfinish/teardown hooks are now called systematically
-  on the slave side
-- introduce a new data input/output mechanism to allow the master side
-  to send and receive data from a slave.
-- fix race condition in underlying pickling/unpickling handling
-- use and require new register hooks facility of py.test>=1.3.0
-- require improved execnet>=1.0.6 because of various race conditions
-  that can arise in xdist testing modes.
-- fix some python3 related pickling related race conditions
-- fix PyPI description
-
-1.1
--------------------------
-
-- fix an indefinite hang which would wait for events although no events
-  are pending - this happened if items arrive very quickly while
-  the "reschedule-event" tried unconditionally avoiding a busy-loop
-  and not schedule new work.
-
-1.0
--------------------------
-
-- moved code out of py-1.1.1 into its own plugin
-- use a new, faster and more sensible model to do load-balancing
-  of tests - now no magic "MAXITEMSPERHOST" is needed and load-testing
-  works effectively even with very few tests.
-- cleaned up termination handling
-- make -x cause hard killing of test nodes to decrease wait time
-  until the traceback shows up on first failure
-

CHANGELOG.rst

@@ -0,0 +1,404 @@
+pytest-xdist 1.21.0 (2017-12-22)
+================================
+
+Deprecations and Removals
+-------------------------
+
+- Drop support for EOL Python 2.6. (`#259
+  <https://github.com/pytest-dev/pytest-xdist/issues/259>`_)
+
+
+Features
+--------
+
+- New ``--dist=loadfile`` option which load-distributes test to workers grouped
+  by the file the tests live in. (`#242
+  <https://github.com/pytest-dev/pytest-xdist/issues/242>`_)
+
+
+Bug Fixes
+---------
+
+- Fix accidental mutation of test report during serialization causing longrepr
+  string-ification to break. (`#241
+  <https://github.com/pytest-dev/pytest-xdist/issues/241>`_)
+
+
+pytest-xdist 1.20.1 (2017-10-05)
+================================
+
+Bug Fixes
+---------
+
+- Fix hang when all worker nodes crash and restart limit is reached (`#45
+  <https://github.com/pytest-dev/pytest-xdist/issues/45>`_)
+
+- Fix issue where the -n option would still run distributed tests when pytest
+  was run with the --collect-only option (`#5
+  <https://github.com/pytest-dev/pytest-xdist/issues/5>`_)
+
+
+pytest-xdist 1.20.0 (2017-08-17)
+================================
+
+Features
+--------
+
+- ``xdist`` now supports tests to log results multiple times, improving
+  integration with plugins which require it like `pytest-rerunfailures
+  <https://github.com/gocept/pytest-rerunfailures>`_ and `flaky
+  <https://pypi.python.org/pypi/flaky>`_. (`#206 <https://github.com/pytest-
+  dev/pytest-xdist/issues/206>`_)
+
+
+Bug Fixes
+---------
+
+- Fix issue where tests were being incorrectly identified if a worker crashed
+  during the ``teardown`` stage of the test. (`#124 <https://github.com/pytest-
+  dev/pytest-xdist/issues/124>`_)
+
+
+pytest-xdist 1.19.1 (2017-08-10)
+================================
+
+Bug Fixes
+---------
+
+- Fix crash when transferring internal pytest warnings from workers to the
+  master node. (`#214 <https://github.com/pytest-dev/pytest-
+  xdist/issues/214>`_)
+
+
+pytest-xdist 1.19.0 (2017-08-09)
+================================
+
+Deprecations and Removals
+-------------------------
+
+- ``--boxed`` functionality has been moved to a separate plugin, `pytest-forked
+  <https://github.com/pytest-dev/pytest-forked>`_. This release now depends on
+  `` pytest-forked`` and provides ``--boxed`` as a backward compatibility
+  option. (`#1 <https://github.com/pytest-dev/pytest-xdist/issues/1>`_)
+
+
+Features
+--------
+
+- New ``--dist=loadscope`` option: sends group of related tests to the same
+  worker. Tests are grouped by module for test functions and by class for test
+  methods. See ``README.rst`` for more information. (`#191 <https://github.com
+  /pytest-dev/pytest-xdist/issues/191>`_)
+
+- Warnings are now properly transferred from workers to the master node. (`#92
+  <https://github.com/pytest-dev/pytest-xdist/issues/92>`_)
+
+
+Bug Fixes
+---------
+
+- Fix serialization of native tracebacks (``--tb=native``). (`#196
+  <https://github.com/pytest-dev/pytest-xdist/issues/196>`_)
+
+
+pytest-xdist 1.18.2 (2017-07-28)
+================================
+
+Bug Fixes
+---------
+
+- Removal of unnecessary dependency on incorrect version of py. (`#105
+  <https://github.com/pytest-dev/pytest-xdist/issues/105>`_)
+
+- Fix bug in internal event-loop error handler in the master node. This bug
+  would shadow the original errors making extremely hard/impossible for users
+  to diagnose the problem properly. (`#175 <https://github.com/pytest-
+  dev/pytest-xdist/issues/175>`_)
+
+
+pytest-xdist 1.18.1 (2017-07-05)
+================================
+
+Bug Fixes
+---------
+
+- Fixed serialization of ``longrepr.sections`` during error reporting from
+  workers. (`#171 <https://github.com/pytest-dev/pytest-xdist/issues/171>`_)
+
+- Fix ``ReprLocal`` not being unserialized breaking --showlocals usages. (`#176
+  <https://github.com/pytest-dev/pytest-xdist/issues/176>`_)
+
+
+pytest-xdist 1.18.0 (2017-06-26)
+================================
+
+- ``pytest-xdist`` now requires ``pytest>=3.0.0``.
+
+Features
+--------
+
+- Add long option `--numprocesses` as alternative for `-n`. (#168)
+
+
+Bug Fixes
+---------
+
+- Fix serialization and deserialization dropping longrepr details. (#133)
+
+
+pytest-xdist 1.17.1 (2017-06-10)
+================================
+
+Bug Fixes
+---------
+
+- Hot fix release reverting the change introduced by #124, unfortunately it
+  broke a number of test suites so we are reversing this change while we
+  investigate the problem. (#157)
+
+
+Improved Documentation
+----------------------
+
+- Introduced ``towncrier`` for ``CHANGELOG`` management. (#154)
+
+- Added ``HOWTORELEASE`` documentation. (#155)
+
+
+..
+    You should *NOT* be adding new change log entries to this file, this
+    file is managed by towncrier. You *may* edit previous change logs to
+    fix problems like typo corrections or such.
+    To add a new change log entry, please see
+    https://pip.pypa.io/en/latest/development/#adding-a-news-entry
+    We named the news folder ``changelog``
+
+.. towncrier release notes start
+
+
+1.17.0
+------
+
+- fix #124: xdist would mark test as complete after 'call' step. As a result,
+  xdist could identify the wrong test as failing when test crashes at teardown.
+  To address this issue, xdist now marks test as complete at teardown.
+
+1.16.0
+------
+
+- ``pytest-xdist`` now requires pytest 2.7 or later.
+
+- Add ``worker_id`` attribute in the TestReport
+
+- new hook: ``pytest_xdist_make_scheduler(config, log)``, can return custom tests items
+  distribution logic implementation. You can take a look at built-in ``LoadScheduling``
+  and ``EachScheduling`` implementations. Note that required scheduler class public
+  API may change in next ``pytest-xdist`` versions.
+
+1.15.0
+------
+
+- new ``worker_id`` fixture, returns the id of the worker in a test or fixture.
+  Thanks Jared Hellman for the PR.
+
+- display progress during collection only when in a terminal, similar to pytest #1397 issue.
+  Thanks Bruno Oliveira for the PR.
+
+- fix internal error message when ``--maxfail`` is used (#62, #65).
+  Thanks Collin RM Stocks and Bryan A. Jones for reports and Bruno Oliveira for the PR.
+
+
+1.14
+----
+
+- new hook: ``pytest_xdist_node_collection_finished(node, ids)``, called when
+  a worker has finished collection. Thanks Omer Katz for the request and
+  Bruno Oliveira for the PR.
+
+- fix README display on pypi
+
+- fix #22: xdist now works if the internal tmpdir plugin is disabled.
+  Thanks Bruno Oliveira for the PR.
+
+- fix #32: xdist now works if looponfail or boxed are disabled.
+  Thanks Bruno Oliveira for the PR.
+
+
+1.13.1
+-------
+
+- fix a regression -n 0 now disables xdist again
+
+
+1.13
+-------------------------
+
+- extended the tox matrix with the supported py.test versions
+
+- split up the plugin into 3 plugin's
+  to prepare the departure of boxed and looponfail.
+
+  looponfail will be a part of core
+  and forked boxed will be replaced
+  with a more reliable primitive based on xdist
+
+- conforming with new pytest-2.8 behavior of returning non-zero when all
+  tests were skipped or deselected.
+
+- new "--max-slave-restart" option that can be used to control maximum
+  number of times pytest-xdist can restart slaves due to crashes. Thanks to
+  Anatoly Bubenkov for the report and Bruno Oliveira for the PR.
+
+- release as wheel
+
+- "-n" option now can be set to "auto" for automatic detection of number
+  of cpus in the host system. Thanks Suloev Dmitry for the PR.
+
+1.12
+-------------------------
+
+- fix issue594: properly report errors when the test collection
+  is random.  Thanks Bruno Oliveira.
+
+- some internal test suite adaptation (to become forward
+  compatible with the upcoming pytest-2.8)
+
+
+1.11
+-------------------------
+
+- fix pytest/xdist issue485 (also depends on py-1.4.22):
+  attach stdout/stderr on --boxed processes that die.
+
+- fix pytest/xdist issue503: make sure that a node has usually
+  two items to execute to avoid scoped fixtures to be torn down
+  pre-maturely (fixture teardown/setup is "nextitem" sensitive).
+  Thanks to Andreas Pelme for bug analysis and failing test.
+
+- restart crashed nodes by internally refactoring setup handling
+  of nodes.  Also includes better code documentation.
+  Many thanks to Floris Bruynooghe for the complete PR.
+
+
+1.10
+-------------------------
+
+- add glob support for rsyncignores, add command line option to pass
+  additional rsyncignores. Thanks Anatoly Bubenkov.
+
+- fix pytest issue382 - produce "pytest_runtest_logstart" event again
+  in master. Thanks Aron Curzon.
+
+- fix pytest issue419 by sending/receiving indices into the test
+  collection instead of node ids (which are not necessarily unique
+  for functions parametrized with duplicate values)
+
+- send multiple "to test" indices in one network message to a slave
+  and improve heuristics for sending chunks where the chunksize
+  depends on the number of remaining tests rather than fixed numbers.
+  This reduces the number of master -> node messages (but not the
+  reverse direction)
+
+
+1.9
+-------------------------
+
+- changed LICENSE to MIT
+
+- fix duplicate reported test ids with --looponfailing
+  (thanks Jeremy Thurgood)
+
+- fix pytest issue41: re-run tests on all file changes, not just
+  randomly select ones like .py/.c.
+
+- fix pytest issue347: slaves running on top of Python3.2
+  will set PYTHONDONTWRITEYBTECODE to 1 to avoid import concurrency
+  bugs.
+
+1.8
+-------------------------
+
+- fix pytest-issue93 - use the refined pytest-2.2.1 runtestprotocol
+  interface to perform eager teardowns for test items.
+
+1.7
+-------------------------
+
+- fix incompatibilities with pytest-2.2.0 (allow multiple
+  pytest_runtest_logreport reports for a test item)
+
+1.6
+-------------------------
+
+- terser collection reporting
+
+- fix issue34 - distributed testing with -p plugin now works correctly
+
+- fix race condition in looponfail mode where a concurrent file removal
+  could cause a crash
+
+1.5
+-------------------------
+
+- adapt to and require pytest-2.0 changes, rsyncdirs and rsyncignore can now
+  only be specified in [pytest] sections of ini files, see "py.test -h"
+  for details.
+- major internal refactoring to match the pytest-2.0 event refactoring
+  - perform test collection always at slave side instead of at the master
+  - make python2/python3 bridging work, remove usage of pickling
+- improve initial reporting by using line-rewriting
+- remove all trailing whitespace from source
+
+1.4
+-------------------------
+
+- perform distributed testing related reporting in the plugin
+  rather than having dist-related code in the generic py.test
+  distribution
+
+- depend on execnet-1.0.7 which adds "env1:NAME=value" keys to
+  gateway specification strings.
+
+- show detailed gateway setup and platform information only when
+  "-v" or "--verbose" is specified.
+
+1.3
+-------------------------
+
+- fix --looponfailing - it would not actually run against the fully changed
+  source tree when initial conftest files load application state.
+
+- adapt for py-1.3.1's new --maxfailure option
+
+1.2
+-------------------------
+
+- fix issue79: sessionfinish/teardown hooks are now called systematically
+  on the slave side
+- introduce a new data input/output mechanism to allow the master side
+  to send and receive data from a slave.
+- fix race condition in underlying pickling/unpickling handling
+- use and require new register hooks facility of py.test>=1.3.0
+- require improved execnet>=1.0.6 because of various race conditions
+  that can arise in xdist testing modes.
+- fix some python3 related pickling related race conditions
+- fix PyPI description
+
+1.1
+-------------------------
+
+- fix an indefinite hang which would wait for events although no events
+  are pending - this happened if items arrive very quickly while
+  the "reschedule-event" tried unconditionally avoiding a busy-loop
+  and not schedule new work.
+
+1.0
+-------------------------
+
+- moved code out of py-1.1.1 into its own plugin
+- use a new, faster and more sensible model to do load-balancing
+  of tests - now no magic "MAXITEMSPERHOST" is needed and load-testing
+  works effectively even with very few tests.
+- cleaned up termination handling
+- make -x cause hard killing of test nodes to decrease wait time
+  until the traceback shows up on first failure

HOWTORELEASE.rst

@@ -0,0 +1,45 @@
+======================
+Releasing pytest-xdist
+======================
+
+This document describes the steps to make a new ``pytest-xdist`` release.
+
+Version
+-------
+
+``master`` should always be green and a potential release candidate. ``pytest-xdist`` follows
+semantic versioning, so given that the current version is ``X.Y.Z``, to find the next version number
+one needs to look at the ``changelog`` folder:
+
+- If there is any file named ``*.feature``, then we must make a new **minor** release: next
+  release will be ``X.Y+1.0``.
+
+- Otherwise it is just a **bug fix** release: ``X.Y.Z+1``.
+
+
+Steps
+-----
+
+To publish a new release ``X.Y.Z``, the steps are as follows:
+
+#. Create a new branch named ``release-X.Y.Z`` from the latest ``master``.
+
+#. Install ``pytest-xdist`` and dev requirements in a virtualenv::
+
+    $ pip install -e . -r dev-requirements.txt
+
+#. Update ``CHANGELOG.rst`` file by running::
+
+    $ towncrier --version X.Y.Z
+
+   It might ask for confirmation to remove news fragments; answer yes.
+
+#. Commit and push the branch for review.
+
+#. Once PR is **green** and **approved**, create and push a tag::
+
+    $ export VERSION=X.Y.Z
+    $ git tag v$VERSION release-$VERSION
+    $ git push git@github.com:pytest-dev/pytest-xdist.git v$VERSION
+
+That will build the package and publish it on ``PyPI`` automatically.

MANIFEST.in

@@ -1,7 +0,0 @@
-include CHANGELOG
-include LICENSE 
-include README.txt
-include setup.py
-include tox.ini
-graft testing
-prune .hg 

OVERVIEW.md

@@ -0,0 +1,78 @@
+# Overview #
+
+`xdist` works by spawning one or more **workers**, which are controlled
+by the **master**. Each **worker** is responsible for performing 
+a full test collection and afterwards running tests as dictated by the **master**.
+
+The execution flow is:
+
+1. **master** spawns one or more **workers** at the beginning of
+   the test session. The communication between **master** and **worker** nodes makes use of 
+   [execnet](http://codespeak.net/execnet/) and its [gateways](http://codespeak.net/execnet/basics.html#gateways-bootstrapping-python-interpreters).
+   The actual interpreters executing the code for the **workers** might
+   be remote or local. 
+  
+1. Each **worker** itself is a mini pytest runner. **workers** at this
+   point perform a full test collection, sending back the collected 
+   test-ids back to the **master** which does not
+   perform any collection itself.
+     
+1. The **master** receives the result of the collection from all nodes.
+   At this point the **master** performs some sanity check to ensure that
+   all **workers** collected the same tests (including order), bailing out otherwise.
+   If all is well, it converts the list of test-ids into a list of simple
+   indexes, where each index corresponds to the position of that test in the
+   original collection list. This works because all nodes have the same 
+   collection list, and saves bandwidth because the **master** can now tell
+   one of the workers to just *execute test index 3* index of passing the
+   full test id.
+   
+1. If **dist-mode** is **each**: the **master** just sends the full list
+   of test indexes to each node at this moment.
+   
+1. If **dist-mode** is **load**: the **master** takes around 25% of the
+   tests and sends them one by one to each **worker** in a round robin
+   fashion. The rest of the tests will be distributed later as **workers**
+   finish tests (see below).
+
+1. Note that `pytest_xdist_make_scheduler` hook can be used to implement custom tests distribution logic.
+   
+1. **workers** re-implement `pytest_runtestloop`: pytest's default implementation
+   basically loops over all collected items in the `session` object and executes
+   the `pytest_runtest_protocol` for each test item, but in xdist **workers** sit idly 
+   waiting for **master** to send tests for execution. As tests are
+   received by **workers**, `pytest_runtest_protocol` is executed for each test. 
+   Here it worth noting an implementation detail: **workers** always must keep at 
+   least one test item on their queue due to how the `pytest_runtest_protocol(item, nextitem)` 
+   hook is defined: in order to pass the `nextitem` to the hook, the worker must wait for more 
+   instructions from master before executing that remaining test. If it receives more tests, 
+   then it can safely call `pytest_runtest_protocol` because it knows what the `nextitem` parameter will be. 
+   If it receives a "shutdown" signal, then it can execute the hook passing `nextitem` as `None`. 
+   
+1. As tests are started and completed at the **workers**, the results are sent
+   back to the **master**, which then just forwards the results to 
+   the appropriate pytest hooks: `pytest_runtest_logstart` and 
+   `pytest_runtest_logreport`. This way other plugins (for example `junitxml`)
+   can work normally. The **master** (when in dist-mode **load**) 
+   decides to send more tests to a node when a test completes, using
+   some heuristics such as test durations and how many tests each **worker**
+   still has to run.
+   
+1. When the **master** has no more pending tests it will
+   send a "shutdown" signal to all **workers**, which will then run their 
+   remaining tests to completion and shut down. At this point the 
+   **master** will sit waiting for **workers** to shut down, still
+   processing events such as `pytest_runtest_logreport`.
+ 
+## FAQ ##
+
+> Why does each worker do its own collection, as opposed to having 
+the master collect once and distribute from that collection to the workers?
+
+If collection was performed by master then it would have to 
+serialize collected items to send them through the wire, as workers live in another process. 
+The problem is that test items are not easily (impossible?) to serialize, as they contain references to 
+the test functions, fixture managers, config objects, etc. Even if one manages to serialize it, 
+it seems it would be very hard to get it right and easy to break by any small change in pytest. 
+  
+

README.rst

@@ -0,0 +1,358 @@
+
+
+.. image:: http://img.shields.io/pypi/v/pytest-xdist.svg
+    :alt: PyPI version
+    :target: https://pypi.python.org/pypi/pytest-xdist
+
+.. image:: https://img.shields.io/pypi/pyversions/pytest-xdist.svg
+    :alt: Python versions
+    :target: https://pypi.python.org/pypi/pytest-xdist
+
+.. image:: https://anaconda.org/conda-forge/pytest-xdist/badges/version.svg
+    :alt: Anaconda version
+    :target: https://anaconda.org/conda-forge/pytest-xdist
+
+.. image:: https://travis-ci.org/pytest-dev/pytest-xdist.svg?branch=master
+    :alt: Travis CI build status
+    :target: https://travis-ci.org/pytest-dev/pytest-xdist
+
+.. image:: https://ci.appveyor.com/api/projects/status/56eq1a1avd4sdd7e/branch/master?svg=true
+    :alt: AppVeyor build status
+    :target: https://ci.appveyor.com/project/pytestbot/pytest-xdist
+
+xdist: pytest distributed testing plugin
+=========================================
+
+The `pytest-xdist`_ plugin extends py.test with some unique
+test execution modes:
+
+* test run parallelization_: if you have multiple CPUs or hosts you can use
+  those for a combined test run.  This allows to speed up
+  development or to use special resources of `remote machines`_.
+
+
+* ``--looponfail``: run your tests repeatedly in a subprocess.  After each run
+  py.test waits until a file in your project changes and then re-runs
+  the previously failing tests.  This is repeated until all tests pass
+  after which again a full run is performed.
+
+* `Multi-Platform`_ coverage: you can specify different Python interpreters
+  or different platforms and run tests in parallel on all of them.
+
+Before running tests remotely, ``py.test`` efficiently "rsyncs" your
+program source code to the remote place.  All test results
+are reported back and displayed to your local terminal.
+You may specify different Python versions and interpreters.
+
+
+Installation
+-----------------------
+
+Install the plugin with::
+
+    pip install pytest-xdist
+
+or use the package in develop/in-place mode with
+a checkout of the `pytest-xdist repository`_ ::
+
+    python setup.py develop
+
+Usage examples
+---------------------
+
+.. _parallelization:
+
+Speed up test runs by sending tests to multiple CPUs
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+To send tests to multiple CPUs, type::
+
+    py.test -n NUM
+
+Especially for longer running tests or tests requiring
+a lot of IO this can lead to considerable speed ups. This option can
+also be set to ``auto`` for automatic detection of the number of CPUs.
+
+If a test crashes the interpreter, pytest-xdist will automatically restart
+that slave and report the failure as usual. You can use the
+``--max-slave-restart`` option to limit the number of slaves that can
+be restarted, or disable restarting altogether using ``--max-slave-restart=0``.
+
+
+Running tests in a Python subprocess
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+To instantiate a python2.5 sub process and send tests to it, you may type::
+
+    py.test -d --tx popen//python=python2.5
+
+This will start a subprocess which is run with the "python2.5"
+Python interpreter, found in your system binary lookup path.
+
+If you prefix the --tx option value like this::
+
+    --tx 3*popen//python=python2.5
+
+then three subprocesses would be created and tests
+will be load-balanced across these three processes.
+
+.. _boxed:
+
+Running tests in a boxed subprocess
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+If you have tests involving C or C++ libraries you might have to deal
+with tests crashing the process.  For this case you may use the boxing
+options::
+
+    py.test --boxed
+
+which will run each test in a subprocess and will report if a test
+crashed the process.  You can also combine this option with
+running multiple processes to speed up the test run and use your CPU cores::
+
+    py.test -n3 --boxed
+
+this would run 3 testing subprocesses in parallel which each
+create new boxed subprocesses for each test.
+
+
+.. _`remote machines`:
+
+Sending tests to remote SSH accounts
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+Suppose you have a package ``mypkg`` which contains some
+tests that you can successfully run locally. And you
+have a ssh-reachable machine ``myhost``.  Then
+you can ad-hoc distribute your tests by typing::
+
+    py.test -d --tx ssh=myhostpopen --rsyncdir mypkg mypkg
+
+This will synchronize your :code:`mypkg` package directory
+to an remote ssh account and then locally collect tests
+and send them to remote places for execution.
+
+You can specify multiple :code:`--rsyncdir` directories
+to be sent to the remote side.
+
+.. note::
+
+  For py.test to collect and send tests correctly
+  you not only need to make sure all code and tests
+  directories are rsynced, but that any test (sub) directory
+  also has an :code:`__init__.py` file because internally
+  py.test references tests as a fully qualified python
+  module path.  **You will otherwise get strange errors**
+  during setup of the remote side.
+
+
+You can specify multiple :code:`--rsyncignore` glob patterns
+to be ignored when file are sent to the remote side.
+There are also internal ignores: :code:`.*, *.pyc, *.pyo, *~`
+Those you cannot override using rsyncignore command-line or
+ini-file option(s).
+
+
+Sending tests to remote Socket Servers
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+Download the single-module `socketserver.py`_ Python program
+and run it like this::
+
+    python socketserver.py
+
+It will tell you that it starts listening on the default
+port.  You can now on your home machine specify this
+new socket host with something like this::
+
+    py.test -d --tx socket=192.168.1.102:8888 --rsyncdir mypkg mypkg
+
+
+.. _`atonce`:
+.. _`Multi-Platform`:
+
+
+Running tests on many platforms at once
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+The basic command to run tests on multiple platforms is::
+
+    py.test --dist=each --tx=spec1 --tx=spec2
+
+If you specify a windows host, an OSX host and a Linux
+environment this command will send each tests to all
+platforms - and report back failures from all platforms
+at once.   The specifications strings use the `xspec syntax`_.
+
+.. _`xspec syntax`: http://codespeak.net/execnet/basics.html#xspec
+
+.. _`socketserver.py`: http://bitbucket.org/hpk42/execnet/raw/2af991418160/execnet/script/socketserver.py
+
+.. _`execnet`: http://codespeak.net/execnet
+
+Identifying the worker process during a test
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+*New in version 1.15.*
+
+If you need to determine the identity of a worker process in
+a test or fixture, you may use the ``worker_id`` fixture to do so:
+
+.. code-block:: python
+
+    @pytest.fixture()
+    def user_account(worker_id):
+        """ use a different account in each xdist worker """
+        return "account_%s" % worker_id
+
+When ``xdist`` is disabled (running with ``-n0`` for example), then
+``worker_id`` will return ``"master"``.
+
+Additionally, worker processes have the following environment variables
+defined:
+
+* ``PYTEST_XDIST_WORKER``: the name of the worker, e.g., ``"gw2"``.
+* ``PYTEST_XDIST_WORKER_COUNT``: the total number of workers in this session,
+  e.g., ``"4"`` when ``-n 4`` is given in the command-line.
+
+The information about the worker_id in a test is stored in the TestReport as
+well, under worker_id attribute.
+
+
+Specifying test exec environments in an ini file
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+pytest (since version 2.0) supports ini-style cofiguration.
+You can for example make running with three subprocesses
+your default like this:
+
+.. code-block:: ini
+
+    [pytest]
+    addopts = -n3
+
+You can also add default environments like this:
+
+.. code-block:: ini
+
+    [pytest]
+    addopts = --tx ssh=myhost//python=python2.5 --tx ssh=myhost//python=python3.6
+
+and then just type::
+
+    py.test --dist=each
+
+to run tests in each of the environments.
+
+
+Sending groups of related tests to the same worker
+++++++++++++++++++++++++++++++++++++++++++++++++++
+
+*New in version 1.19.*
+
+.. note::
+    This is an **experimental** feature: the actual functionality will
+    likely stay the same, but the CLI might change slightly in future versions.
+
+You can send groups of related tests to the same worker by using the
+``--dist=loadscope`` option. Tests will be grouped by **module**
+for *test functions* and by **class** for *test methods*.
+
+For example, consider this two test files:
+
+.. code-block:: python
+
+    # content of test_container.py
+    import pytest
+
+    def test_container_startup():
+        pass
+
+    def test_container_logging():
+        pass
+
+    @pytest.mark.parametrize('methods', ['ssh', 'http'])
+    def test_container_communication(methods):
+        pass
+
+    # content of test_io.py
+    class TestHDF:
+
+        def test_listing(self):
+            pass
+
+        def test_search(self):
+            pass
+
+
+    class TestXML:
+
+        def test_listing(self):
+            pass
+
+        def test_search(self):
+            pass
+
+
+By executing ``pytest -v --dist=loadscope -n4`` you might get this output
+(sorted by worker for readability)::
+
+    ============================= test session starts =============================
+    <skip header>
+    gw0 [8] / gw1 [8] / gw2 [8] / gw3 [8]
+    scheduling tests via LoadScopeScheduling
+
+    [gw0] PASSED test_container.py::test_container_communication[http]
+    [gw0] PASSED test_container.py::test_container_communication[ssh]
+    [gw0] PASSED test_container.py::test_container_logging
+    [gw0] PASSED test_container.py::test_container_startup
+    [gw1] PASSED test_io.py::TestHDF::test_listing
+    [gw1] PASSED test_io.py::TestHDF::test_search
+    [gw2] PASSED test_io.py::TestXML::test_listing
+    [gw2] PASSED test_io.py::TestXML::test_search
+
+    ========================== 8 passed in 0.56 seconds ===========================
+
+As you can see, all test functions from ``test_container.py`` executed on
+the same worker ``gw0``, while the test methods from classes ``TestHDF`` and
+``TestXML`` executed in workers ``gw1`` and ``gw2`` respectively.
+
+Currently the groupings can't be customized, with grouping by class takes
+priority over grouping by module.
+
+Sending tests to the same worker based on their file
+++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+*New in version 1.21.*
+
+.. note::
+    This is an **experimental** feature: the actual functionality will
+    likely stay the same, but the CLI might change slightly in future versions.
+
+You can send tests to the same worker grouped by their filename by using the
+``--dist=loadfile`` option, so tests of the same file are guaranteed to run
+in the same worker.
+
+Using the example in the previous section, all tests from ``test_container.py`` will
+run in the same worker, as well as the tests in ``test_io.py``.
+
+
+Specifying "rsync" dirs in an ini-file
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+In a ``tox.ini`` or ``setup.cfg`` file in your root project directory
+you may specify directories to include or to exclude in synchronisation:
+
+.. code-block:: ini
+
+    [pytest]
+    rsyncdirs = . mypkg helperpkg
+    rsyncignore = .hg
+
+These directory specifications are relative to the directory
+where the configuration file was found.
+
+.. _`pytest-xdist`: http://pypi.python.org/pypi/pytest-xdist
+.. _`pytest-xdist repository`: https://github.com/pytest-dev/pytest-xdist
+.. _`pytest`: http://pytest.org

README.txt

@@ -1,215 +0,0 @@
-.. image:: https://drone.io/bitbucket.org/pytest-dev/pytest-xdist/status.png
-   :target: https://drone.io/bitbucket.org/pytest-dev/pytest-xdist/latest
-.. image:: https://pypip.in/v/pytest-xdist/badge.png
-   :target: https://pypi.python.org/pypi/pytest-xdist
-
-xdist: pytest distributed testing plugin
-============================
-
-The `pytest-xdist`_ plugin extends py.test with some unique
-test execution modes:
-
-* test run parallelization_: if you have multiple CPUs or hosts you can use
-  those for a combined test run.  This allows to speed up
-  development or to use special resources of `remote machines`_.
-
-* ``--boxed``: (not available on Windows) run each test in a boxed_
-  subprocess to survive ``SEGFAULTS`` or otherwise dying processes
-
-* ``--looponfail``: run your tests repeatedly in a subprocess.  After each run
-  py.test waits until a file in your project changes and then re-runs
-  the previously failing tests.  This is repeated until all tests pass
-  after which again a full run is performed.
-
-* `Multi-Platform`_ coverage: you can specify different Python interpreters
-  or different platforms and run tests in parallel on all of them.
-
-Before running tests remotely, ``py.test`` efficiently "rsyncs" your
-program source code to the remote place.  All test results
-are reported back and displayed to your local terminal.
-You may specify different Python versions and interpreters.
-
-
-Installation
------------------------
-
-Install the plugin with::
-
-    easy_install pytest-xdist
-
-    # or
-
-    pip install pytest-xdist
-
-or use the package in develope/in-place mode with
-a checkout of the `pytest-xdist repository`_ ::
-
-    python setup.py develop
-
-Usage examples
----------------------
-
-.. _parallelization:
-
-Speed up test runs by sending tests to multiple CPUs
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-
-To send tests to multiple CPUs, type::
-
-    py.test -n NUM
-
-Especially for longer running tests or tests requiring
-a lot of IO this can lead to considerable speed ups.
-
-
-Running tests in a Python subprocess
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-
-To instantiate a python2.5 sub process and send tests to it, you may type::
-
-    py.test -d --tx popen//python=python2.5
-
-This will start a subprocess which is run with the "python2.5"
-Python interpreter, found in your system binary lookup path.
-
-If you prefix the --tx option value like this::
-
-    --tx 3*popen//python=python2.5
-
-then three subprocesses would be created and tests
-will be load-balanced across these three processes.
-
-.. _boxed:
-
-Running tests in a boxed subprocess
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-
-If you have tests involving C or C++ libraries you might have to deal
-with tests crashing the process.  For this case you may use the boxing
-options::
-
-    py.test --boxed
-
-which will run each test in a subprocess and will report if a test
-crashed the process.  You can also combine this option with
-running multiple processes to speed up the test run and use your CPU cores::
-
-    py.test -n3 --boxed
-
-this would run 3 testing subprocesses in parallel which each
-create new boxed subprocesses for each test.
-
-
-.. _`remote machines`:
-
-Sending tests to remote SSH accounts
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-
-Suppose you have a package ``mypkg`` which contains some
-tests that you can successfully run locally. And you
-have a ssh-reachable machine ``myhost``.  Then
-you can ad-hoc distribute your tests by typing::
-
-    py.test -d --tx ssh=myhostpopen --rsyncdir mypkg mypkg
-
-This will synchronize your ``mypkg`` package directory
-to an remote ssh account and then locally collect tests
-and send them to remote places for execution.
-
-You can specify multiple ``--rsyncdir`` directories
-to be sent to the remote side.
-
-**NOTE:** For py.test to collect and send tests correctly
-you not only need to make sure all code and tests
-directories are rsynced, but that any test (sub) directory
-also has an ``__init__.py`` file because internally
-py.test references tests as a fully qualified python
-module path.  **You will otherwise get strange errors**
-during setup of the remote side.
-
-You can specify multiple ``--rsyncignore`` glob-patterns
-to be ignored when file are sent to the remote side.
-There are also internal ignores: .*, *.pyc, *.pyo, *~
-Those you cannot override using rsyncignore command-line or
-ini-file option(s).
-
-
-Sending tests to remote Socket Servers
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-
-Download the single-module `socketserver.py`_ Python program
-and run it like this::
-
-    python socketserver.py
-
-It will tell you that it starts listening on the default
-port.  You can now on your home machine specify this
-new socket host with something like this::
-
-    py.test -d --tx socket=192.168.1.102:8888 --rsyncdir mypkg mypkg
-
-
-.. _`atonce`:
-.. _`Multi-Platform`:
-
-
-Running tests on many platforms at once
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-
-The basic command to run tests on multiple platforms is::
-
-    py.test --dist=each --tx=spec1 --tx=spec2
-
-If you specify a windows host, an OSX host and a Linux
-environment this command will send each tests to all
-platforms - and report back failures from all platforms
-at once.   The specifications strings use the `xspec syntax`_.
-
-.. _`xspec syntax`: http://codespeak.net/execnet/trunk/basics.html#xspec
-
-.. _`socketserver.py`: http://bitbucket.org/hpk42/execnet/raw/2af991418160/execnet/script/socketserver.py
-
-.. _`execnet`: http://codespeak.net/execnet
-
-Specifying test exec environments in an ini file
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-
-pytest (since version 2.0) supports ini-style cofiguration.
-You can for example make running with three subprocesses
-your default like this::
-
-    [pytest]
-    addopts = -n3
-
-You can also add default environments like this::
-
-    [pytest]
-    addopts = --tx ssh=myhost//python=python2.5 --tx ssh=myhost//python=python2.6
-
-and then just type::
-
-    py.test --dist=each
-
-to run tests in each of the environments.
-
-Specifying "rsync" dirs in an ini-file
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-
-In a ``tox.ini`` or ``setup.cfg`` file in your root project directory
-you may specify directories to include or to exclude in synchronisation::
-
-    [pytest]
-    rsyncdirs = . mypkg helperpkg
-    rsyncignore = .hg
-
-These directory specifications are relative to the directory
-where the configuration file was found.
-
-.. _`pytest-xdist`: http://pypi.python.org/pypi/pytest-xdist
-.. _`pytest-xdist repository`: http://bitbucket.org/pytest-dev/pytest-xdist
-.. _`pytest`: http://pytest.org
-
-Issue and Bug Tracker
-------------------------
-
-Please use the pytest issue tracker for bugs in this plugin, see https://bitbucket.org/hpk42/pytest/issues .

appveyor.yml

@@ -0,0 +1,19 @@
+environment:
+  matrix:
+  # note: please use "tox --listenvs" to populate the build matrix
+  - TOXENV: "py27-pytest33"
+  - TOXENV: "py34-pytest33"
+  - TOXENV: "py35-pytest33"
+  - TOXENV: "py36-pytest33"
+  - TOXENV: "py27-pytest33-pexpect"
+  - TOXENV: "py36-pytest33-pexpect"
+  - TOXENV: "flakes"
+  - TOXENV: "readme"
+
+install:
+  - C:\Python35\python -m pip install -U tox setuptools_scm pip
+
+build: false  # Not a C# project, build stuff at the test step instead.
+
+test_script:
+  - C:\Python35\python -m tox

changelog/_template.rst

@@ -0,0 +1,39 @@
+{% for section in sections %}
+{% set underline = "-" %}
+{% if section %}
+{{section}}
+{{ underline * section|length }}{% set underline = "~" %}
+
+{% endif %}
+{% if sections[section] %}
+{% for category, val in definitions.items() if category in sections[section] %}
+
+{{ definitions[category]['name'] }}
+{{ underline * definitions[category]['name']|length }}
+
+{% if definitions[category]['showcontent'] %}
+{% for text, values in sections[section][category]|dictsort(by='value') %}
+- {{ text }}{% if category != 'vendor' %} (`{{ values[0] }} <https://github.com/pytest-dev/pytest-xdist/issues/{{ values[0][1:] }}>`_){% endif %}
+
+
+{% endfor %}
+{% else %}
+- {{ sections[section][category]['']|sort|join(', ') }}
+
+
+{% endif %}
+{% if sections[section][category]|length == 0 %}
+
+No significant changes.
+
+
+{% else %}
+{% endif %}
+{% endfor %}
+{% else %}
+
+No significant changes.
+
+
+{% endif %}
+{% endfor %}

dev-requirements.txt

@@ -0,0 +1 @@
+towncrier

example/boxed.txt

@@ -1,8 +1,14 @@
+.. note::
+
+  Since 1.19.0, the actual implementation of the ``--boxed`` option has been moved to a 
+  separate plugin, `pytest-forked <https://github.com/pytest-dev/pytest-forked>`_ 
+  which can be installed independently. The ``--boxed`` command-line options remains 
+  for backward compatibility reasons.
 
 
 If your testing involves C or C++ libraries you might have to deal
 with crashing processes.  The xdist-plugin provides the ``--boxed`` option
-to run each test in a controled subprocess.  Here is a basic example::
+to run each test in a controlled subprocess.  Here is a basic example::
 
     # content of test_module.py
 
@@ -14,19 +20,19 @@ to run each test in a controled subprocess.  Here is a basic example::
     @pytest.mark.parametrize("arg", range(50))
     def test_func(arg):
         time.sleep(0.05) # each tests takes a while
-        if arg % 19 == 0: 
+        if arg % 19 == 0:
             os.kill(os.getpid(), 15)
 
 If you run this with::
 
-    $ py.test --boxed
+    $ py.test -n1
     =========================== test session starts ============================
     platform linux2 -- Python 2.7.3 -- pytest-2.3.0.dev8
     plugins: xdist, bugzilla, cache, oejskit, cli, pep8, cov
     collecting ... collected 50 items
-    
+
     test_module.py f..................f..................f...........
-    
+
     ================================= FAILURES =================================
     _______________________________ test_func[0] _______________________________
     /home/hpk/tmp/doc-exec-420/test_module.py:6: running the test CRASHED with signal 15
@@ -40,13 +46,13 @@ You'll see that a couple of tests are reported as crashing, indicated
 by lower-case ``f`` and the respective failure summary. You can also use
 the xdist-provided parallelization feature to speed up your testing::
 
-    $ py.test --boxed -n3
+    $ py.test -n3
     =========================== test session starts ============================
     platform linux2 -- Python 2.7.3 -- pytest-2.3.0.dev8
     plugins: xdist, bugzilla, cache, oejskit, cli, pep8, cov
     gw0 I / gw1 I / gw2 I
     gw0 [50] / gw1 [50] / gw2 [50]
-    
+
     scheduling tests via LoadScheduling
     ..f...............f..................f............
     ================================= FAILURES =================================

example/loadscope/epsilon/__init__.py

@@ -0,0 +1,37 @@
+def epsilon1(arg1, arg2=1000):
+    """Do epsilon1
+
+    Usage:
+
+    >>> epsilon1(10, 20)
+    40
+    >>> epsilon1(30)
+    1040
+    """
+    return arg1 + arg2 + 10
+
+
+def epsilon2(arg1, arg2=1000):
+    """Do epsilon2
+
+    Usage:
+
+    >>> epsilon2(10, 20)
+    -20
+    >>> epsilon2(30)
+    -980
+    """
+    return arg1 - arg2 - 10
+
+
+def epsilon3(arg1, arg2=1000):
+    """Do epsilon3
+
+    Usage:
+
+    >>> epsilon3(10, 20)
+    200
+    >>> epsilon3(30)
+    30000
+    """
+    return arg1 * arg2

example/loadscope/requirements.txt

@@ -0,0 +1,3 @@
+ipdb
+pytest
+../../

example/loadscope/test/test_alpha.py

@@ -0,0 +1,51 @@
+from time import sleep
+
+
+def test_alpha0():
+    sleep(5)
+    assert True
+
+
+def test_alpha1():
+    sleep(5)
+    assert True
+
+
+def test_alpha2():
+    sleep(5)
+    assert True
+
+
+def test_alpha3():
+    sleep(5)
+    assert True
+
+
+def test_alpha4():
+    sleep(5)
+    assert True
+
+
+def test_alpha5():
+    sleep(5)
+    assert True
+
+
+def test_alpha6():
+    sleep(5)
+    assert True
+
+
+def test_alpha7():
+    sleep(5)
+    assert True
+
+
+def test_alpha8():
+    sleep(5)
+    assert True
+
+
+def test_alpha9():
+    sleep(5)
+    assert True

example/loadscope/test/test_beta.py

@@ -0,0 +1,51 @@
+from time import sleep
+
+
+def test_beta0():
+    sleep(5)
+    assert True
+
+
+def test_beta1():
+    sleep(5)
+    assert True
+
+
+def test_beta2():
+    sleep(5)
+    assert True
+
+
+def test_beta3():
+    sleep(5)
+    assert True
+
+
+def test_beta4():
+    sleep(5)
+    assert True
+
+
+def test_beta5():
+    sleep(5)
+    assert True
+
+
+def test_beta6():
+    sleep(5)
+    assert True
+
+
+def test_beta7():
+    sleep(5)
+    assert True
+
+
+def test_beta8():
+    sleep(5)
+    assert True
+
+
+def test_beta9():
+    sleep(5)
+    assert True

example/loadscope/test/test_delta.py

@@ -0,0 +1,88 @@
+from time import sleep
+from unittest import TestCase
+
+
+class Delta1(TestCase):
+
+    def test_delta0(self):
+        sleep(5)
+        assert True
+
+    def test_delta1(self):
+        sleep(5)
+        assert True
+
+    def test_delta2(self):
+        sleep(5)
+        assert True
+
+    def test_delta3(self):
+        sleep(5)
+        assert True
+
+    def test_delta4(self):
+        sleep(5)
+        assert True
+
+    def test_delta5(self):
+        sleep(5)
+        assert True
+
+    def test_delta6(self):
+        sleep(5)
+        assert True
+
+    def test_delta7(self):
+        sleep(5)
+        assert True
+
+    def test_delta8(self):
+        sleep(5)
+        assert True
+
+    def test_delta9(self):
+        sleep(5)
+        assert True
+
+
+class Delta2(TestCase):
+
+    def test_delta0(self):
+        sleep(5)
+        assert True
+
+    def test_delta1(self):
+        sleep(5)
+        assert True
+
+    def test_delta2(self):
+        sleep(5)
+        assert True
+
+    def test_delta3(self):
+        sleep(5)
+        assert True
+
+    def test_delta4(self):
+        sleep(5)
+        assert True
+
+    def test_delta5(self):
+        sleep(5)
+        assert True
+
+    def test_delta6(self):
+        sleep(5)
+        assert True
+
+    def test_delta7(self):
+        sleep(5)
+        assert True
+
+    def test_delta8(self):
+        sleep(5)
+        assert True
+
+    def test_delta9(self):
+        sleep(5)
+        assert True

example/loadscope/test/test_gamma.py

@@ -0,0 +1,51 @@
+from time import sleep
+
+
+def test_gamma0():
+    sleep(5)
+    assert True
+
+
+def test_gamma1():
+    sleep(5)
+    assert True
+
+
+def test_gamma2():
+    sleep(5)
+    assert True
+
+
+def test_gamma3():
+    sleep(5)
+    assert True
+
+
+def test_gamma4():
+    sleep(5)
+    assert True
+
+
+def test_gamma5():
+    sleep(5)
+    assert True
+
+
+def test_gamma6():
+    sleep(5)
+    assert True
+
+
+def test_gamma7():
+    sleep(5)
+    assert True
+
+
+def test_gamma8():
+    sleep(5)
+    assert True
+
+
+def test_gamma9():
+    sleep(5)
+    assert True

example/loadscope/tox.ini

@@ -0,0 +1,17 @@
+[tox]
+envlist = test
+setupdir = {toxinidir}/../../
+
+[testenv:test]
+basepython = python3
+passenv = http_proxy https_proxy
+deps = -rrequirements.txt
+changedir = {envtmpdir}
+commands =
+    py.test -s -v \
+        --doctest-modules \
+        --junitxml=tests.xml \
+        --dist=loadscope \
+        --tx=8*popen \
+        {toxinidir}/test \
+        {toxinidir}/epsilon

pyproject.toml

@@ -0,0 +1,36 @@
+[tool.towncrier]
+package = "xdist"
+filename = "CHANGELOG.rst"
+directory = "changelog/"
+title_format = "pytest-xdist {version} ({project_date})"
+template = "changelog/_template.rst"
+
+  [[tool.towncrier.type]]
+  directory = "removal"
+  name = "Deprecations and Removals"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "feature"
+  name = "Features"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "bugfix"
+  name = "Bug Fixes"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "vendor"
+  name = "Vendored Libraries"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "doc"
+  name = "Improved Documentation"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "trivial"
+  name = "Trivial Changes"
+  showcontent = false

setup.cfg

@@ -0,0 +1,8 @@
+[bdist_wheel]
+universal = 1
+
+[metadata]
+license_file = LICENSE
+
+[flake8]
+max-line-length = 100

setup.py

@@ -1,30 +1,47 @@
-from setuptools import setup
+from setuptools import setup, find_packages
+
+install_requires = ['execnet>=1.1', 'pytest>=3.0.0', 'pytest-forked']
+
 
 setup(
     name="pytest-xdist",
-    version='1.12',
-    description='py.test xdist plugin for distributed testing and loop-on-failing modes',
-    long_description=open('README.txt').read(),
+    use_scm_version={'write_to': 'xdist/_version.py'},
+    description='py.test xdist plugin for distributed testing'
+                ' and loop-on-failing modes',
+    long_description=open('README.rst').read(),
     license='MIT',
     author='holger krekel and contributors',
     author_email='pytest-dev@python.org,holger@merlinux.eu',
-    url='http://bitbucket.org/hpk42/pytest-xdist',
+    url='https://github.com/pytest-dev/pytest-xdist',
     platforms=['linux', 'osx', 'win32'],
-    packages = ['xdist'],
-    entry_points = {'pytest11': ['xdist = xdist.plugin'],},
+    packages=find_packages(exclude=['testing', 'example']),
+    entry_points={
+        'pytest11': [
+            'xdist = xdist.plugin',
+            'xdist.looponfail = xdist.looponfail',
+        ],
+    },
     zip_safe=False,
-    install_requires = ['execnet>=1.1', 'pytest>=2.4.2', 'py>=1.4.22'],
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
+    install_requires=install_requires,
+    setup_requires=['setuptools_scm'],
     classifiers=[
-    'Development Status :: 5 - Production/Stable',
-    'Intended Audience :: Developers',
-    'License :: OSI Approved :: MIT License',
-    'Operating System :: POSIX',
-    'Operating System :: Microsoft :: Windows',
-    'Operating System :: MacOS :: MacOS X',
-    'Topic :: Software Development :: Testing',
-    'Topic :: Software Development :: Quality Assurance',
-    'Topic :: Utilities',
-    'Programming Language :: Python',
-    'Programming Language :: Python :: 3',
+        'Development Status :: 5 - Production/Stable',
+        'Framework :: Pytest',
+        'Intended Audience :: Developers',
+        'License :: OSI Approved :: MIT License',
+        'Operating System :: POSIX',
+        'Operating System :: Microsoft :: Windows',
+        'Operating System :: MacOS :: MacOS X',
+        'Topic :: Software Development :: Testing',
+        'Topic :: Software Development :: Quality Assurance',
+        'Topic :: Utilities',
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
     ],
 )

testing/acceptance_test.py

@@ -1,3 +1,5 @@
+import re
+
 import py
 import pytest
 
@@ -34,7 +36,7 @@ class TestDistribution:
         result = testdir.runpytest(p1, "-n1")
         assert result.ret == 1
         result.stdout.fnmatch_lines([
-            "E   ImportError: *__import_of_missing_module*",
+            "E   *Error: No module named *__import_of_missing_module*",
         ])
 
     def test_n2_import_error(self, testdir):
@@ -68,13 +70,14 @@ class TestDistribution:
                 pass
         """)
         result = testdir.runpytest(p1, '--tx=popen', '--tx=popen')
-        assert result.ret == 1
+        assert result.ret in (1, 2)
         result.stdout.fnmatch_lines([
-            "E   ImportError: *__import_of_missing_module*",
+            "E   *Error: No module named *__import_of_missing_module*",
         ])
 
     def test_manytests_to_one_popen(self, testdir):
-        p1 = testdir.makepyfile("""
+        p1 = testdir.makepyfile(
+            """
                 import py
                 def test_fail0():
                     assert 0
@@ -84,8 +87,7 @@ class TestDistribution:
                     pass
                 def test_skip():
                     py.test.skip("hello")
-            """,
-        )
+            """, )
         result = testdir.runpytest(p1, "-v", '-d', '--tx=popen', '--tx=popen')
         result.stdout.fnmatch_lines([
             "*1*Python*",
@@ -120,7 +122,8 @@ class TestDistribution:
         ])
 
     def test_dist_ini_specified(self, testdir):
-        p1 = testdir.makepyfile("""
+        p1 = testdir.makepyfile(
+            """
                 import py
                 def test_fail0():
                     assert 0
@@ -130,8 +133,7 @@ class TestDistribution:
                     pass
                 def test_skip():
                     py.test.skip("hello")
-            """,
-        )
+            """, )
         testdir.makeini("""
             [pytest]
             addopts = --tx=3*popen
@@ -163,13 +165,10 @@ class TestDistribution:
                     import os
                     time.sleep(0.5)
                     os.kill(os.getpid(), 15)
-            """
-        )
+            """)
         result = testdir.runpytest(p1, "-v", '-d', '-n1')
         result.stdout.fnmatch_lines([
-            "*Python*",
-            "*PASS**test_ok*",
-            "*node*down*",
+            "*Python*", "*PASS**test_ok*", "*node*down*",
             "*3 failed, 1 passed, 1 skipped*"
         ])
         assert result.ret == 1
@@ -182,13 +181,13 @@ class TestDistribution:
         p = subdir.join("test_one.py")
         p.write("def test_5():\n  assert not __file__.startswith(%r)" % str(p))
         result = testdir.runpytest("-v", "-d",
-            "--rsyncdir=%(subdir)s" % locals(),
-            "--tx=popen//chdir=%(dest)s" % locals(), p)
+                                   "--rsyncdir=%(subdir)s" % locals(),
+                                   "--tx=popen//chdir=%(dest)s" % locals(), p)
         assert result.ret == 0
         result.stdout.fnmatch_lines([
             "*0* *cwd*",
-            #"RSyncStart: [G1]",
-            #"RSyncFinished: [G1]",
+            # "RSyncStart: [G1]",
+            # "RSyncFinished: [G1]",
             "*1 passed*"
         ])
         assert dest.join(subdir.basename).check(dir=1)
@@ -220,15 +219,14 @@ class TestDistribution:
         """)
         p1 = testdir.makepyfile("def test_func(): pass")
         result = testdir.runpytest("-v", p1, '-d', '--tx=popen')
-        result.stdout.fnmatch_lines([
-            "*0*Python*",
-            "*calculated result is 49*",
-            "*1 passed*"
-        ])
+        result.stdout.fnmatch_lines(
+            ["*0*Python*", "*calculated result is 49*", "*1 passed*"])
         assert result.ret == 0
 
     def test_keyboardinterrupt_hooks_issue79(self, testdir):
-        testdir.makepyfile(__init__="", test_one="""
+        testdir.makepyfile(
+            __init__="",
+            test_one="""
             def test_hello():
                 raise KeyboardInterrupt()
         """)
@@ -258,11 +256,23 @@ class TestDistribution:
         """)
         child = testdir.spawn_pytest("-n1 -v")
         child.expect(".*test_sleep.*")
-        child.kill(2) # keyboard interrupt
+        child.kill(2)  # keyboard interrupt
         child.expect(".*KeyboardInterrupt.*")
-        #child.expect(".*seconds.*")
+        # child.expect(".*seconds.*")
         child.close()
-        #assert ret == 2
+        # assert ret == 2
+
+    def test_dist_with_collectonly(self, testdir):
+        p1 = testdir.makepyfile("""
+            def test_ok():
+                pass
+        """)
+        result = testdir.runpytest(p1, "-n1", "--collect-only")
+        assert result.ret == 0
+        result.stdout.fnmatch_lines([
+            "*collected 1 item*",
+        ])
+
 
 class TestDistEach:
     def test_simple(self, testdir):
@@ -270,11 +280,13 @@ class TestDistEach:
             def test_hello():
                 pass
         """)
-        result = testdir.runpytest_subprocess("--debug", "--dist=each", "--tx=2*popen")
+        result = testdir.runpytest_subprocess("--debug", "--dist=each",
+                                              "--tx=2*popen")
         assert not result.ret
         result.stdout.fnmatch_lines(["*2 pass*"])
 
-    @py.test.mark.xfail(run=False,
+    @py.test.mark.xfail(
+        run=False,
         reason="other python versions might not have py.test installed")
     def test_simple_diffoutput(self, testdir):
         interpreters = []
@@ -284,7 +296,9 @@ class TestDistEach:
                 py.test.skip("%s not found" % name)
             interpreters.append(interp)
 
-        testdir.makepyfile(__init__="", test_one="""
+        testdir.makepyfile(
+            __init__="",
+            test_one="""
             import sys
             def test_hello():
                 print("%s...%s" % sys.version_info[:2])
@@ -298,6 +312,7 @@ class TestDistEach:
         assert "2...5" in s
         assert "2...6" in s
 
+
 class TestTerminalReporting:
     def test_pass_skip_fail(self, testdir):
         testdir.makepyfile("""
@@ -335,6 +350,32 @@ class TestTerminalReporting:
             "E       assert 0",
         ])
 
+    @pytest.mark.parametrize('n', ['-n0', '-n1'])
+    @pytest.mark.parametrize('warn_type', ['pytest', 'builtin'])
+    def test_logwarning(self, testdir, n, warn_type):
+        from pkg_resources import parse_version
+        if parse_version(pytest.__version__) < parse_version('3.1'):
+            pytest.skip('pytest warnings requires >= 3.1')
+
+        if warn_type == 'builtin':
+            warn_code = """warnings.warn(UserWarning('this is a warning'))"""
+        elif warn_type == 'pytest':
+            warn_code = """request.config.warn('', 'this is a warning',
+                           fslocation=py.path.local())"""
+        else:
+            assert False
+        testdir.makepyfile("""
+            import warnings, py
+            def test_func(request):
+                {warn_code}
+        """.format(warn_code=warn_code))
+        result = testdir.runpytest(n)
+        result.stdout.fnmatch_lines([
+            "*this is a warning*",
+            "*1 passed, 1 warnings*",
+        ])
+
+
 def test_teardownfails_one_function(testdir):
     p = testdir.makepyfile("""
         def test_func():
@@ -343,10 +384,9 @@ def test_teardownfails_one_function(testdir):
             assert 0
     """)
     result = testdir.runpytest(p, '-n1', '--tx=popen')
-    result.stdout.fnmatch_lines([
-        "*def teardown_function(function):*",
-        "*1 passed*1 error*"
-    ])
+    result.stdout.fnmatch_lines(
+        ["*def teardown_function(function):*", "*1 passed*1 error*"])
+
 
 @py.test.mark.xfail
 def test_terminate_on_hangingnode(testdir):
@@ -397,9 +437,36 @@ def test_session_hooks(testdir):
     assert testdir.tmpdir.join("slave").check()
     assert testdir.tmpdir.join("master").check()
 
+
+def test_session_testscollected(testdir):
+    """
+    Make sure master node is updating the session object with the number
+    of tests collected from the slaves.
+    """
+    testdir.makepyfile(test_foo="""
+        import pytest
+        @pytest.mark.parametrize('i', range(3))
+        def test_ok(i):
+            pass
+    """)
+    testdir.makeconftest("""
+        def pytest_sessionfinish(session):
+            collected = getattr(session, 'testscollected', None)
+            with open('testscollected', 'w') as f:
+                f.write('collected = %s' % collected)
+    """)
+    result = testdir.inline_run("-n1")
+    result.assertoutcome(passed=3)
+    collected_file = testdir.tmpdir.join('testscollected')
+    assert collected_file.isfile()
+    assert collected_file.read() == 'collected = 3'
+
+
 def test_funcarg_teardown_failure(testdir):
     p = testdir.makepyfile("""
-        def pytest_funcarg__myarg(request):
+        import pytest
+        @pytest.fixture
+        def myarg(request):
             def teardown(val):
                 raise ValueError(val)
             return request.cached_setup(setup=lambda: 42, teardown=teardown,
@@ -407,29 +474,70 @@ def test_funcarg_teardown_failure(testdir):
         def test_hello(myarg):
             pass
     """)
-    result = testdir.runpytest_subprocess("--debug", p) # , "-n1")
+    result = testdir.runpytest_subprocess("--debug", p)  # , "-n1")
     result.stdout.fnmatch_lines([
         "*ValueError*42*",
         "*1 passed*1 error*",
     ])
     assert result.ret
 
-def test_crashing_item(testdir):
+
+@pytest.mark.parametrize('when', ['setup', 'call', 'teardown'])
+def test_crashing_item(testdir, when):
+    """Ensure crashing item is correctly reported during all testing stages"""
+    code = dict(setup='', call='', teardown='')
+    code[when] = 'py.process.kill(os.getpid())'
     p = testdir.makepyfile("""
-        import py
         import os
-        def test_crash():
-            py.process.kill(os.getpid())
-        def test_noncrash():
+        import py
+        import pytest
+
+        @pytest.fixture
+        def fix():
+            {setup}
+            yield
+            {teardown}
+
+        def test_crash(fix):
+            {call}
             pass
-    """)
+
+        def test_ok():
+            pass
+    """.format(**code))
+    passes = 2 if when == 'teardown' else 1
     result = testdir.runpytest("-n2", p)
     result.stdout.fnmatch_lines([
         "*crashed*test_crash*",
-        "*1 failed*1 passed*"
+        "*1 failed*%d passed*" % passes,
     ])
 
 
+def test_multiple_log_reports(testdir):
+    """
+    Ensure that pytest-xdist supports plugins that emit multiple logreports
+    (#206).
+    Inspired by pytest-rerunfailures.
+    """
+    testdir.makeconftest("""
+        from _pytest.runner import runtestprotocol
+        def pytest_runtest_protocol(item, nextitem):
+            item.ihook.pytest_runtest_logstart(nodeid=item.nodeid,
+                                               location=item.location)
+            reports = runtestprotocol(item, nextitem=nextitem)
+            for report in reports:
+                item.ihook.pytest_runtest_logreport(report=report)
+            return True
+    """)
+    testdir.makepyfile("""
+        def test():
+            pass
+    """)
+    result = testdir.runpytest("-n1")
+    result.stdout.fnmatch_lines([
+        "*2 passed*",
+    ])
+
 
 def test_skipping(testdir):
     p = testdir.makepyfile("""
@@ -439,13 +547,12 @@ def test_skipping(testdir):
     """)
     result = testdir.runpytest("-n1", '-rs', p)
     assert result.ret == 0
-    result.stdout.fnmatch_lines([
-        "*hello*",
-        "*1 skipped*"
-    ])
+    result.stdout.fnmatch_lines(["*hello*", "*1 skipped*"])
+
 
 def test_issue34_pluginloading_in_subprocess(testdir):
-    testdir.tmpdir.join("plugin123.py").write(py.code.Source("""
+    testdir.tmpdir.join("plugin123.py").write(
+        py.code.Source("""
         def pytest_namespace():
             return {'sample_variable': 'testing'}
     """))
@@ -467,7 +574,8 @@ def test_fixture_scope_caching_issue503(testdir):
 
             @pytest.fixture(scope='session')
             def fix():
-                assert fix.counter == 0, 'session fixture was invoked multiple times'
+                assert fix.counter == 0, \
+                    'session fixture was invoked multiple times'
                 fix.counter += 1
             fix.counter = 0
 
@@ -480,7 +588,7 @@ def test_fixture_scope_caching_issue503(testdir):
     result = testdir.runpytest(p1, '-v', '-n1')
     assert result.ret == 0
     result.stdout.fnmatch_lines([
-    "*2 passed*",
+        "*2 passed*",
     ])
 
 
@@ -506,8 +614,32 @@ def test_issue_594_random_parametrize(testdir):
     ])
 
 
-class TestNodeFailure:
+def test_tmpdir_disabled(testdir):
+    """Test xdist doesn't break if internal tmpdir plugin is disabled (#22).
+    """
+    p1 = testdir.makepyfile("""
+        def test_ok():
+            pass
+    """)
+    result = testdir.runpytest(p1, "-n1", '-p', 'no:tmpdir')
+    assert result.ret == 0
+    result.stdout.fnmatch_lines("*1 passed*")
 
+
+@pytest.mark.parametrize('plugin', ['xdist.looponfail', 'xdist.boxed'])
+def test_sub_plugins_disabled(testdir, plugin):
+    """Test that xdist doesn't break if we disable any of its sub-plugins. (#32)
+    """
+    p1 = testdir.makepyfile("""
+        def test_ok():
+            pass
+    """)
+    result = testdir.runpytest(p1, "-n1", '-p', 'no:%s' % plugin)
+    assert result.ret == 0
+    result.stdout.fnmatch_lines("*1 passed*")
+
+
+class TestNodeFailure:
     def test_load_single(self, testdir):
         f = testdir.makepyfile("""
             import os
@@ -516,7 +648,7 @@ class TestNodeFailure:
         """)
         res = testdir.runpytest(f, '-n1')
         res.stdout.fnmatch_lines([
-            "*Replacing failed node*",
+            "*Replacing crashed slave*",
             "*Slave*crashed while running*",
             "*1 failed*1 passed*",
         ])
@@ -531,7 +663,7 @@ class TestNodeFailure:
         """)
         res = testdir.runpytest(f, '-n2')
         res.stdout.fnmatch_lines([
-            "*Replacing failed node*",
+            "*Replacing crashed slave*",
             "*Slave*crashed while running*",
             "*1 failed*3 passed*",
         ])
@@ -544,11 +676,12 @@ class TestNodeFailure:
         """)
         res = testdir.runpytest(f, '--dist=each', '--tx=popen')
         res.stdout.fnmatch_lines([
-            "*Replacing failed node*",
+            "*Replacing crashed slave*",
             "*Slave*crashed while running*",
             "*1 failed*1 passed*",
         ])
 
+    @pytest.mark.xfail(reason='#20: xdist race condition on node restart')
     def test_each_multiple(self, testdir):
         f = testdir.makepyfile("""
             import os
@@ -557,7 +690,248 @@ class TestNodeFailure:
         """)
         res = testdir.runpytest(f, '--dist=each', '--tx=2*popen')
         res.stdout.fnmatch_lines([
-            "*Replacing failed node*",
+            "*Replacing crashed slave*",
             "*Slave*crashed while running*",
             "*2 failed*2 passed*",
         ])
+
+    def test_max_slave_restart(self, testdir):
+        f = testdir.makepyfile("""
+            import os
+            def test_a(): pass
+            def test_b(): os._exit(1)
+            def test_c(): os._exit(1)
+            def test_d(): pass
+        """)
+        res = testdir.runpytest(f, '-n4', '--max-slave-restart=1')
+        res.stdout.fnmatch_lines([
+            "*Replacing crashed slave*",
+            "*Maximum crashed slaves reached: 1*",
+            "*Slave*crashed while running*",
+            "*Slave*crashed while running*",
+            "*2 failed*2 passed*",
+        ])
+
+    def test_max_slave_restart_die(self, testdir):
+        f = testdir.makepyfile("""
+            import os
+            os._exit(1)
+        """)
+        res = testdir.runpytest(f, '-n4', '--max-slave-restart=0')
+        res.stdout.fnmatch_lines([
+            "*Unexpectedly no active workers*",
+            "*INTERNALERROR*"
+        ])
+
+    def test_disable_restart(self, testdir):
+        f = testdir.makepyfile("""
+            import os
+            def test_a(): pass
+            def test_b(): os._exit(1)
+            def test_c(): pass
+        """)
+        res = testdir.runpytest(f, '-n4', '--max-slave-restart=0')
+        res.stdout.fnmatch_lines([
+            "*Slave restarting disabled*",
+            "*Slave*crashed while running*",
+            "*1 failed*2 passed*",
+        ])
+
+
+@pytest.mark.parametrize('n', [0, 2])
+def test_worker_id_fixture(testdir, n):
+    import glob
+    f = testdir.makepyfile("""
+        import pytest
+        @pytest.mark.parametrize("run_num", range(2))
+        def test_worker_id1(worker_id, run_num):
+            with open("worker_id%s.txt" % run_num, "w") as f:
+                f.write(worker_id)
+    """)
+    result = testdir.runpytest(f, "-n%d" % n)
+    result.stdout.fnmatch_lines('* 2 passed in *')
+    worker_ids = set()
+    for fname in glob.glob(str(testdir.tmpdir.join("*.txt"))):
+        with open(fname) as f:
+            worker_ids.add(f.read().strip())
+    if n == 0:
+        assert worker_ids == {'master'}
+    else:
+        assert worker_ids == {'gw0', 'gw1'}
+
+
+@pytest.mark.parametrize('tb',
+                         ['auto', 'long', 'short', 'no', 'line', 'native'])
+def test_error_report_styles(testdir, tb):
+    testdir.makepyfile("""
+        import pytest
+        def test_error_report_styles():
+            raise RuntimeError('some failure happened')
+    """)
+    result = testdir.runpytest('-n1', '--tb=%s' % tb)
+    if tb != 'no':
+        result.stdout.fnmatch_lines('*some failure happened*')
+    result.assert_outcomes(failed=1)
+
+
+def test_color_yes_collection_on_non_atty(testdir, request):
+    """skip collect progress report when working on non-terminals.
+
+    Similar to pytest-dev/pytest#1397
+    """
+    tr = request.config.pluginmanager.getplugin("terminalreporter")
+    if not hasattr(tr, 'isatty'):
+        pytest.skip('only valid for newer pytest versions')
+    testdir.makepyfile("""
+        import pytest
+        @pytest.mark.parametrize('i', range(10))
+        def test_this(i):
+            assert 1
+    """)
+    args = ['--color=yes', '-n2']
+    result = testdir.runpytest(*args)
+    assert 'test session starts' in result.stdout.str()
+    assert '\x1b[1m' in result.stdout.str()
+    assert 'gw0 [10] / gw1 [10]' in result.stdout.str()
+    assert 'gw0 C / gw1 C' not in result.stdout.str()
+
+
+def test_internal_error_with_maxfail(testdir):
+    """
+    Internal error when using --maxfail option (#62, #65).
+    """
+    testdir.makepyfile("""
+        import pytest
+
+        @pytest.fixture(params=['1', '2'])
+        def crasher():
+            raise RuntimeError
+
+        def test_aaa0(crasher):
+            pass
+        def test_aaa1(crasher):
+            pass
+    """)
+    result = testdir.runpytest_subprocess('--maxfail=1', '-n1')
+    result.stdout.fnmatch_lines(['* 1 error in *'])
+    assert 'INTERNALERROR' not in result.stderr.str()
+
+
+class TestLoadScope:
+
+    def test_by_module(self, testdir):
+        test_file = """
+            import pytest
+            @pytest.mark.parametrize('i', range(10))
+            def test(i):
+                pass
+        """
+        testdir.makepyfile(
+            test_a=test_file,
+            test_b=test_file,
+        )
+        result = testdir.runpytest('-n2', '--dist=loadscope', '-v')
+        assert get_workers_and_test_count_by_prefix(
+            'test_a.py::test', result.outlines) in ({'gw0': 10}, {'gw1': 10})
+        assert get_workers_and_test_count_by_prefix(
+            'test_b.py::test', result.outlines) in ({'gw0': 10}, {'gw1': 10})
+
+    def test_by_class(self, testdir):
+        testdir.makepyfile(test_a="""
+            import pytest
+            class TestA:
+                @pytest.mark.parametrize('i', range(10))
+                def test(self, i):
+                    pass
+
+            class TestB:
+                @pytest.mark.parametrize('i', range(10))
+                def test(self, i):
+                    pass
+        """)
+        result = testdir.runpytest('-n2', '--dist=loadscope', '-v')
+        assert get_workers_and_test_count_by_prefix(
+            'test_a.py::TestA', result.outlines) in ({'gw0': 10}, {'gw1': 10})
+        assert get_workers_and_test_count_by_prefix(
+            'test_a.py::TestB', result.outlines) in ({'gw0': 10}, {'gw1': 10})
+
+
+class TestFileScope:
+
+    def test_by_module(self, testdir):
+        test_file = """
+            import pytest
+            class TestA:
+                @pytest.mark.parametrize('i', range(10))
+                def test(self, i):
+                    pass
+
+            class TestB:
+                @pytest.mark.parametrize('i', range(10))
+                def test(self, i):
+                    pass
+        """
+        testdir.makepyfile(
+            test_a=test_file,
+            test_b=test_file,
+        )
+        result = testdir.runpytest('-n2', '--dist=loadfile', '-v')
+        test_a_workers_and_test_count = get_workers_and_test_count_by_prefix(
+            'test_a.py::TestA', result.outlines)
+        test_b_workers_and_test_count = get_workers_and_test_count_by_prefix(
+            'test_b.py::TestB', result.outlines)
+
+        assert test_a_workers_and_test_count in ({'gw0': 10}, {'gw1': 0}) or \
+            test_a_workers_and_test_count in ({'gw0': 0}, {'gw1': 10})
+        assert test_b_workers_and_test_count in ({'gw0': 10}, {'gw1': 0}) or \
+            test_b_workers_and_test_count in ({'gw0': 0}, {'gw1': 10})
+
+    def test_by_class(self, testdir):
+        testdir.makepyfile(test_a="""
+            import pytest
+            class TestA:
+                @pytest.mark.parametrize('i', range(10))
+                def test(self, i):
+                    pass
+
+            class TestB:
+                @pytest.mark.parametrize('i', range(10))
+                def test(self, i):
+                    pass
+        """)
+        result = testdir.runpytest('-n2', '--dist=loadfile', '-v')
+        test_a_workers_and_test_count = get_workers_and_test_count_by_prefix(
+            'test_a.py::TestA', result.outlines)
+        test_b_workers_and_test_count = get_workers_and_test_count_by_prefix(
+            'test_a.py::TestB', result.outlines)
+
+        assert test_a_workers_and_test_count in ({'gw0': 10}, {'gw1': 0}) or \
+            test_a_workers_and_test_count in ({'gw0': 0}, {'gw1': 10})
+        assert test_b_workers_and_test_count in ({'gw0': 10}, {'gw1': 0}) or \
+            test_b_workers_and_test_count in ({'gw0': 0}, {'gw1': 10})
+
+
+def parse_tests_and_workers_from_output(lines):
+    result = []
+    for line in lines:
+        # example match: "[gw0] PASSED test_a.py::test[7]"
+        m = re.match(r'''
+            \[(gw\d)\]  # worker
+            \s*
+            (?:\[\s*\d+%\])? # progress indicator (pytest >=3.3)
+            \s(.*?)     # status string ("PASSED")
+            \s(.*::.*)  # nodeid
+        ''', line.strip(), re.VERBOSE)
+        if m:
+            worker, status, nodeid = m.groups()
+            result.append((worker, status, nodeid))
+    return result
+
+
+def get_workers_and_test_count_by_prefix(prefix, lines,
+                                         expected_status='PASSED'):
+    result = {}
+    for worker, status, nodeid in parse_tests_and_workers_from_output(lines):
+        if expected_status == status and nodeid.startswith(prefix):
+            result[worker] = result.get(worker, 0) + 1
+    return result

testing/conftest.py

@@ -2,6 +2,7 @@ import py
 import pytest
 import execnet
 
+
 @pytest.fixture(scope="session", autouse=True)
 def _ensure_imports():
     # we import some modules because pytest-2.8's testdir fixture
@@ -10,28 +11,37 @@ def _ensure_imports():
     execnet.Group
     execnet.makegateway
 
+
 pytest_plugins = "pytester"
 
-#rsyncdirs = ['.', '../xdist', py.path.local(execnet.__file__).dirpath()]
+# rsyncdirs = ['.', '../xdist', py.path.local(execnet.__file__).dirpath()]
+
 
 @pytest.fixture(autouse=True)
 def _divert_atexit(request, monkeypatch):
     import atexit
-    l = []
+    finalizers = []
+
     def finish():
-        while l:
-            l.pop()()
-    monkeypatch.setattr(atexit, "register", l.append)
+        while finalizers:
+            finalizers.pop()()
+
+    monkeypatch.setattr(atexit, "register", finalizers.append)
     request.addfinalizer(finish)
 
+
 def pytest_addoption(parser):
     parser.addoption('--gx',
-       action="append", dest="gspecs",
-       help=("add a global test environment, XSpec-syntax. "))
+                     action="append",
+                     dest="gspecs",
+                     help="add a global test environment, XSpec-syntax. ")
 
-def pytest_funcarg__specssh(request):
+
+@pytest.fixture
+def specssh(request):
     return getspecssh(request.config)
 
+
 @pytest.fixture
 def testdir(testdir):
     # pytest before 2.8 did not have a runpytest_subprocess
@@ -39,10 +49,11 @@ def testdir(testdir):
         testdir.runpytest_subprocess = testdir.runpytest
     return testdir
 
+
 # configuration information for tests
 def getgspecs(config):
-    return [execnet.XSpec(spec)
-                for spec in config.getvalueorskip("gspecs")]
+    return [execnet.XSpec(spec) for spec in config.getvalueorskip("gspecs")]
+
 
 def getspecssh(config):
     xspecs = getgspecs(config)
@@ -53,10 +64,10 @@ def getspecssh(config):
             return str(spec)
     py.test.skip("need '--gx ssh=...'")
 
+
 def getsocketspec(config):
     xspecs = getgspecs(config)
     for spec in xspecs:
         if spec.socket:
             return spec
     py.test.skip("need '--gx socket=...'")
-

testing/test_boxed.py

@@ -1,56 +0,0 @@
-import pytest
-import os
-
-needsfork = pytest.mark.skipif(not hasattr(os, "fork"),
-                               reason="os.fork required")
-
-@needsfork
-def test_functional_boxed(testdir):
-    p1 = testdir.makepyfile("""
-        import os
-        def test_function():
-            os.kill(os.getpid(), 15)
-    """)
-    result = testdir.runpytest(p1, "--boxed")
-    result.stdout.fnmatch_lines([
-        "*CRASHED*",
-        "*1 failed*"
-    ])
-
-@needsfork
-@pytest.mark.parametrize("capmode", [
-    "no",
-    pytest.mark.xfail("sys", reason="capture cleanup needed"),
-    pytest.mark.xfail("fd", reason="capture cleanup needed")])
-def test_functional_boxed_capturing(testdir, capmode):
-    p1 = testdir.makepyfile("""
-        import os
-        import sys
-        def test_function():
-            sys.stdout.write("hello\\n")
-            sys.stderr.write("world\\n")
-            os.kill(os.getpid(), 15)
-    """)
-    result = testdir.runpytest(p1, "--boxed", "--capture=%s" % capmode)
-    result.stdout.fnmatch_lines("""
-        *CRASHED*
-        *stdout*
-        hello
-        *stderr*
-        world
-        *1 failed*
-    """)
-
-class TestOptionEffects:
-    def test_boxed_option_default(self, testdir):
-        tmpdir = testdir.tmpdir.ensure("subdir", dir=1)
-        config = testdir.parseconfig()
-        assert not config.option.boxed
-        pytest.importorskip("execnet")
-        config = testdir.parseconfig('-d', tmpdir)
-        assert not config.option.boxed
-
-    def test_is_not_boxed_by_default(self, testdir):
-        config = testdir.parseconfig(testdir.tmpdir)
-        assert not config.option.boxed
-

testing/test_dsession.py

@@ -1,32 +1,37 @@
-from xdist.dsession import (
-    DSession,
-    LoadScheduling,
+from xdist.dsession import DSession
+from xdist.report import report_collection_diff
+from xdist.scheduler import (
     EachScheduling,
-    report_collection_diff,
+    LoadScheduling,
 )
+
 import py
 import pytest
 import execnet
 
 XSpec = execnet.XSpec
 
+
 def run(item, node, excinfo=None):
     runner = item.config.pluginmanager.getplugin("runner")
-    rep = runner.ItemTestReport(item=item,
-        excinfo=excinfo, when="call")
+    rep = runner.ItemTestReport(item=item, excinfo=excinfo, when="call")
     rep.node = node
     return rep
 
+
 class MockGateway:
     _count = 0
+
     def __init__(self):
         self.id = str(self._count)
         self._count += 1
 
+
 class MockNode:
     def __init__(self):
         self.sent = []
         self.gateway = MockGateway()
+        self._shutdown = False
 
     def send_runtest_some(self, indices):
         self.sent.extend(indices)
@@ -35,111 +40,162 @@ class MockNode:
         self.sent.append("ALL")
 
     def shutdown(self):
-        self._shutdown=True
+        self._shutdown = True
+
+    @property
+    def shutting_down(self):
+        return self._shutdown
+
 
 def dumpqueue(queue):
     while queue.qsize():
         print(queue.get())
 
+
 class TestEachScheduling:
-    def test_schedule_load_simple(self):
+    def test_schedule_load_simple(self, testdir):
         node1 = MockNode()
         node2 = MockNode()
-        sched = EachScheduling(2)
-        sched.addnode(node1)
-        sched.addnode(node2)
+        config = testdir.parseconfig("--tx=2*popen")
+        sched = EachScheduling(config)
+        sched.add_node(node1)
+        sched.add_node(node2)
         collection = ["a.py::test_1", ]
         assert not sched.collection_is_completed
-        sched.addnode_collection(node1, collection)
+        sched.add_node_collection(node1, collection)
         assert not sched.collection_is_completed
-        sched.addnode_collection(node2, collection)
+        sched.add_node_collection(node2, collection)
         assert sched.collection_is_completed
         assert sched.node2collection[node1] == collection
         assert sched.node2collection[node2] == collection
-        sched.init_distribute()
-        assert sched.tests_finished()
+        sched.schedule()
+        assert sched.tests_finished
         assert node1.sent == ['ALL']
         assert node2.sent == ['ALL']
-        sched.remove_item(node1, 0)
-        assert sched.tests_finished()
-        sched.remove_item(node2, 0)
-        assert sched.tests_finished()
+        sched.mark_test_complete(node1, 0)
+        assert sched.tests_finished
+        sched.mark_test_complete(node2, 0)
+        assert sched.tests_finished
 
-    def test_schedule_remove_node(self):
+    def test_schedule_remove_node(self, testdir):
         node1 = MockNode()
-        sched = EachScheduling(1)
-        sched.addnode(node1)
+        config = testdir.parseconfig("--tx=popen")
+        sched = EachScheduling(config)
+        sched.add_node(node1)
         collection = ["a.py::test_1", ]
         assert not sched.collection_is_completed
-        sched.addnode_collection(node1, collection)
+        sched.add_node_collection(node1, collection)
         assert sched.collection_is_completed
         assert sched.node2collection[node1] == collection
-        sched.init_distribute()
-        assert sched.tests_finished()
+        sched.schedule()
+        assert sched.tests_finished
         crashitem = sched.remove_node(node1)
         assert crashitem
-        assert sched.tests_finished()
-        assert not sched.hasnodes()
+        assert sched.tests_finished
+        assert not sched.nodes
+
 
 class TestLoadScheduling:
-    def test_schedule_load_simple(self):
-        sched = LoadScheduling(2)
-        sched.addnode(MockNode())
-        sched.addnode(MockNode())
+    def test_schedule_load_simple(self, testdir):
+        config = testdir.parseconfig("--tx=2*popen")
+        sched = LoadScheduling(config)
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
         node1, node2 = sched.nodes
         collection = ["a.py::test_1", "a.py::test_2"]
         assert not sched.collection_is_completed
-        sched.addnode_collection(node1, collection)
+        sched.add_node_collection(node1, collection)
         assert not sched.collection_is_completed
-        sched.addnode_collection(node2, collection)
+        sched.add_node_collection(node2, collection)
         assert sched.collection_is_completed
         assert sched.node2collection[node1] == collection
         assert sched.node2collection[node2] == collection
-        sched.init_distribute()
+        sched.schedule()
         assert not sched.pending
-        assert not sched.tests_finished()
-        assert len(node1.sent) == 2
-        assert len(node2.sent) == 0
-        assert node1.sent == [0, 1]
-        sched.remove_item(node1, node1.sent[0])
-        assert sched.tests_finished()
-        sched.remove_item(node1, node1.sent[1])
-        assert sched.tests_finished()
+        assert sched.tests_finished
+        assert len(node1.sent) == 1
+        assert len(node2.sent) == 1
+        assert node1.sent == [0]
+        assert node2.sent == [1]
+        sched.mark_test_complete(node1, node1.sent[0])
+        assert sched.tests_finished
 
-    def test_init_distribute_chunksize(self):
-        sched = LoadScheduling(2)
-        sched.addnode(MockNode())
-        sched.addnode(MockNode())
+    def test_schedule_batch_size(self, testdir):
+        config = testdir.parseconfig("--tx=2*popen")
+        sched = LoadScheduling(config)
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
         node1, node2 = sched.nodes
-        col = ["xyz"] * (6)
-        sched.addnode_collection(node1, col)
-        sched.addnode_collection(node2, col)
-        sched.init_distribute()
-        #assert not sched.tests_finished()
+        col = ["xyz"] * 6
+        sched.add_node_collection(node1, col)
+        sched.add_node_collection(node2, col)
+        sched.schedule()
+        # assert not sched.tests_finished
         sent1 = node1.sent
         sent2 = node2.sent
-        assert sent1 == [0, 1]
-        assert sent2 == [2, 3]
+        assert sent1 == [0, 2]
+        assert sent2 == [1, 3]
         assert sched.pending == [4, 5]
         assert sched.node2pending[node1] == sent1
         assert sched.node2pending[node2] == sent2
         assert len(sched.pending) == 2
-        sched.remove_item(node1, 0)
-        assert node1.sent == [0, 1, 4]
+        sched.mark_test_complete(node1, 0)
+        assert node1.sent == [0, 2, 4]
         assert sched.pending == [5]
-        assert node2.sent == [2, 3]
-        sched.remove_item(node1, 1)
-        assert node1.sent == [0, 1, 4, 5]
+        assert node2.sent == [1, 3]
+        sched.mark_test_complete(node1, 2)
+        assert node1.sent == [0, 2, 4, 5]
         assert not sched.pending
 
-    def test_add_remove_node(self):
+    def test_schedule_fewer_tests_than_nodes(self, testdir):
+        config = testdir.parseconfig("--tx=2*popen")
+        sched = LoadScheduling(config)
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
+        node1, node2, node3 = sched.nodes
+        col = ["xyz"] * 2
+        sched.add_node_collection(node1, col)
+        sched.add_node_collection(node2, col)
+        sched.schedule()
+        # assert not sched.tests_finished
+        sent1 = node1.sent
+        sent2 = node2.sent
+        sent3 = node3.sent
+        assert sent1 == [0]
+        assert sent2 == [1]
+        assert sent3 == []
+        assert not sched.pending
+
+    def test_schedule_fewer_than_two_tests_per_node(self, testdir):
+        config = testdir.parseconfig("--tx=2*popen")
+        sched = LoadScheduling(config)
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
+        node1, node2, node3 = sched.nodes
+        col = ["xyz"] * 5
+        sched.add_node_collection(node1, col)
+        sched.add_node_collection(node2, col)
+        sched.schedule()
+        # assert not sched.tests_finished
+        sent1 = node1.sent
+        sent2 = node2.sent
+        sent3 = node3.sent
+        assert sent1 == [0, 3]
+        assert sent2 == [1, 4]
+        assert sent3 == [2]
+        assert not sched.pending
+
+    def test_add_remove_node(self, testdir):
         node = MockNode()
-        sched = LoadScheduling(1)
-        sched.addnode(node)
+        config = testdir.parseconfig("--tx=popen")
+        sched = LoadScheduling(config)
+        sched.add_node(node)
         collection = ["test_file.py::test_func"]
-        sched.addnode_collection(node, collection)
+        sched.add_node_collection(node, collection)
         assert sched.collection_is_completed
-        sched.init_distribute()
+        sched.schedule()
         assert not sched.pending
         crashitem = sched.remove_node(node)
         assert crashitem == collection[0]
@@ -149,6 +205,7 @@ class TestLoadScheduling:
         Test that LoadScheduling is reporting collection errors when
         different test ids are collected by slaves.
         """
+
         class CollectHook(object):
             """
             Dummy hook that stores collection reports.
@@ -161,23 +218,22 @@ class TestLoadScheduling:
                 self.reports.append(report)
 
         collect_hook = CollectHook()
-        config = testdir.parseconfig()
+        config = testdir.parseconfig("--tx=2*popen")
         config.pluginmanager.register(collect_hook, "collect_hook")
         node1 = MockNode()
         node2 = MockNode()
-        sched = LoadScheduling(2, config=config)
-        sched.addnode(node1)
-        sched.addnode(node2)
-        sched.addnode_collection(node1, ["a.py::test_1"])
-        sched.addnode_collection(node2, ["a.py::test_2"])
-        sched.init_distribute()
+        sched = LoadScheduling(config)
+        sched.add_node(node1)
+        sched.add_node(node2)
+        sched.add_node_collection(node1, ["a.py::test_1"])
+        sched.add_node_collection(node2, ["a.py::test_2"])
+        sched.schedule()
         assert len(collect_hook.reports) == 1
         rep = collect_hook.reports[0]
         assert 'Different tests were collected between' in rep.longrepr
 
 
 class TestDistReporter:
-
     @py.test.mark.xfail
     def test_rsync_printing(self, testdir, linecomp):
         config = testdir.parseconfig()
@@ -185,26 +241,26 @@ class TestDistReporter:
         rep = TerminalReporter(config, file=linecomp.stringio)
         config.pluginmanager.register(rep, "terminalreporter")
         dsession = DSession(config)
+
         class gw1:
             id = "X1"
             spec = execnet.XSpec("popen")
+
         class gw2:
             id = "X2"
             spec = execnet.XSpec("popen")
-        #class rinfo:
+        # class rinfo:
         #    version_info = (2, 5, 1, 'final', 0)
         #    executable = "hello"
         #    platform = "xyz"
         #    cwd = "qwe"
 
-        #dsession.pytest_xdist_newgateway(gw1, rinfo)
-        #linecomp.assert_contains_lines([
-        #    "*X1*popen*xyz*2.5*"
-        #])
+        # dsession.pytest_xdist_newgateway(gw1, rinfo)
+        # linecomp.assert_contains_lines([
+        #     "*X1*popen*xyz*2.5*"
+        # ])
         dsession.pytest_xdist_rsyncstart(source="hello", gateways=[gw1, gw2])
-        linecomp.assert_contains_lines([
-            "[X1,X2] rsyncing: hello",
-        ])
+        linecomp.assert_contains_lines(["[X1,X2] rsyncing: hello", ])
 
 
 def test_report_collection_diff_equal():
@@ -230,12 +286,12 @@ def test_report_collection_diff_different():
         ' bbb\n'
         '+XXX\n'
         ' ccc\n'
-        '-YYY'
-    )
+        '-YYY')
 
-    msg = report_collection_diff(from_collection, to_collection, 1, 2)
+    msg = report_collection_diff(from_collection, to_collection, '1', '2')
     assert msg == error_message
 
+
 @pytest.mark.xfail(reason="duplicate test ids not supported yet")
 def test_pytest_issue419(testdir):
     testdir.makepyfile("""

testing/test_looponfail.py

@@ -2,6 +2,7 @@ import py
 from xdist.looponfail import RemoteControl
 from xdist.looponfail import StatRecorder
 
+
 class TestStatRecorder:
     def test_filechange(self, tmpdir):
         tmp = tmpdir
@@ -82,10 +83,11 @@ class TestStatRecorder:
         tmp = tmpdir
         sd = StatRecorder([tmp])
 
-        l = [True, False]
-        monkeypatch.setattr(StatRecorder, 'check', lambda self: l.pop())
+        ret_values = [True, False]
+        monkeypatch.setattr(StatRecorder, 'check', lambda self: ret_values.pop())
         sd.waitonchange(checkinterval=0.2)
-        assert not l
+        assert not ret_values
+
 
 class TestRemoteControl:
     def test_nofailures(self, testdir):
@@ -136,13 +138,14 @@ class TestRemoteControl:
         parent = modcol.fspath.dirpath().dirpath()
         parent.chdir()
         modcol.config.args = [py.path.local(x).relto(parent)
-                                for x in modcol.config.args]
+                              for x in modcol.config.args]
         control = RemoteControl(modcol.config)
         control.loop_once()
         assert control.failures
         control.loop_once()
         assert control.failures
 
+
 class TestLooponFailing:
     def test_looponfail_from_fail_to_ok(self, testdir):
         modcol = testdir.getmodulecol("""
@@ -190,6 +193,8 @@ class TestLooponFailing:
         assert 'test_one' not in remotecontrol.failures[0]
         assert 'test_two' in remotecontrol.failures[0]
 
+    @py.test.mark.xfail(py.test.__version__ >= "3.1",
+                        reason="broken by pytest 3.1+")
     def test_looponfail_removed_test(self, testdir):
         modcol = testdir.getmodulecol("""
             def test_one():
@@ -225,7 +230,7 @@ class TestLooponFailing:
         def runsession_dups():
             # twisted.trial test cases may report multiple errors.
             failures, reports, collection_failed = orig_runsession()
-            print (failures)
+            print(failures)
             return failures * 2, reports, collection_failed
 
         monkeypatch.setattr(remotecontrol, 'runsession', runsession_dups)
@@ -240,8 +245,8 @@ class TestFunctional:
                 x = 0
                 assert x == 1
         """)
-        #p = testdir.mkdir("sub").join(p1.basename)
-        #p1.move(p)
+        # p = testdir.mkdir("sub").join(p1.basename)
+        # p1.move(p)
         child = testdir.spawn_pytest("-f %s --traceconfig" % p)
         child.expect("def test_one")
         child.expect("x == 1")
@@ -265,10 +270,11 @@ class TestFunctional:
         """)
         child = testdir.spawn_pytest("-f %s" % p)
         child.expect("1 xpass")
-        child.expect("### LOOPONFAILING ####")
+        # child.expect("### LOOPONFAILING ####")
         child.expect("waiting for changes")
         child.kill(15)
 
+
 def removepyc(path):
     # XXX damn those pyc files
     pyc = path + "c"
@@ -277,4 +283,3 @@ def removepyc(path):
     c = path.dirpath("__pycache__")
     if c.check():
         c.remove()
-

testing/test_newhooks.py

@@ -0,0 +1,55 @@
+import pytest
+
+
+class TestHooks:
+
+    @pytest.fixture(autouse=True)
+    def create_test_file(self, testdir):
+        testdir.makepyfile("""
+            import os
+            def test_a(): pass
+            def test_b(): pass
+            def test_c(): pass
+        """)
+
+    def test_runtest_logreport(self, testdir):
+        """Test that log reports from pytest_runtest_logreport when running
+        with xdist contain "node", "nodeid" and "worker_id" attributes. (#8)
+        """
+        testdir.makeconftest("""
+            def pytest_runtest_logreport(report):
+                if hasattr(report, 'node'):
+                    if report.when == "call":
+                        slaveid = report.node.slaveinput['slaveid']
+                        if slaveid != report.worker_id:
+                            print("HOOK: Worker id mismatch: %s %s"
+                                   % (slaveid, report.worker_id))
+                        else:
+                            print("HOOK: %s %s"
+                                   % (report.nodeid, report.worker_id))
+        """)
+        res = testdir.runpytest('-n1', '-s')
+        res.stdout.fnmatch_lines([
+            '*HOOK: test_runtest_logreport.py::test_a gw0*',
+            '*HOOK: test_runtest_logreport.py::test_b gw0*',
+            '*HOOK: test_runtest_logreport.py::test_c gw0*',
+            '*3 passed*',
+        ])
+
+    def test_node_collection_finished(self, testdir):
+        """Test pytest_xdist_node_collection_finished hook (#8).
+        """
+        testdir.makeconftest("""
+            def pytest_xdist_node_collection_finished(node, ids):
+                slaveid = node.slaveinput['slaveid']
+                stripped_ids = [x.split('::')[1] for x in ids]
+                print("HOOK: %s %s" % (slaveid, ', '.join(stripped_ids)))
+        """)
+        res = testdir.runpytest('-n2', '-s')
+        res.stdout.fnmatch_lines_random([
+            '*HOOK: gw0 test_a, test_b, test_c',
+            '*HOOK: gw1 test_a, test_b, test_c',
+        ])
+        res.stdout.fnmatch_lines([
+            '*3 passed*',
+        ])

testing/test_plugin.py

@@ -2,6 +2,7 @@ import py
 import execnet
 from xdist.slavemanage import NodeManager
 
+
 def test_dist_incompatibility_messages(testdir):
     result = testdir.runpytest("--pdb", "--looponfail")
     assert result.ret != 0
@@ -12,16 +13,67 @@ def test_dist_incompatibility_messages(testdir):
     assert result.ret != 0
     assert "incompatible" in result.stderr.str()
 
+
 def test_dist_options(testdir):
-    from xdist.plugin import check_options
+    from xdist.plugin import pytest_cmdline_main as check_options
     config = testdir.parseconfigure("-n 2")
     check_options(config)
     assert config.option.dist == "load"
     assert config.option.tx == ['popen'] * 2
+    config = testdir.parseconfigure("--numprocesses", "2")
+    check_options(config)
+    assert config.option.dist == "load"
+    assert config.option.tx == ['popen'] * 2
     config = testdir.parseconfigure("-d")
     check_options(config)
     assert config.option.dist == "load"
 
+
+def test_auto_detect_cpus(testdir, monkeypatch):
+    import os
+    if hasattr(os, 'cpu_count'):
+        monkeypatch.setattr(os, 'cpu_count', lambda: 99)
+    else:
+        import multiprocessing
+        monkeypatch.setattr(multiprocessing, 'cpu_count', lambda: 99)
+
+    config = testdir.parseconfigure("-n2")
+    assert config.getoption('numprocesses') == 2
+
+    config = testdir.parseconfigure("-nauto")
+    assert config.getoption('numprocesses') == 99
+
+
+def test_boxed_with_collect_only(testdir):
+    from xdist.plugin import pytest_cmdline_main as check_options
+    config = testdir.parseconfigure("-n1", "--boxed")
+    check_options(config)
+    assert config.option.forked
+
+    config = testdir.parseconfigure("-n1", "--collect-only")
+    check_options(config)
+    assert not config.option.forked
+
+    config = testdir.parseconfigure("-n1", "--boxed", "--collect-only")
+    check_options(config)
+    assert config.option.forked
+
+
+def test_dsession_with_collect_only(testdir):
+    from xdist.plugin import pytest_cmdline_main as check_options
+    from xdist.plugin import pytest_configure as configure
+
+    config = testdir.parseconfigure("-n1")
+    check_options(config)
+    configure(config)
+    assert config.pluginmanager.hasplugin("dsession")
+
+    config = testdir.parseconfigure("-n1", "--collect-only")
+    check_options(config)
+    configure(config)
+    assert not config.pluginmanager.hasplugin("dsession")
+
+
 class TestDistOptions:
     def test_getxspecs(self, testdir):
         config = testdir.parseconfigure("--tx=popen", "--tx", "ssh=xyz")
@@ -33,7 +85,7 @@ class TestDistOptions:
         assert xspecs[1].ssh == "xyz"
 
     def test_xspecs_multiplied(self, testdir):
-        config = testdir.parseconfigure("--tx=3*popen",)
+        config = testdir.parseconfigure("--tx=3*popen", )
         xspecs = NodeManager(config)._getxspecs()
         assert len(xspecs) == 3
         assert xspecs[1].popen
@@ -60,11 +112,10 @@ class TestDistOptions:
             rsyncdirs= x
         """)
         config = testdir.parseconfigure(
-              testdir.tmpdir, '--rsyncdir=y', '--rsyncdir=z')
+            testdir.tmpdir, '--rsyncdir=y', '--rsyncdir=z')
         nm = NodeManager(config, specs=[execnet.XSpec("popen//chdir=xyz")])
         roots = nm._getrsyncdirs()
-        #assert len(roots) == 3 + 1 # pylib
+        # assert len(roots) == 3 + 1 # pylib
         assert py.path.local('y') in roots
         assert py.path.local('z') in roots
         assert testdir.tmpdir.join('x') in roots
-

testing/test_remote.py

@@ -1,12 +1,15 @@
 import py
+import pytest
 from xdist.slavemanage import SlaveController, unserialize_report
 from xdist.remote import serialize_report
 import execnet
-queue = py.builtin._tryimport("queue", "Queue")
 import marshal
 
+queue = py.builtin._tryimport("queue", "Queue")
+
 WAIT_TIMEOUT = 10.0
 
+
 def check_marshallable(d):
     try:
         marshal.dumps(d)
@@ -14,28 +17,35 @@ def check_marshallable(d):
         py.std.pprint.pprint(d)
         raise ValueError("not marshallable")
 
+
 class EventCall:
     def __init__(self, eventcall):
         self.name, self.kwargs = eventcall
 
     def __str__(self):
-        return "<EventCall %s(**%s)>" %(self.name, self.kwargs)
+        return "<EventCall %s(**%s)>" % (self.name, self.kwargs)
+
 
 class SlaveSetup:
     use_callback = False
 
-    def __init__(self, request):
-        self.testdir = request.getfuncargvalue("testdir")
+    def __init__(self, request, testdir):
         self.request = request
+        self.testdir = testdir
         self.events = queue.Queue()
 
     def setup(self, ):
         self.testdir.chdir()
-        #import os ; os.environ['EXECNET_DEBUG'] = "2"
+        # import os ; os.environ['EXECNET_DEBUG'] = "2"
         self.gateway = execnet.makegateway()
         self.config = config = self.testdir.parseconfigure()
         putevent = self.use_callback and self.events.put or None
-        self.slp = SlaveController(None, self.gateway, config, putevent)
+
+        class DummyMananger:
+            specs = [0, 1]
+
+        self.slp = SlaveController(DummyMananger, self.gateway, config,
+                                   putevent)
         self.request.addfinalizer(self.slp.ensure_teardown)
         self.slp.setup()
 
@@ -48,14 +58,18 @@ class SlaveSetup:
             ev = EventCall(data)
             if name is None or ev.name == name:
                 return ev
-            print("skipping %s" % (ev,))
+            print("skipping %s" % (ev, ))
 
     def sendcommand(self, name, **kwargs):
         self.slp.sendcommand(name, **kwargs)
 
-def pytest_funcarg__slave(request):
-    return SlaveSetup(request)
 
+@pytest.fixture
+def slave(request, testdir):
+    return SlaveSetup(request, testdir)
+
+
+@pytest.mark.xfail(reason='#59')
 def test_remoteinitconfig(testdir):
     from xdist.remote import remote_initconfig
     config1 = testdir.parseconfig()
@@ -63,7 +77,99 @@ def test_remoteinitconfig(testdir):
     assert config2.option.__dict__ == config1.option.__dict__
     assert config2.pluginmanager.getplugin("terminal") in (-1, None)
 
+
 class TestReportSerialization:
+    def test_xdist_longrepr_to_str_issue_241(self, testdir):
+        testdir.makepyfile("""
+            import os
+            def test_a(): assert False
+            def test_b(): pass
+        """)
+        testdir.makeconftest("""
+            def pytest_runtest_logreport(report):
+                print(report.longrepr)
+        """)
+        res = testdir.runpytest('-n1', '-s')
+        res.stdout.fnmatch_lines([
+            '*1 failed, 1 passed *'
+        ])
+
+    def test_xdist_report_longrepr_reprcrash_130(self, testdir):
+        reprec = testdir.inline_runsource("""
+                    import py
+                    def test_fail(): assert False, 'Expected Message'
+                """)
+        reports = reprec.getreports("pytest_runtest_logreport")
+        assert len(reports) == 3
+        rep = reports[1]
+        added_section = ('Failure Metadata', str("metadata metadata"), "*")
+        rep.longrepr.sections.append(added_section)
+        d = serialize_report(rep)
+        check_marshallable(d)
+        a = unserialize_report("testreport", d)
+        # Check assembled == rep
+        assert a.__dict__.keys() == rep.__dict__.keys()
+        for key in rep.__dict__.keys():
+            if key != 'longrepr':
+                assert getattr(a, key) == getattr(rep, key)
+        assert rep.longrepr.reprcrash.lineno == a.longrepr.reprcrash.lineno
+        assert rep.longrepr.reprcrash.message == a.longrepr.reprcrash.message
+        assert rep.longrepr.reprcrash.path == a.longrepr.reprcrash.path
+        assert rep.longrepr.reprtraceback.entrysep \
+            == a.longrepr.reprtraceback.entrysep
+        assert rep.longrepr.reprtraceback.extraline \
+            == a.longrepr.reprtraceback.extraline
+        assert rep.longrepr.reprtraceback.style \
+            == a.longrepr.reprtraceback.style
+        assert rep.longrepr.sections == a.longrepr.sections
+        # Missing section attribute PR171
+        assert added_section in a.longrepr.sections
+
+    def test_reprentries_serialization_170(self, testdir):
+        from _pytest._code.code import ReprEntry
+        reprec = testdir.inline_runsource("""
+                            def test_repr_entry():
+                                x = 0
+                                assert x
+                        """, '--showlocals')
+        reports = reprec.getreports("pytest_runtest_logreport")
+        assert len(reports) == 3
+        rep = reports[1]
+        d = serialize_report(rep)
+        a = unserialize_report("testreport", d)
+
+        rep_entries = rep.longrepr.reprtraceback.reprentries
+        a_entries = a.longrepr.reprtraceback.reprentries
+        for i in range(len(a_entries)):
+            assert isinstance(rep_entries[i], ReprEntry)
+            assert rep_entries[i].lines == a_entries[i].lines
+            assert rep_entries[i].localssep == a_entries[i].localssep
+            assert rep_entries[i].reprfileloc.lineno == a_entries[i].reprfileloc.lineno
+            assert rep_entries[i].reprfileloc.message == a_entries[i].reprfileloc.message
+            assert rep_entries[i].reprfileloc.path == a_entries[i].reprfileloc.path
+            assert rep_entries[i].reprfuncargs.args == a_entries[i].reprfuncargs.args
+            assert rep_entries[i].reprlocals.lines == a_entries[i].reprlocals.lines
+            assert rep_entries[i].style == a_entries[i].style
+
+    def test_reprentries_serialization_196(self, testdir):
+        from _pytest._code.code import ReprEntryNative
+        reprec = testdir.inline_runsource("""
+                            def test_repr_entry_native():
+                                x = 0
+                                assert x
+                        """, '--tb=native')
+        reports = reprec.getreports("pytest_runtest_logreport")
+        assert len(reports) == 3
+        rep = reports[1]
+        d = serialize_report(rep)
+        a = unserialize_report("testreport", d)
+
+        rep_entries = rep.longrepr.reprtraceback.reprentries
+        a_entries = a.longrepr.reprtraceback.reprentries
+        for i in range(len(a_entries)):
+            assert isinstance(rep_entries[i], ReprEntryNative)
+            assert rep_entries[i].lines == a_entries[i].lines
+
     def test_itemreport_outcomes(self, testdir):
         reprec = testdir.inline_runsource("""
             import py
@@ -79,7 +185,7 @@ class TestReportSerialization:
                 py.test.xfail("hello")
         """)
         reports = reprec.getreports("pytest_runtest_logreport")
-        assert len(reports) == 17 # with setup/teardown "passed" reports
+        assert len(reports) == 17  # with setup/teardown "passed" reports
         for rep in reports:
             d = serialize_report(rep)
             check_marshallable(d)
@@ -93,7 +199,7 @@ class TestReportSerialization:
             assert newrep.when == rep.when
             assert newrep.keywords == rep.keywords
             if rep.failed:
-                assert newrep.longrepr == str(rep.longrepr)
+                assert newrep.longreprtext == rep.longreprtext
 
     def test_collectreport_passed(self, testdir):
         reprec = testdir.inline_runsource("def test_func(): pass")
@@ -158,7 +264,7 @@ class TestSlaveInteractor:
         ev = slave.popevent("logstart")
         assert ev.kwargs["nodeid"].endswith("test_func")
         assert len(ev.kwargs["location"]) == 3
-        ev = slave.popevent("testreport") # setup
+        ev = slave.popevent("testreport")  # setup
         ev = slave.popevent("testreport")
         assert ev.name == "testreport"
         rep = unserialize_report(ev.name, ev.kwargs['data'])
@@ -168,6 +274,8 @@ class TestSlaveInteractor:
         ev = slave.popevent("slavefinished")
         assert 'slaveoutput' in ev.kwargs
 
+    @pytest.mark.skipif(pytest.__version__ >= '3.0',
+                        reason='skip at module level illegal in pytest 3.0')
     def test_remote_collect_skip(self, slave):
         slave.testdir.makepyfile("""
             import py
@@ -246,3 +354,22 @@ class TestSlaveInteractor:
             ("pytest_collectreport", "report.collector.fspath == bbb"),
         ])
 
+    def test_process_from_remote_error_handling(self, slave, capsys):
+        slave.use_callback = True
+        slave.setup()
+        slave.slp.process_from_remote(('<nonono>', ()))
+        out, err = capsys.readouterr()
+        assert 'INTERNALERROR> ValueError: unknown event: <nonono>' in out
+        ev = slave.popevent()
+        assert ev.name == "errordown"
+
+
+def test_remote_env_vars(testdir):
+    testdir.makepyfile('''
+        import os
+        def test():
+            assert os.environ['PYTEST_XDIST_WORKER'] in ('gw0', 'gw1')
+            assert os.environ['PYTEST_XDIST_WORKER_COUNT'] == '2'
+    ''')
+    result = testdir.runpytest('-n2', '--max-slave-restart=0')
+    assert result.ret == 0

testing/test_slavemanage.py

@@ -7,43 +7,57 @@ from xdist.slavemanage import HostRSync, NodeManager
 
 pytest_plugins = "pytester"
 
-def pytest_funcarg__hookrecorder(request, config):
+
+@pytest.fixture
+def hookrecorder(request, config):
     hookrecorder = HookRecorder(config.pluginmanager)
     if hasattr(hookrecorder, "start_recording"):
         hookrecorder.start_recording(newhooks)
     request.addfinalizer(hookrecorder.finish_recording)
     return hookrecorder
 
-def pytest_funcarg__config(testdir):
+
+@pytest.fixture
+def config(testdir):
     return testdir.parseconfig()
 
-def pytest_funcarg__mysetup(tmpdir):
+
+@pytest.fixture
+def mysetup(tmpdir):
     class mysetup:
         source = tmpdir.mkdir("source")
         dest = tmpdir.mkdir("dest")
+
     return mysetup()
 
+
 @pytest.fixture
 def slavecontroller(monkeypatch):
     class MockController(object):
-        def __init__(self, *args): pass
-        def setup(self): pass
+        def __init__(self, *args):
+            pass
+
+        def setup(self):
+            pass
+
     monkeypatch.setattr(slavemanage, 'SlaveController', MockController)
     return MockController
 
+
 class TestNodeManagerPopen:
     def test_popen_no_default_chdir(self, config):
         gm = NodeManager(config, ["popen"])
         assert gm.specs[0].chdir is None
 
     def test_default_chdir(self, config):
-        l = ["ssh=noco", "socket=xyz"]
-        for spec in NodeManager(config, l).specs:
+        specs = ["ssh=noco", "socket=xyz"]
+        for spec in NodeManager(config, specs).specs:
             assert spec.chdir == "pyexecnetcache"
-        for spec in NodeManager(config, l, defaultchdir="abc").specs:
+        for spec in NodeManager(config, specs, defaultchdir="abc").specs:
             assert spec.chdir == "abc"
 
-    def test_popen_makegateway_events(self, config, hookrecorder, slavecontroller):
+    def test_popen_makegateway_events(self, config, hookrecorder,
+                                      slavecontroller):
         hm = NodeManager(config, ["popen"] * 2)
         hm.setup_nodes(None)
         call = hookrecorder.popcall("pytest_xdist_setupnodes")
@@ -64,17 +78,21 @@ class TestNodeManagerPopen:
         hm.setup_nodes(None)
         assert len(hm.group) == 2
         for gw in hm.group:
+
             class pseudoexec:
                 args = []
+
                 def __init__(self, *args):
                     self.args.extend(args)
+
                 def waitclose(self):
                     pass
+
             gw.remote_exec = pseudoexec
-        l = []
+        notifications = []
         for gw in hm.group:
-            hm.rsync(gw, source, notify=lambda *args: l.append(args))
-        assert not l
+            hm.rsync(gw, source, notify=lambda *args: notifications.append(args))
+        assert not notifications
         hm.teardown_nodes()
         assert not len(hm.group)
         assert "sys.path.insert" in gw.remote_exec.args[0]
@@ -84,19 +102,19 @@ class TestNodeManagerPopen:
         hm = NodeManager(config, ["popen//chdir=%s" % dest] * 1)
         hm.setup_nodes(None)
         source.ensure("dir1", "dir2", "hello")
-        l = []
+        notifications = []
         for gw in hm.group:
-            hm.rsync(gw, source, notify=lambda *args: l.append(args))
-        assert len(l) == 1
-        assert l[0] == ("rsyncrootready", hm.group['gw0'].spec, source)
+            hm.rsync(gw, source, notify=lambda *args: notifications.append(args))
+        assert len(notifications) == 1
+        assert notifications[0] == ("rsyncrootready", hm.group['gw0'].spec, source)
         hm.teardown_nodes()
         dest = dest.join(source.basename)
         assert dest.join("dir1").check()
         assert dest.join("dir1", "dir2").check()
         assert dest.join("dir1", "dir2", 'hello').check()
 
-    def test_rsync_same_popen_twice(self, config, mysetup,
-                                    hookrecorder, slavecontroller):
+    def test_rsync_same_popen_twice(self, config, mysetup, hookrecorder,
+                                    slavecontroller):
         source, dest = mysetup.source, mysetup.dest
         hm = NodeManager(config, ["popen//chdir=%s" % dest] * 2)
         hm.roots = []
@@ -110,6 +128,7 @@ class TestNodeManagerPopen:
         assert call.gateways[0] in hm.group
         call = hookrecorder.popcall("pytest_xdist_rsyncfinish")
 
+
 class TestHRSync:
     def test_hrsync_filter(self, mysetup):
         source, _ = mysetup.source, mysetup.dest  # noqa
@@ -118,10 +137,9 @@ class TestHRSync:
         source.ensure(".somedotfile", "moreentries")
         source.ensure("somedir", "editfile~")
         syncer = HostRSync(source, ignores=NodeManager.DEFAULT_IGNORES)
-        l = list(source.visit(rec=syncer.filter,
-                                   fil=syncer.filter))
-        assert len(l) == 3
-        basenames = [x.basename for x in l]
+        files = list(source.visit(rec=syncer.filter, fil=syncer.filter))
+        assert len(files) == 3
+        basenames = [x.basename for x in files]
         assert 'dir' in basenames
         assert 'file.txt' in basenames
         assert 'somedir' in basenames
@@ -145,7 +163,7 @@ class TestNodeManager:
         mysetup.source.ensure("dir1", "file1").write("hello")
         config = testdir.parseconfig(mysetup.source)
         nodemanager = NodeManager(config, ["popen//chdir=%s" % mysetup.dest])
-        #assert nodemanager.config.topdir == source == config.topdir
+        # assert nodemanager.config.topdir == source == config.topdir
         nodemanager.makegateways()
         nodemanager.rsync_roots()
         p, = nodemanager.gwmanager.multi_exec(
@@ -164,10 +182,8 @@ class TestNodeManager:
         for rsyncroot in (dir1, source):
             dest.remove()
             nodemanager = NodeManager(testdir.parseconfig(
-                "--tx", "popen//chdir=%s" % dest,
-                "--rsyncdir", rsyncroot,
-                source,
-            ))
+                "--tx", "popen//chdir=%s" % dest, "--rsyncdir", rsyncroot,
+                source, ))
             nodemanager.setup_nodes(None)  # calls .rsync_roots()
             if rsyncroot == source:
                 dest = dest.join("source")
@@ -230,7 +246,8 @@ class TestNodeManager:
             assert not gwspec.chdir
 
     def test_ssh_setup_nodes(self, specssh, testdir):
-        testdir.makepyfile(__init__="", test_x="""
+        testdir.makepyfile(__init__="",
+                           test_x="""
             def test_one():
                 pass
         """)

tox.ini

@@ -1,42 +1,45 @@
 [tox]
-envlist=py26,py33,py34,py27,py27-pexpect,py33-pexpect,py26-old,py33-old,flakes
+# if you change the envlist, please update .travis.yml file as well
+envlist=
+  py{27,34,35,36}-pytest{30,31,32,33}
+  py{27,36}-pytest{30,31,32,33}-pexpect
+  py{27,36}-pytest{master,features}
+  flakes
+  readme
+
 
 [testenv]
 changedir=testing
-deps=pytest>=2.5.1
-commands= py.test {posargs}
-
-[testenv:py27-pexpect]
-deps={[testenv]deps}
-    pexpect
-[testenv:py33-pexpect]
-deps={[testenv]deps}
-    pexpect
+passenv = USER USERNAME
+deps =
+  pycmd
+  # to avoid .eggs
+  setuptools_scm
+  pytest30: pytest~=3.0.5
+  pytest31: pytest~=3.1.0
+  pytest32: pytest~=3.2.0
+  pytest33: pytest~=3.3.0
+  pytestmaster: git+https://github.com/pytest-dev/pytest.git@master
+  pytestfeatures: git+https://github.com/pytest-dev/pytest.git@features
+  pexpect: pexpect
+platform=
+  pexpect: linux|darwin
+commands=
+  # always clean to avoid code unmarshal mismatch on old python/pytest
+  py.cleanup -aq
+  py.test {posargs}
 
 [testenv:flakes]
 changedir=
-deps = pytest-flakes>=0.2
-commands = py.test --flakes -m flakes testing xdist
+deps = flake8
+commands = flake8 setup.py testing xdist
 
-[testenv:py26-old]
-basepython = python2.6
-deps=
-    pytest==2.5.2
-    pycmd
+[testenv:readme]
+changedir =
+deps = readme
+skip_install = true
+commands = python setup.py check -r -s
 
-commands= 
-    py.cleanup -a
-    py.test {posargs}
-
-[testenv:py33-old]
-basepython = python3.3
-deps=
-    pytest==2.5.2
-    pycmd
-
-commands= 
-    py.cleanup -a
-    py.test {posargs}
 
 [pytest]
 addopts = -rsfxX

xdist/__init__.py

@@ -1,2 +1,3 @@
-#
-__version__ = '1.12'
+from xdist._version import version as __version__
+
+__all__ = ['__version__']

xdist/dsession.py

@@ -1,434 +1,18 @@
-import difflib
-from _pytest.runner import CollectReport
-
-import pytest
 import py
+import pytest
+
 from xdist.slavemanage import NodeManager
+from xdist.scheduler import (
+    EachScheduling,
+    LoadScheduling,
+    LoadScopeScheduling,
+    LoadFileScheduling,
+)
 
 
 queue = py.builtin._tryimport('queue', 'Queue')
 
 
-class EachScheduling:
-    """Implement scheduling of test items on all nodes
-
-    If a node gets added after the test run is started then it is
-    assumed to replace a node which got removed before it finished
-    it's collection.  In this case it will only be used if a a node
-    with the same spec got removed earlier.
-
-    Any nodes added after the run is started will only get items
-    assigned if a node with matching spec was removed before it
-    finished all it's pending items.  The new node will then be
-    assigned the remaining items from the removed node.
-    """
-
-    def __init__(self, numnodes, log=None):
-        self.numnodes = numnodes
-        self.node2collection = {}
-        self.node2pending = {}
-        self._started = []
-        self._removed2pending = {}
-        if log is None:
-            self.log = py.log.Producer("eachsched")
-        else:
-            self.log = log.eachsched
-        self.collection_is_completed = False
-
-    @property
-    def nodes(self):
-        """A list of all nodes in the scheduler."""
-        return list(self.node2pending.keys())
-
-    def hasnodes(self):
-        return bool(self.node2pending)
-
-    def haspending(self):
-        """Return True if there are pending test items
-
-        This indicates that collection has finished and nodes are
-        still processing test items, so can be thought of as "the
-        scheduler is active".
-        """
-        for pending in self.node2pending.values():
-            if pending:
-                return True
-        return False
-
-    def addnode(self, node):
-        assert node not in self.node2pending
-        self.node2pending[node] = []
-
-    def tests_finished(self):
-        if not self.collection_is_completed:
-            return False
-        if self._removed2pending:
-            return False
-        for pending in self.node2pending.values():
-            if len(pending) >= 2:
-                return False
-        return True
-
-    def addnode_collection(self, node, collection):
-        """Add the collected test items from a node
-
-        Collection is complete once all nodes have submitted their
-        collection.  In this case it's peding list is set to an empty
-        list.  When the collection is already completed this
-        submission is from a node which was restarted to replace a
-        dead node.  In this case we already assing the pending items
-        here.  In either case ``.init_distribute()`` will instruct the
-        node to start running the required tests.
-        """
-        assert node in self.node2pending
-        if not self.collection_is_completed:
-            self.node2collection[node] = list(collection)
-            self.node2pending[node] = []
-            if len(self.node2collection) >= self.numnodes:
-                self.collection_is_completed = True
-        elif self._removed2pending:
-            for deadnode in self._removed2pending:
-                if deadnode.gateway.spec == node.gateway.spec:
-                    dead_collection = self.node2collection[deadnode]
-                    if collection != dead_collection:
-                        msg = report_collection_diff(dead_collection,
-                                                     collection,
-                                                     deadnode.gateway.id,
-                                                     node.gateway.id)
-                        self.log(msg)
-                        return
-                    pending = self._removed2pending.pop(deadnode)
-                    self.node2pending[node] = pending
-                    break
-
-    def remove_item(self, node, item_index, duration=0):
-        self.node2pending[node].remove(item_index)
-
-    def remove_node(self, node):
-        # KeyError if we didn't get an addnode() yet
-        pending = self.node2pending.pop(node)
-        if not pending:
-            return
-        crashitem = self.node2collection[node][pending.pop(0)]
-        if pending:
-            self._removed2pending[node] = pending
-        return crashitem
-
-    def init_distribute(self):
-        """Schedule the test items on the nodes
-
-        If the node's pending list is empty it is a new node which
-        needs to run all the tests.  If the pending list is already
-        populated (by ``.addnode_collection()``) then it replaces a
-        died node and we only need to run those tests.
-        """
-        assert self.collection_is_completed
-        for node, pending in self.node2pending.items():
-            if node in self._started:
-                continue
-            if not pending:
-                pending[:] = range(len(self.node2collection[node]))
-                node.send_runtest_all()
-            else:
-                node.send_runtest_some(pending)
-            self._started.append(node)
-
-
-class LoadScheduling:
-    """Implement load scheduling accross nodes.
-
-    This distributes the tests collected across all nodes so each test
-    is run just once.  All nodes collect and submit the test suit and
-    when all collections are received it is verified they are
-    identical collections.  Then the collection gets devided up in
-    chunks and chunks get submitted to nodes.  Whenver a node finishes
-    an item they call ``.remove_item()`` which will trigger the
-    scheduler to assign more tests if the number of pending tests for
-    the node falls below a low-watermark.
-
-    When created ``numnodes`` defines how many nodes are expected to
-    submit a collection, this is used to know when all nodes have
-    finished collection or how large the chunks need to be created.
-
-    Attributes:
-
-    :numnodes: The expected number of nodes taking part.  The actual
-       number of nodes will vary during the scheduler's lifetime as
-       nodes are added by the DSession as they are brought up and
-       removed either because of a died node or normal shutdown.  This
-       number is primarily used to know when the initial collection is
-       completed.
-
-    :node2collection: Map of nodes and their test collection.  All
-       collections should always be identical.
-
-    :node2pending: Map of nodes and the indices of their pending
-       tests.  The indices are an index into ``.pending`` (which is
-       identical to their own collection stored in
-       ``.node2collection``).
-
-    :collection: The one collection once it is validated to be
-       identical between all the nodes.  It is initialised to None
-       until ``.init_distribute()`` is called.
-
-    :pending: List of indices of globally pending tests.  These are
-       tests which have not yet been allocated to a chunk for a node
-       to process.
-
-    :log: A py.log.Producer instance.
-
-    :config: Config object, used for handling hooks.
-    """
-
-    def __init__(self, numnodes, log=None, config=None):
-        self.numnodes = numnodes
-        self.node2collection = {}
-        self.node2pending = {}
-        self.pending = []
-        self.collection = None
-        if log is None:
-            self.log = py.log.Producer("loadsched")
-        else:
-            self.log = log.loadsched
-        self.config = config
-
-    @property
-    def nodes(self):
-        """A list of all nodes in the scheduler."""
-        return list(self.node2pending.keys())
-
-    @property
-    def collection_is_completed(self):
-        """Boolean indication initial test collection is complete.
-
-        This is a boolean indicating all initial participating nodes
-        have finished collection.  The required number of initial
-        nodes is defined by ``.numnodes``.
-        """
-        return len(self.node2collection) >= self.numnodes
-
-    def haspending(self):
-        """Return True if there are pending test items
-
-        This indicates that collection has finished and nodes are
-        still processing test items, so can be thought of as "the
-        scheduler is active".
-        """
-        if self.pending:
-            return True
-        for pending in self.node2pending.values():
-            if pending:
-                return True
-        return False
-
-    def hasnodes(self):
-        """Return True if nodes exist in the scheduler."""
-        return bool(self.node2pending)
-
-    def addnode(self, node):
-        """Add a new node in the scheduler.
-
-        From now on the node will be allocated chunks of tests to
-        execute.
-
-        Called by the ``DSession.slave_slaveready`` hook when it
-        sucessfully bootstrapped a new node.
-        """
-        assert node not in self.node2pending
-        self.node2pending[node] = []
-
-    def tests_finished(self):
-        """Return True if all tests have been executed by the nodes."""
-        if not self.collection_is_completed:
-            return False
-        if self.pending:
-            return False
-        for pending in self.node2pending.values():
-            if len(pending) >= 2:
-                return False
-        return True
-
-    def addnode_collection(self, node, collection):
-        """Add the collected test items from a node
-
-        The collection is stored in the ``.node2collection`` map.
-        Called by the ``DSession.slave_collectionfinish`` hook.
-        """
-        assert node in self.node2pending
-        if self.collection_is_completed:
-            # A new node has been added later, perhaps an original one died.
-            assert self.collection  # .init_distribute() should have
-                                    # been called by now
-            if collection != self.collection:
-                other_node = next(iter(self.node2collection.keys()))
-                msg = report_collection_diff(self.collection,
-                                             collection,
-                                             other_node.gateway.id,
-                                             node.gateway.id)
-                self.log(msg)
-                return
-        self.node2collection[node] = list(collection)
-
-    def remove_item(self, node, item_index, duration=0):
-        """Mark test item as completed by node
-
-        The duration it took to execute the item is used as a hint to
-        the scheduler.
-
-        This is called by the ``DSession.slave_testreport`` hook.
-        """
-        self.node2pending[node].remove(item_index)
-        self.check_schedule(node, duration=duration)
-
-    def check_schedule(self, node, duration=0):
-        """Maybe schedule new items on the node
-
-        If there are any globally pending nodes left then this will
-        check if the given node should be given any more tests.  The
-        ``duration`` of the last test is optionally used as a
-        heuristic to influence how many tests the node is assigned.
-        """
-        if self.pending:
-            # how many nodes do we have?
-            num_nodes = len(self.node2pending)
-            # if our node goes below a heuristic minimum, fill it out to
-            # heuristic maximum
-            items_per_node_min = max(2, len(self.pending) // num_nodes // 4)
-            items_per_node_max = max(2, len(self.pending) // num_nodes // 2)
-            node_pending = self.node2pending[node]
-            if len(node_pending) < items_per_node_min:
-                if duration >= 0.1 and len(node_pending) >= 2:
-                    # seems the node is doing long-running tests
-                    # and has enough items to continue
-                    # so let's rather wait with sending new items
-                    return
-                num_send = items_per_node_max - len(node_pending)
-                self._send_tests(node, num_send)
-        self.log("num items waiting for node:", len(self.pending))
-
-    def remove_node(self, node):
-        """Remove an node from the scheduler
-
-        This should be called either when the node crashed or at
-        shutdown time.  In the former case any pending items assigned
-        to the node will be re-scheduled.  Called by the
-        ``DSession.slave_slavefinished`` and
-        ``DSession.slave_errordown`` hooks.
-
-        Return the item which was being executing while the node
-        crashed or None if the node has no more pending items.
-
-        """
-        pending = self.node2pending.pop(node)
-        if not pending:
-            return
-
-        # The node crashed, reassing pending items
-        crashitem = self.collection[pending.pop(0)]
-        self.pending.extend(pending)
-        for node in self.node2pending:
-            self.check_schedule(node)
-        return crashitem
-
-    def init_distribute(self):
-        """Initiate distribution of the test collection
-
-        Initiate scheduling of the items across the nodes.  If this
-        gets called again later it behaves the same as calling
-        ``.check_schedule()`` on all nodes so that newly added nodes
-        will start to be used.
-
-        This is called by the ``DSession.slave_collectionfinish`` hook
-        if ``.collection_is_completed`` is True.
-
-        XXX Perhaps this method should have been called ".schedule()".
-        """
-        assert self.collection_is_completed
-
-        # Initial distribution already happend, reschedule on all nodes
-        if self.collection is not None:
-            for node in self.nodes:
-                self.check_schedule(node)
-            return
-
-        # XXX allow nodes to have different collections
-        if not self._check_nodes_have_same_collection():
-            self.log('**Different tests collected, aborting run**')
-            return
-
-        # Collections are identical, create the index of pending items.
-        self.collection = list(self.node2collection.values())[0]
-        self.pending[:] = range(len(self.collection))
-        if not self.collection:
-            return
-
-        # how many items per node do we have about?
-        items_per_node = len(self.collection) // len(self.node2pending)
-        # take a fraction of tests for initial distribution
-        node_chunksize = max(items_per_node // 4, 2)
-        # and initialize each node with a chunk of tests
-        for node in self.nodes:
-            self._send_tests(node, node_chunksize)
-
-    def _send_tests(self, node, num):
-        tests_per_node = self.pending[:num]
-        if tests_per_node:
-            del self.pending[:num]
-            self.node2pending[node].extend(tests_per_node)
-            node.send_runtest_some(tests_per_node)
-
-    def _check_nodes_have_same_collection(self):
-        """Return True if all nodes have collected the same items.
-
-        If collections differ, this method returns False while logging
-        the collection differences and posting collection errors to
-        pytest_collectreport hook.
-        """
-        node_collection_items = list(self.node2collection.items())
-        first_node, col = node_collection_items[0]
-        same_collection = True
-        for node, collection in node_collection_items[1:]:
-            msg = report_collection_diff(
-                col,
-                collection,
-                first_node.gateway.id,
-                node.gateway.id,
-            )
-            if msg:
-                same_collection = False
-                self.log(msg)
-                if self.config is not None:
-                    rep = CollectReport(node.gateway.id, 'failed', longrepr=msg,
-                                        result=[])
-                    self.config.hook.pytest_collectreport(report=rep)
-
-        return same_collection
-
-
-def report_collection_diff(from_collection, to_collection, from_id, to_id):
-    """Report the collected test difference between two nodes.
-
-    :returns: detailed message describing the difference between the given
-    collections, or None if they are equal.
-    """
-    if from_collection == to_collection:
-        return None
-
-    diff = difflib.unified_diff(
-        from_collection,
-        to_collection,
-        fromfile=from_id,
-        tofile=to_id,
-    )
-    error_message = py.builtin._totext(
-        'Different tests were collected between {from_id} and {to_id}. '
-        'The difference is:\n'
-        '{diff}'
-    ).format(from_id=from_id, to_id=to_id, diff='\n'.join(diff))
-    msg = "\n".join([x.rstrip() for x in error_message.split("\n")])
-    return msg
-
-
 class Interrupted(KeyboardInterrupt):
     """ signals an immediate interruption. """
 
@@ -446,17 +30,25 @@ class DSession:
     automatically starts collecting tests.  Once tests are collected
     it will wait for instructions.
     """
+
     def __init__(self, config):
         self.config = config
         self.log = py.log.Producer("dsession")
         if not config.option.debug:
             py.log.setconsumer(self.log._keywords, None)
+        self.nodemanager = None
+        self.sched = None
         self.shuttingdown = False
         self.countfailures = 0
         self.maxfail = config.getvalue("maxfail")
         self.queue = queue.Queue()
+        self._session = None
         self._failed_collection_errors = {}
         self._active_nodes = set()
+        self._failed_nodes_count = 0
+        self._max_slave_restart = self.config.getoption('max_slave_restart')
+        if self._max_slave_restart is not None:
+            self._max_slave_restart = int(self._max_slave_restart)
         try:
             self.terminal = config.pluginmanager.getplugin("terminalreporter")
         except KeyError:
@@ -470,7 +62,7 @@ class DSession:
         """Return True if the distributed session has finished
 
         This means all nodes have executed all test items.  This is
-        used to by pytest_runtestloop to break out of it's loop.
+        used by pytest_runtestloop to break out of its loop.
         """
         return bool(self.shuttingdown and not self._active_nodes)
 
@@ -488,37 +80,52 @@ class DSession:
         self.nodemanager = NodeManager(self.config)
         nodes = self.nodemanager.setup_nodes(putevent=self.queue.put)
         self._active_nodes.update(nodes)
+        self._session = session
 
     def pytest_sessionfinish(self, session):
         """Shutdown all nodes."""
         nm = getattr(self, 'nodemanager', None)  # if not fully initialized
         if nm is not None:
             nm.teardown_nodes()
+        self._session = None
 
     def pytest_collection(self):
         # prohibit collection of test items in master process
         return True
 
+    @pytest.mark.trylast
+    def pytest_xdist_make_scheduler(self, config, log):
+        dist = config.getvalue('dist')
+        schedulers = {
+            'each': EachScheduling,
+            'load': LoadScheduling,
+            'loadscope': LoadScopeScheduling,
+            'loadfile': LoadFileScheduling,
+        }
+        return schedulers[dist](config, log)
+
     def pytest_runtestloop(self):
-        numnodes = len(self.nodemanager.specs)
-        dist = self.config.getvalue("dist")
-        if dist == "load":
-            self.sched = LoadScheduling(numnodes, log=self.log,
-                                        config=self.config)
-        elif dist == "each":
-            self.sched = EachScheduling(numnodes, log=self.log)
-        else:
-            assert 0, dist
+        self.sched = self.config.hook.pytest_xdist_make_scheduler(
+            config=self.config,
+            log=self.log
+        )
+        assert self.sched is not None
+
         self.shouldstop = False
         while not self.session_finished:
             self.loop_once()
             if self.shouldstop:
+                self.triggershutdown()
                 raise Interrupted(str(self.shouldstop))
         return True
 
     def loop_once(self):
         """Process one callback from one of the slaves."""
         while 1:
+            if not self._active_nodes:
+                # If everything has died stop looping
+                self.triggershutdown()
+                raise RuntimeError("Unexpectedly no active workers available")
             try:
                 eventcall = self.queue.get(timeout=2.0)
                 break
@@ -530,7 +137,7 @@ class DSession:
         call = getattr(self, method)
         self.log("calling method", method, kwargs)
         call(**kwargs)
-        if self.sched.tests_finished():
+        if self.sched.tests_finished:
             self.triggershutdown()
 
     #
@@ -550,14 +157,14 @@ class DSession:
         if self.shuttingdown:
             node.shutdown()
         else:
-            self.sched.addnode(node)
+            self.sched.add_node(node)
 
     def slave_slavefinished(self, node):
         """Emitted when node executes its pytest_sessionfinish hook.
 
         Removes the node from the scheduler.
 
-        The node might not be the scheduler if it had not emitted
+        The node might not be in the scheduler if it had not emitted
         slaveready before shutdown was triggered.
         """
         self.config.hook.pytest_testnodedown(node=node, error=None)
@@ -580,8 +187,20 @@ class DSession:
         else:
             if crashitem:
                 self.handle_crashitem(crashitem, node)
-        self.report_line("Replacing failed node %s" % node.gateway.id)
-        self._clone_node(node)
+
+        self._failed_nodes_count += 1
+        maximum_reached = (self._max_slave_restart is not None and
+                           self._failed_nodes_count > self._max_slave_restart)
+        if maximum_reached:
+            if self._max_slave_restart == 0:
+                msg = 'Slave restarting disabled'
+            else:
+                msg = "Maximum crashed slaves reached: %d" % \
+                      self._max_slave_restart
+            self.report_line(msg)
+        else:
+            self.report_line("Replacing crashed slave %s" % node.gateway.id)
+            self._clone_node(node)
         self._active_nodes.remove(node)
 
     def slave_collectionfinish(self, node, ids):
@@ -589,22 +208,27 @@ class DSession:
 
         This adds the collection for this node to the scheduler.  If
         the scheduler indicates collection is finished (i.e. all
-        initial nodes have submitted their collection), then tells the
+        initial nodes have submitted their collections), then tells the
         scheduler to schedule the collected items.  When initiating
         scheduling the first time it logs which scheduler is in use.
         """
         if self.shuttingdown:
             return
-        self.sched.addnode_collection(node, ids)
+        self.config.hook.pytest_xdist_node_collection_finished(node=node,
+                                                               ids=ids)
+        # tell session which items were effectively collected otherwise
+        # the master node will finish the session with EXIT_NOTESTSCOLLECTED
+        self._session.testscollected = len(ids)
+        self.sched.add_node_collection(node, ids)
         if self.terminal:
             self.trdist.setstatus(node.gateway.spec, "[%d]" % (len(ids)))
         if self.sched.collection_is_completed:
-            if self.terminal and not self.sched.haspending():
+            if self.terminal and not self.sched.has_pending:
                 self.trdist.ensure_show_status()
                 self.terminal.write_line("")
                 self.terminal.write_line("scheduling tests via %s" % (
                     self.sched.__class__.__name__))
-            self.sched.init_distribute()
+            self.sched.schedule()
 
     def slave_logstart(self, node, nodeid, location):
         """Emitted when a node calls the pytest_runtest_logstart hook."""
@@ -612,29 +236,35 @@ class DSession:
             nodeid=nodeid, location=location)
 
     def slave_testreport(self, node, rep):
-        """Emitted when a node calls the pytest_runtest_logreport hook.
-
-        If the node indicates it is finished with a test item remove
-        the item from the pending list in the scheduler.
-        """
-        if rep.when == "call" or (rep.when == "setup" and not rep.passed):
-            self.sched.remove_item(node, rep.item_index, rep.duration)
-        #self.report_line("testreport %s: %s" %(rep.id, rep.status))
+        """Emitted when a node calls the pytest_runtest_logreport hook."""
         rep.node = node
         self.config.hook.pytest_runtest_logreport(report=rep)
         self._handlefailures(rep)
 
+    def slave_runtest_protocol_complete(self, node, item_index, duration):
+        """
+        Emitted when a node fires the 'runtest_protocol_complete' event,
+        signalling that a test has completed the runtestprotocol and should be
+        removed from the pending list in the scheduler.
+        """
+        self.sched.mark_test_complete(node, item_index, duration)
+
     def slave_collectreport(self, node, rep):
         """Emitted when a node calls the pytest_collectreport hook."""
         if rep.failed:
             self._failed_slave_collectreport(node, rep)
 
+    def slave_logwarning(self, message, code, nodeid, fslocation):
+        """Emitted when a node calls the pytest_logwarning hook."""
+        kwargs = dict(message=message, code=code, nodeid=nodeid, fslocation=fslocation)
+        self.config.hook.pytest_logwarning.call_historic(kwargs=kwargs)
+
     def _clone_node(self, node):
         """Return new node based on an existing one.
 
-        This is normally for when a node died, this will copy the spec
+        This is normally for when a node dies, this will copy the spec
         of the existing node and create a new one with a new id.  The
-        new node will have been setup so will start calling the
+        new node will have been setup so it will start calling the
         "slave_*" hooks and do work soon.
         """
         spec = node.gateway.spec
@@ -683,26 +313,27 @@ class TerminalDistReporter:
         self.tr = config.pluginmanager.getplugin("terminalreporter")
         self._status = {}
         self._lastlen = 0
+        self._isatty = getattr(self.tr, 'isatty', self.tr.hasmarkup)
 
     def write_line(self, msg):
         self.tr.write_line(msg)
 
     def ensure_show_status(self):
-        if not self.tr.hasmarkup:
+        if not self._isatty:
             self.write_line(self.getstatus())
 
     def setstatus(self, spec, status, show=True):
         self._status[spec.id] = status
-        if show and self.tr.hasmarkup:
+        if show and self._isatty:
             self.rewrite(self.getstatus())
 
     def getstatus(self):
-        parts = ["%s %s" %(spec.id, self._status[spec.id])
-                   for spec in self._specs]
+        parts = ["%s %s" % (spec.id, self._status[spec.id])
+                 for spec in self._specs]
         return " / ".join(parts)
 
     def rewrite(self, line, newline=False):
-        pline = line + " " * max(self._lastlen-len(line), 0)
+        pline = line + " " * max(self._lastlen - len(line), 0)
         if newline:
             self._lastlen = 0
             pline += "\n"
@@ -729,7 +360,7 @@ class TerminalDistReporter:
     def pytest_testnodeready(self, node):
         if self.config.option.verbose > 0:
             d = node.slaveinfo
-            infoline = "[%s] Python %s" %(
+            infoline = "[%s] Python %s" % (
                 d['id'],
                 d['version'].replace('\n', ' -- '),)
             self.rewrite(infoline, newline=True)
@@ -738,13 +369,12 @@ class TerminalDistReporter:
     def pytest_testnodedown(self, node, error):
         if not error:
             return
-        self.write_line("[%s] node down: %s" %(node.gateway.id, error))
+        self.write_line("[%s] node down: %s" % (node.gateway.id, error))
 
-    #def pytest_xdist_rsyncstart(self, source, gateways):
+    # def pytest_xdist_rsyncstart(self, source, gateways):
     #    targets = ",".join([gw.id for gw in gateways])
     #    msg = "[%s] rsyncing: %s" %(targets, source)
     #    self.write_line(msg)
-    #def pytest_xdist_rsyncfinish(self, source, gateways):
+    # def pytest_xdist_rsyncfinish(self, source, gateways):
     #    targets = ", ".join(["[%s]" % gw.id for gw in gateways])
     #    self.write_line("rsyncfinish: %s -> %s" %(source, targets))
-

xdist/looponfail.py

@@ -7,10 +7,32 @@
     the controlling process which should best never happen.
 """
 
-import py, pytest
+import py
+import pytest
 import sys
 import execnet
 
+
+def pytest_addoption(parser):
+    group = parser.getgroup("xdist", "distributed and subprocess testing")
+    group._addoption(
+        '-f', '--looponfail',
+        action="store_true", dest="looponfail", default=False,
+        help="run tests in subprocess, wait for modified files "
+             "and re-run failing test set until all pass.")
+
+
+def pytest_cmdline_main(config):
+
+    if config.getoption("looponfail"):
+        usepdb = config.getoption('usepdb')  # a core option
+        if usepdb:
+            raise pytest.UsageError(
+                "--pdb incompatible with --looponfail.")
+        looponfail_main(config)
+        return 2  # looponfail only can get stop with ctrl-C anyway
+
+
 def looponfail_main(config):
     remotecontrol = RemoteControl(config)
     rootdirs = config.getini("looponfailroots")
@@ -19,7 +41,8 @@ def looponfail_main(config):
         while 1:
             remotecontrol.loop_once()
             if not remotecontrol.failures and remotecontrol.wasfailing:
-                continue # the last failures passed, let's immediately rerun all
+                # the last failures passed, let's immediately rerun all
+                continue
             repr_pytest_looponfailinfo(
                 failreports=remotecontrol.failures,
                 rootdirs=rootdirs)
@@ -27,6 +50,7 @@ def looponfail_main(config):
     except KeyboardInterrupt:
         print()
 
+
 class RemoteControl(object):
     def __init__(self, config):
         self.config = config
@@ -47,11 +71,13 @@ class RemoteControl(object):
             raise ValueError("already have gateway %r" % self.gateway)
         self.trace("setting up slave session")
         self.gateway = self.initgateway()
-        self.channel = channel = self.gateway.remote_exec(init_slave_session,
+        self.channel = channel = self.gateway.remote_exec(
+            init_slave_session,
             args=self.config.args,
             option_dict=vars(self.config.option),
         )
         remote_outchannel = channel.receive()
+
         def write(s):
             out._file.write(s)
             out._file.flush()
@@ -87,7 +113,7 @@ class RemoteControl(object):
         result = self.runsession()
         failures, reports, collection_failed = result
         if collection_failed:
-            pass # "Collection failed, keeping previous failure set"
+            pass  # "Collection failed, keeping previous failure set"
         else:
             uniq_failures = []
             for failure in failures:
@@ -95,6 +121,7 @@ class RemoteControl(object):
                     uniq_failures.append(failure)
             self.failures = uniq_failures
 
+
 def repr_pytest_looponfailinfo(failreports, rootdirs):
     tr = py.io.TerminalWriter()
     if failreports:
@@ -104,11 +131,12 @@ def repr_pytest_looponfailinfo(failreports, rootdirs):
                 tr.line(report, red=True)
     tr.sep("#", "waiting for changes", bold=True)
     for rootdir in rootdirs:
-        tr.line("### Watching:   %s" %(rootdir,), bold=True)
+        tr.line("### Watching:   %s" % (rootdir,), bold=True)
 
 
 def init_slave_session(channel, args, option_dict):
-    import os, sys
+    import os
+    import sys
     outchannel = channel.gateway.newchannel()
     sys.stdout = sys.stderr = outchannel.makefile('w')
     channel.send(outchannel)
@@ -121,13 +149,14 @@ def init_slave_session(channel, args, option_dict):
             newpaths.append(p)
     sys.path[:] = newpaths
 
-    #fullwidth, hasmarkup = channel.receive()
+    # fullwidth, hasmarkup = channel.receive()
     from _pytest.config import Config
     config = Config.fromdictargs(option_dict, list(args))
     config.args = args
     from xdist.looponfail import SlaveFailSession
     SlaveFailSession(config, channel).main()
 
+
 class SlaveFailSession:
     def __init__(self, config, channel):
         self.config = config
@@ -150,7 +179,8 @@ class SlaveFailSession:
             items = session.perform_collect(self.trails or None)
         except pytest.UsageError:
             items = session.perform_collect(None)
-        hook.pytest_collection_modifyitems(session=session, config=session.config, items=items)
+        hook.pytest_collection_modifyitems(
+            session=session, config=session.config, items=items)
         hook.pytest_collection_finish(session=session)
         return True
 
@@ -168,7 +198,7 @@ class SlaveFailSession:
         try:
             command = self.channel.receive()
         except KeyboardInterrupt:
-            return # in the slave we can't do much about this
+            return  # in the slave we can't do much about this
         self.DEBUG("received", command)
         self.current_command = command
         self.config.hook.pytest_cmdline_main(config=self.config)
@@ -180,14 +210,16 @@ class SlaveFailSession:
             failreports.append(loc)
         self.channel.send((trails, failreports, self.collection_failed))
 
+
 class StatRecorder:
     def __init__(self, rootdirlist):
         self.rootdirlist = rootdirlist
         self.statcache = {}
-        self.check() # snapshot state
+        self.check()  # snapshot state
 
     def fil(self, p):
         return p.check(file=1, dotfile=0) and p.ext != ".pyc"
+
     def rec(self, p):
         return p.check(dotfile=0)
 
@@ -198,7 +230,7 @@ class StatRecorder:
                 return
             py.std.time.sleep(checkinterval)
 
-    def check(self, removepycfiles=True):
+    def check(self, removepycfiles=True):  # noqa, too complex
         changed = False
         statcache = self.statcache
         newstat = {}
@@ -212,8 +244,8 @@ class StatRecorder:
                         changed = True
                 else:
                     if oldstat:
-                       if oldstat.mtime != curstat.mtime or \
-                          oldstat.size != curstat.size:
+                        if oldstat.mtime != curstat.mtime or \
+                           oldstat.size != curstat.size:
                             changed = True
                             py.builtin.print_("# MODIFIED", path)
                             if removepycfiles and path.ext == ".py":
@@ -227,4 +259,3 @@ class StatRecorder:
             changed = True
         self.statcache = newstat
         return changed
-

xdist/newhooks.py

@@ -1,21 +1,52 @@
+"""
+xdist hooks.
+
+Additionally, pytest-xdist will also decorate a few other hooks
+with the worker instance that executed the hook originally:
+
+``pytest_runtest_logreport``: ``rep`` parameter has a ``node`` attribute.
+
+You can use this hooks just as you would use normal pytest hooks, but some care
+must be taken in plugins in case ``xdist`` is not installed. Please see:
+
+    http://pytest.org/en/latest/writing_plugins.html#optionally-using-hooks-from-3rd-party-plugins
+"""
+import pytest
+
 
 def pytest_xdist_setupnodes(config, specs):
     """ called before any remote node is set up. """
 
+
 def pytest_xdist_newgateway(gateway):
     """ called on new raw gateway creation. """
 
+
 def pytest_xdist_rsyncstart(source, gateways):
     """ called before rsyncing a directory to remote gateways takes place. """
 
+
 def pytest_xdist_rsyncfinish(source, gateways):
     """ called after rsyncing a directory to remote gateways takes place. """
 
+
 def pytest_configure_node(node):
     """ configure node information before it gets instantiated. """
 
+
 def pytest_testnodeready(node):
     """ Test Node is ready to operate. """
 
+
 def pytest_testnodedown(node, error):
     """ Test Node is down. """
+
+
+def pytest_xdist_node_collection_finished(node, ids):
+    """called by the master node when a node finishes collecting.
+    """
+
+
+@pytest.mark.firstresult
+def pytest_xdist_make_scheduler(config, log):
+    """ return a node scheduler implementation """

xdist/plugin.py

@@ -1,48 +1,83 @@
 import py
 import pytest
 
+
+def parse_numprocesses(s):
+    if s == 'auto':
+        try:
+            from os import cpu_count
+        except ImportError:
+            from multiprocessing import cpu_count
+        try:
+            n = cpu_count()
+        except NotImplementedError:
+            return 1
+        return n if n else 1
+    else:
+        return int(s)
+
+
 def pytest_addoption(parser):
     group = parser.getgroup("xdist", "distributed and subprocess testing")
-    group._addoption('-f', '--looponfail',
-           action="store_true", dest="looponfail", default=False,
-           help="run tests in subprocess, wait for modified files "
-                "and re-run failing test set until all pass.")
-    group._addoption('-n', dest="numprocesses", metavar="numprocesses",
-           action="store", type="int",
-           help="shortcut for '--dist=load --tx=NUM*popen'")
-    group.addoption('--boxed',
-           action="store_true", dest="boxed", default=False,
-           help="box each test run in a separate process (unix)")
-    group._addoption('--dist', metavar="distmode",
-           action="store", choices=['load', 'each', 'no'],
-           type="choice", dest="dist", default="no",
-           help=("set mode for distributing tests to exec environments.\n\n"
-                 "each: send each test to each available environment.\n\n"
-                 "load: send each test to available environment.\n\n"
-                 "(default) no: run tests inprocess, don't distribute."))
-    group._addoption('--tx', dest="tx", action="append", default=[],
-           metavar="xspec",
-           help=("add a test execution environment. some examples: "
-                 "--tx popen//python=python2.5 --tx socket=192.168.1.102:8888 "
-                 "--tx ssh=user@codespeak.net//chdir=testcache"))
-    group._addoption('-d',
-           action="store_true", dest="distload", default=False,
-           help="load-balance tests.  shortcut for '--dist=load'")
-    group.addoption('--rsyncdir', action="append", default=[], metavar="DIR",
-           help="add directory for rsyncing to remote tx nodes.")
-    group.addoption('--rsyncignore', action="append", default=[], metavar="GLOB",
-           help="add expression for ignores when rsyncing to remote tx nodes.")
+    group._addoption(
+        '-n', '--numprocesses', dest="numprocesses", metavar="numprocesses",
+        action="store",
+        type=parse_numprocesses,
+        help="shortcut for '--dist=load --tx=NUM*popen', "
+             "you can use 'auto' here for auto detection CPUs number on "
+             "host system")
+    group.addoption('--max-slave-restart', action="store", default=None,
+                    help="maximum number of slaves that can be restarted "
+                         "when crashed (set to zero to disable this feature)")
+    group.addoption(
+        '--dist', metavar="distmode",
+        action="store", choices=['each', 'load', 'loadscope', 'loadfile', 'no'],
+        dest="dist", default="no",
+        help=("set mode for distributing tests to exec environments.\n\n"
+              "each: send each test to all available environments.\n\n"
+              "load: load balance by sending any pending test to any"
+              " available environment.\n\n"
+              "loadscope: load balance by sending pending groups of tests in"
+              " the same scope to any available environment.\n\n"
+              "loadfile: load balance by sending test grouped by file"
+              " to any available environment.\n\n"
+              "(default) no: run tests inprocess, don't distribute."))
+    group.addoption(
+        '--tx', dest="tx", action="append", default=[],
+        metavar="xspec",
+        help=("add a test execution environment. some examples: "
+              "--tx popen//python=python2.5 --tx socket=192.168.1.102:8888 "
+              "--tx ssh=user@codespeak.net//chdir=testcache"))
+    group._addoption(
+        '-d',
+        action="store_true", dest="distload", default=False,
+        help="load-balance tests.  shortcut for '--dist=load'")
+    group.addoption(
+        '--rsyncdir', action="append", default=[], metavar="DIR",
+        help="add directory for rsyncing to remote tx nodes.")
+    group.addoption(
+        '--rsyncignore', action="append", default=[], metavar="GLOB",
+        help="add expression for ignores when rsyncing to remote tx nodes.")
 
-    parser.addini('rsyncdirs', 'list of (relative) paths to be rsynced for'
-         ' remote distributed testing.', type="pathlist")
-    parser.addini('rsyncignore', 'list of (relative) glob-style paths to be ignored '
-         'for rsyncing.', type="pathlist")
-    parser.addini("looponfailroots", type="pathlist",
+    group.addoption(
+        "--boxed", action="store_true",
+        help="backward compatibility alias for pytest-forked --forked")
+    parser.addini(
+        'rsyncdirs', 'list of (relative) paths to be rsynced for'
+        ' remote distributed testing.', type="pathlist")
+    parser.addini(
+        'rsyncignore', 'list of (relative) glob-style paths to be ignored '
+        'for rsyncing.', type="pathlist")
+    parser.addini(
+        "looponfailroots", type="pathlist",
         help="directories to check for changes", default=[py.path.local()])
 
+
 # -------------------------------------------------------------------------
 # distributed testing hooks
 # -------------------------------------------------------------------------
+
+
 def pytest_addhooks(pluginmanager):
     from xdist import newhooks
     # avoid warnings with pytest-2.8
@@ -55,81 +90,46 @@ def pytest_addhooks(pluginmanager):
 # distributed testing initialization
 # -------------------------------------------------------------------------
 
-def pytest_cmdline_main(config):
-    check_options(config)
-    if config.getoption("looponfail"):
-        from xdist.looponfail import looponfail_main
-        looponfail_main(config)
-        return 2 # looponfail only can get stop with ctrl-C anyway
 
 @pytest.mark.trylast
 def pytest_configure(config):
-    if config.getoption("dist") != "no":
+    if config.getoption("dist") != "no" and not config.getvalue("collectonly"):
         from xdist.dsession import DSession
         session = DSession(config)
         config.pluginmanager.register(session, "dsession")
         tr = config.pluginmanager.getplugin("terminalreporter")
         tr.showfspath = False
+    if config.getoption("boxed"):
+        config.option.forked = True
 
-def check_options(config):
+
+@pytest.mark.tryfirst
+def pytest_cmdline_main(config):
     if config.option.numprocesses:
-        config.option.dist = "load"
-        config.option.tx = ['popen'] * int(config.option.numprocesses)
+        if config.option.dist == 'no':
+            config.option.dist = "load"
+        config.option.tx = ['popen'] * config.option.numprocesses
     if config.option.distload:
         config.option.dist = "load"
     val = config.getvalue
     if not val("collectonly"):
-        usepdb = config.option.usepdb  # a core option
-        if val("looponfail"):
+        usepdb = config.getoption('usepdb')  # a core option
+        if val("dist") != "no":
             if usepdb:
-                raise pytest.UsageError("--pdb incompatible with --looponfail.")
-        elif val("dist") != "no":
-            if usepdb:
-                raise pytest.UsageError("--pdb incompatible with distributing tests.")
+                raise pytest.UsageError(
+                    "--pdb is incompatible with distributing tests; try using -n0.")  # noqa: E501
+
+# -------------------------------------------------------------------------
+# fixtures
+# -------------------------------------------------------------------------
 
 
-def pytest_runtest_protocol(item):
-    if item.config.getvalue("boxed"):
-        reports = forked_run_report(item)
-        for rep in reports:
-            item.ihook.pytest_runtest_logreport(report=rep)
-        return True
-
-def forked_run_report(item):
-    # for now, we run setup/teardown in the subprocess
-    # XXX optionally allow sharing of setup/teardown
-    from _pytest.runner import runtestprotocol
-    EXITSTATUS_TESTEXIT = 4
-    import marshal
-    from xdist.remote import serialize_report
-    from xdist.slavemanage import unserialize_report
-    def runforked():
-        try:
-            reports = runtestprotocol(item, log=False)
-        except KeyboardInterrupt:
-            py.std.os._exit(EXITSTATUS_TESTEXIT)
-        return marshal.dumps([serialize_report(x) for x in reports])
-
-    ff = py.process.ForkedFunc(runforked)
-    result = ff.waitfinish()
-    if result.retval is not None:
-        report_dumps = marshal.loads(result.retval)
-        return [unserialize_report("testreport", x) for x in report_dumps]
+@pytest.fixture(scope="session")
+def worker_id(request):
+    """Return the id of the current worker ('gw0', 'gw1', etc) or 'master'
+    if running on the master node.
+    """
+    if hasattr(request.config, 'slaveinput'):
+        return request.config.slaveinput['slaveid']
     else:
-        if result.exitstatus == EXITSTATUS_TESTEXIT:
-            py.test.exit("forked test item %s raised Exit" %(item,))
-        return [report_process_crash(item, result)]
-
-def report_process_crash(item, result):
-    path, lineno = item._getfslineno()
-    info = ("%s:%s: running the test CRASHED with signal %d" %
-            (path, lineno, result.signal))
-    from _pytest import runner
-    call = runner.CallInfo(lambda: 0/0, "???")
-    call.excinfo = info
-    rep = runner.pytest_runtest_makereport(item, call)
-    if result.out:
-        rep.sections.append(("captured stdout", result.out))
-    if result.err:
-        rep.sections.append(("captured stderr", result.err))
-    return rep
+        return 'master'

xdist/remote.py

@@ -6,7 +6,11 @@
     needs not to be installed in remote environments.
 """
 
-import sys, os
+import sys
+import os
+import time
+import pytest
+
 
 class SlaveInteractor:
     def __init__(self, config, channel):
@@ -31,11 +35,11 @@ class SlaveInteractor:
         slaveinfo = getinfodict()
         self.sendevent("slaveready", slaveinfo=slaveinfo)
 
-    def pytest_sessionfinish(self, __multicall__, exitstatus):
+    @pytest.hookimpl(hookwrapper=True)
+    def pytest_sessionfinish(self, exitstatus):
         self.config.slaveoutput['exitstatus'] = exitstatus
-        res = __multicall__.execute()
+        yield
         self.sendevent("slavefinished", slaveoutput=self.config.slaveoutput)
-        return res
 
     def pytest_collection(self, session):
         self.sendevent("collectionstart")
@@ -44,7 +48,10 @@ class SlaveInteractor:
         self.log("entering main loop")
         torun = []
         while 1:
-            name, kwargs = self.channel.receive()
+            try:
+                name, kwargs = self.channel.receive()
+            except EOFError:
+                return True
             self.log("received command", name, kwargs)
             if name == "runtests":
                 torun.extend(kwargs['indices'])
@@ -53,26 +60,33 @@ class SlaveInteractor:
             self.log("items to run:", torun)
             # only run if we have an item and a next item
             while len(torun) >= 2:
-                self.run_tests(torun)
+                self.run_one_test(torun)
             if name == "shutdown":
                 if torun:
-                    self.run_tests(torun)
+                    self.run_one_test(torun)
                 break
         return True
 
-    def run_tests(self, torun):
+    def run_one_test(self, torun):
         items = self.session.items
         self.item_index = torun.pop(0)
+        item = items[self.item_index]
         if torun:
             nextitem = items[torun[0]]
         else:
             nextitem = None
+
+        start = time.time()
         self.config.hook.pytest_runtest_protocol(
-            item=items[self.item_index],
+            item=item,
             nextitem=nextitem)
+        duration = time.time() - start
+        self.sendevent("runtest_protocol_complete", item_index=self.item_index,
+                       duration=duration)
 
     def pytest_collection_finish(self, session):
-        self.sendevent("collectionfinish",
+        self.sendevent(
+            "collectionfinish",
             topdir=str(session.fspath),
             ids=[item.nodeid for item in session.items])
 
@@ -82,6 +96,7 @@ class SlaveInteractor:
     def pytest_runtest_logreport(self, report):
         data = serialize_report(report)
         data["item_index"] = self.item_index
+        data["worker_id"] = self.slaveid
         assert self.session.items[self.item_index].nodeid == report.nodeid
         self.sendevent("testreport", data=data)
 
@@ -89,31 +104,65 @@ class SlaveInteractor:
         data = serialize_report(report)
         self.sendevent("collectreport", data=data)
 
+    def pytest_logwarning(self, message, code, nodeid, fslocation):
+        self.sendevent("logwarning", message=message, code=code, nodeid=nodeid,
+                       fslocation=str(fslocation))
+
+
 def serialize_report(rep):
+    def disassembled_report(rep):
+        reprtraceback = rep.longrepr.reprtraceback.__dict__.copy()
+        reprcrash = rep.longrepr.reprcrash.__dict__.copy()
+
+        new_entries = []
+        for entry in reprtraceback['reprentries']:
+            entry_data = {
+                'type': type(entry).__name__,
+                'data': entry.__dict__.copy(),
+            }
+            for key, value in entry_data['data'].items():
+                if hasattr(value, '__dict__'):
+                    entry_data['data'][key] = value.__dict__.copy()
+            new_entries.append(entry_data)
+
+        reprtraceback['reprentries'] = new_entries
+
+        return {
+            'reprcrash': reprcrash,
+            'reprtraceback': reprtraceback,
+            'sections': rep.longrepr.sections
+        }
+
     import py
     d = rep.__dict__.copy()
     if hasattr(rep.longrepr, 'toterminal'):
-        d['longrepr'] = str(rep.longrepr)
+        if hasattr(rep.longrepr, 'reprtraceback') \
+                and hasattr(rep.longrepr, 'reprcrash'):
+            d['longrepr'] = disassembled_report(rep)
+        else:
+            d['longrepr'] = str(rep.longrepr)
     else:
         d['longrepr'] = rep.longrepr
     for name in d:
         if isinstance(d[name], py.path.local):
             d[name] = str(d[name])
         elif name == "result":
-            d[name] = None # for now
+            d[name] = None  # for now
     return d
 
+
 def getinfodict():
     import platform
     return dict(
-        version = sys.version,
-        version_info = tuple(sys.version_info),
-        sysplatform = sys.platform,
-        platform = platform.platform(),
-        executable = sys.executable,
-        cwd = os.getcwd(),
+        version=sys.version,
+        version_info=tuple(sys.version_info),
+        sysplatform=sys.platform,
+        platform=platform.platform(),
+        executable=sys.executable,
+        cwd=os.getcwd(),
     )
 
+
 def remote_initconfig(option_dict, args):
     from _pytest.config import Config
     option_dict['plugins'].append("no:terminal")
@@ -129,16 +178,15 @@ def remote_initconfig(option_dict, args):
 
 if __name__ == '__channelexec__':
     channel = channel  # noqa
-    # python3.2 is not concurrent import safe, so let's play it safe
-    # https://bitbucket.org/hpk42/pytest/issue/347/pytest-xdist-and-python-32
-    if sys.version_info[:2] == (3,2):
-        os.environ["PYTHONDONTWRITEBYTECODE"] = "1"
-    slaveinput,args,option_dict = channel.receive()
+    slaveinput, args, option_dict = channel.receive()
     importpath = os.getcwd()
-    sys.path.insert(0, importpath) # XXX only for remote situations
-    os.environ['PYTHONPATH'] = (importpath + os.pathsep +
+    sys.path.insert(0, importpath)  # XXX only for remote situations
+    os.environ['PYTHONPATH'] = (
+        importpath + os.pathsep +
         os.environ.get('PYTHONPATH', ''))
-    #os.environ['PYTHONPATH'] = importpath
+    os.environ['PYTEST_XDIST_WORKER'] = slaveinput['slaveid']
+    os.environ['PYTEST_XDIST_WORKER_COUNT'] = str(slaveinput['slavecount'])
+    # os.environ['PYTHONPATH'] = importpath
     import py
     config = remote_initconfig(option_dict, args)
     config.slaveinput = slaveinput

xdist/report.py

@@ -0,0 +1,26 @@
+import py
+from difflib import unified_diff
+
+
+def report_collection_diff(from_collection, to_collection, from_id, to_id):
+    """Report the collected test difference between two nodes.
+
+    :returns: detailed message describing the difference between the given
+    collections, or None if they are equal.
+    """
+    if from_collection == to_collection:
+        return None
+
+    diff = unified_diff(
+        from_collection,
+        to_collection,
+        fromfile=from_id,
+        tofile=to_id,
+    )
+    error_message = py.builtin._totext(
+        'Different tests were collected between {from_id} and {to_id}. '
+        'The difference is:\n'
+        '{diff}'
+    ).format(from_id=from_id, to_id=to_id, diff='\n'.join(diff))
+    msg = "\n".join([x.rstrip() for x in error_message.split("\n")])
+    return msg

xdist/scheduler/__init__.py

@@ -0,0 +1,4 @@
+from xdist.scheduler.each import EachScheduling  # noqa
+from xdist.scheduler.load import LoadScheduling  # noqa
+from xdist.scheduler.loadscope import LoadScopeScheduling  # noqa
+from xdist.scheduler.filescope import LoadFileScheduling  # noqa

xdist/scheduler/each.py

@@ -0,0 +1,129 @@
+from py.log import Producer
+
+from xdist.slavemanage import parse_spec_config
+from xdist.report import report_collection_diff
+
+
+class EachScheduling:
+    """Implement scheduling of test items on all nodes
+
+    If a node gets added after the test run is started then it is
+    assumed to replace a node which got removed before it finished
+    its collection.  In this case it will only be used if a node
+    with the same spec got removed earlier.
+
+    Any nodes added after the run is started will only get items
+    assigned if a node with a matching spec was removed before it
+    finished all its pending items.  The new node will then be
+    assigned the remaining items from the removed node.
+    """
+
+    def __init__(self, config, log=None):
+        self.config = config
+        self.numnodes = len(parse_spec_config(config))
+        self.node2collection = {}
+        self.node2pending = {}
+        self._started = []
+        self._removed2pending = {}
+        if log is None:
+            self.log = Producer("eachsched")
+        else:
+            self.log = log.eachsched
+        self.collection_is_completed = False
+
+    @property
+    def nodes(self):
+        """A list of all nodes in the scheduler."""
+        return list(self.node2pending.keys())
+
+    @property
+    def tests_finished(self):
+        if not self.collection_is_completed:
+            return False
+        if self._removed2pending:
+            return False
+        for pending in self.node2pending.values():
+            if len(pending) >= 2:
+                return False
+        return True
+
+    @property
+    def has_pending(self):
+        """Return True if there are pending test items
+
+        This indicates that collection has finished and nodes are
+        still processing test items, so this can be thought of as
+        "the scheduler is active".
+        """
+        for pending in self.node2pending.values():
+            if pending:
+                return True
+        return False
+
+    def add_node(self, node):
+        assert node not in self.node2pending
+        self.node2pending[node] = []
+
+    def add_node_collection(self, node, collection):
+        """Add the collected test items from a node
+
+        Collection is complete once all nodes have submitted their
+        collection.  In this case its pending list is set to an empty
+        list.  When the collection is already completed this
+        submission is from a node which was restarted to replace a
+        dead node.  In this case we already assign the pending items
+        here.  In either case ``.schedule()`` will instruct the
+        node to start running the required tests.
+        """
+        assert node in self.node2pending
+        if not self.collection_is_completed:
+            self.node2collection[node] = list(collection)
+            self.node2pending[node] = []
+            if len(self.node2collection) >= self.numnodes:
+                self.collection_is_completed = True
+        elif self._removed2pending:
+            for deadnode in self._removed2pending:
+                if deadnode.gateway.spec == node.gateway.spec:
+                    dead_collection = self.node2collection[deadnode]
+                    if collection != dead_collection:
+                        msg = report_collection_diff(dead_collection,
+                                                     collection,
+                                                     deadnode.gateway.id,
+                                                     node.gateway.id)
+                        self.log(msg)
+                        return
+                    pending = self._removed2pending.pop(deadnode)
+                    self.node2pending[node] = pending
+                    break
+
+    def mark_test_complete(self, node, item_index, duration=0):
+        self.node2pending[node].remove(item_index)
+
+    def remove_node(self, node):
+        # KeyError if we didn't get an add_node() yet
+        pending = self.node2pending.pop(node)
+        if not pending:
+            return
+        crashitem = self.node2collection[node][pending.pop(0)]
+        if pending:
+            self._removed2pending[node] = pending
+        return crashitem
+
+    def schedule(self):
+        """Schedule the test items on the nodes
+
+        If the node's pending list is empty it is a new node which
+        needs to run all the tests.  If the pending list is already
+        populated (by ``.add_node_collection()``) then it replaces a
+        dead node and we only need to run those tests.
+        """
+        assert self.collection_is_completed
+        for node, pending in self.node2pending.items():
+            if node in self._started:
+                continue
+            if not pending:
+                pending[:] = range(len(self.node2collection[node]))
+                node.send_runtest_all()
+            else:
+                node.send_runtest_some(pending)
+            self._started.append(node)

xdist/scheduler/filescope.py

@@ -0,0 +1,52 @@
+from . import LoadScopeScheduling
+from py.log import Producer
+
+
+class LoadFileScheduling(LoadScopeScheduling):
+    """Implement load scheduling across nodes, but grouping test test file.
+
+    This distributes the tests collected across all nodes so each test is run
+    just once.  All nodes collect and submit the list of tests and when all
+    collections are received it is verified they are identical collections.
+    Then the collection gets divided up in work units, grouped by test file,
+    and those work units get submitted to nodes.  Whenever a node finishes an
+    item, it calls ``.mark_test_complete()`` which will trigger the scheduler
+    to assign more work units if the number of pending tests for the node falls
+    below a low-watermark.
+
+    When created, ``numnodes`` defines how many nodes are expected to submit a
+    collection. This is used to know when all nodes have finished collection.
+
+    This class behaves very much like LoadScopeScheduling, but with a file-level scope.
+    """
+
+    def __init(self, config, log=None):
+        super(LoadFileScheduling, self).__init__(config, log)
+        if log is None:
+            self.log = Producer('loadfilesched')
+        else:
+            self.log = log.loadfilesched
+
+    def _split_scope(self, nodeid):
+        """Determine the scope (grouping) of a nodeid.
+
+        There are usually 3 cases for a nodeid::
+
+            example/loadsuite/test/test_beta.py::test_beta0
+            example/loadsuite/test/test_delta.py::Delta1::test_delta0
+            example/loadsuite/epsilon/__init__.py::epsilon.epsilon
+
+        #. Function in a test module.
+        #. Method of a class in a test module.
+        #. Doctest in a function in a package.
+
+        This function will group tests with the scope determined by splitting
+        the first ``::`` from the left. That is, test will be grouped in a
+        single work unit when they reside in the same file.
+         In the above example, scopes will be::
+
+            example/loadsuite/test/test_beta.py
+            example/loadsuite/test/test_delta.py
+            example/loadsuite/epsilon/__init__.py
+        """
+        return nodeid.split('::', 1)[0]

xdist/scheduler/load.py

@@ -0,0 +1,288 @@
+from itertools import cycle
+
+from py.log import Producer
+from _pytest.runner import CollectReport
+
+from xdist.slavemanage import parse_spec_config
+from xdist.report import report_collection_diff
+
+
+class LoadScheduling:
+    """Implement load scheduling across nodes.
+
+    This distributes the tests collected across all nodes so each test
+    is run just once.  All nodes collect and submit the test suite and
+    when all collections are received it is verified they are
+    identical collections.  Then the collection gets divided up in
+    chunks and chunks get submitted to nodes.  Whenever a node finishes
+    an item, it calls ``.mark_test_complete()`` which will trigger the
+    scheduler to assign more tests if the number of pending tests for
+    the node falls below a low-watermark.
+
+    When created, ``numnodes`` defines how many nodes are expected to
+    submit a collection. This is used to know when all nodes have
+    finished collection or how large the chunks need to be created.
+
+    Attributes:
+
+    :numnodes: The expected number of nodes taking part.  The actual
+       number of nodes will vary during the scheduler's lifetime as
+       nodes are added by the DSession as they are brought up and
+       removed either because of a dead node or normal shutdown.  This
+       number is primarily used to know when the initial collection is
+       completed.
+
+    :node2collection: Map of nodes and their test collection.  All
+       collections should always be identical.
+
+    :node2pending: Map of nodes and the indices of their pending
+       tests.  The indices are an index into ``.pending`` (which is
+       identical to their own collection stored in
+       ``.node2collection``).
+
+    :collection: The one collection once it is validated to be
+       identical between all the nodes.  It is initialised to None
+       until ``.schedule()`` is called.
+
+    :pending: List of indices of globally pending tests.  These are
+       tests which have not yet been allocated to a chunk for a node
+       to process.
+
+    :log: A py.log.Producer instance.
+
+    :config: Config object, used for handling hooks.
+    """
+
+    def __init__(self, config, log=None):
+        self.numnodes = len(parse_spec_config(config))
+        self.node2collection = {}
+        self.node2pending = {}
+        self.pending = []
+        self.collection = None
+        if log is None:
+            self.log = Producer("loadsched")
+        else:
+            self.log = log.loadsched
+        self.config = config
+
+    @property
+    def nodes(self):
+        """A list of all nodes in the scheduler."""
+        return list(self.node2pending.keys())
+
+    @property
+    def collection_is_completed(self):
+        """Boolean indication initial test collection is complete.
+
+        This is a boolean indicating all initial participating nodes
+        have finished collection.  The required number of initial
+        nodes is defined by ``.numnodes``.
+        """
+        return len(self.node2collection) >= self.numnodes
+
+    @property
+    def tests_finished(self):
+        """Return True if all tests have been executed by the nodes."""
+        if not self.collection_is_completed:
+            return False
+        if self.pending:
+            return False
+        for pending in self.node2pending.values():
+            if len(pending) >= 2:
+                return False
+        return True
+
+    @property
+    def has_pending(self):
+        """Return True if there are pending test items
+
+        This indicates that collection has finished and nodes are
+        still processing test items, so this can be thought of as
+        "the scheduler is active".
+        """
+        if self.pending:
+            return True
+        for pending in self.node2pending.values():
+            if pending:
+                return True
+        return False
+
+    def add_node(self, node):
+        """Add a new node to the scheduler.
+
+        From now on the node will be allocated chunks of tests to
+        execute.
+
+        Called by the ``DSession.slave_slaveready`` hook when it
+        successfully bootstraps a new node.
+        """
+        assert node not in self.node2pending
+        self.node2pending[node] = []
+
+    def add_node_collection(self, node, collection):
+        """Add the collected test items from a node
+
+        The collection is stored in the ``.node2collection`` map.
+        Called by the ``DSession.slave_collectionfinish`` hook.
+        """
+        assert node in self.node2pending
+        if self.collection_is_completed:
+            # A new node has been added later, perhaps an original one died.
+            # .schedule() should have
+            # been called by now
+            assert self.collection
+            if collection != self.collection:
+                other_node = next(iter(self.node2collection.keys()))
+                msg = report_collection_diff(self.collection,
+                                             collection,
+                                             other_node.gateway.id,
+                                             node.gateway.id)
+                self.log(msg)
+                return
+        self.node2collection[node] = list(collection)
+
+    def mark_test_complete(self, node, item_index, duration=0):
+        """Mark test item as completed by node
+
+        The duration it took to execute the item is used as a hint to
+        the scheduler.
+
+        This is called by the ``DSession.slave_testreport`` hook.
+        """
+        self.node2pending[node].remove(item_index)
+        self.check_schedule(node, duration=duration)
+
+    def check_schedule(self, node, duration=0):
+        """Maybe schedule new items on the node
+
+        If there are any globally pending nodes left then this will
+        check if the given node should be given any more tests.  The
+        ``duration`` of the last test is optionally used as a
+        heuristic to influence how many tests the node is assigned.
+        """
+        if node.shutting_down:
+            return
+
+        if self.pending:
+            # how many nodes do we have?
+            num_nodes = len(self.node2pending)
+            # if our node goes below a heuristic minimum, fill it out to
+            # heuristic maximum
+            items_per_node_min = max(2, len(self.pending) // num_nodes // 4)
+            items_per_node_max = max(2, len(self.pending) // num_nodes // 2)
+            node_pending = self.node2pending[node]
+            if len(node_pending) < items_per_node_min:
+                if duration >= 0.1 and len(node_pending) >= 2:
+                    # seems the node is doing long-running tests
+                    # and has enough items to continue
+                    # so let's rather wait with sending new items
+                    return
+                num_send = items_per_node_max - len(node_pending)
+                self._send_tests(node, num_send)
+        self.log("num items waiting for node:", len(self.pending))
+
+    def remove_node(self, node):
+        """Remove a node from the scheduler
+
+        This should be called either when the node crashed or at
+        shutdown time.  In the former case any pending items assigned
+        to the node will be re-scheduled.  Called by the
+        ``DSession.slave_slavefinished`` and
+        ``DSession.slave_errordown`` hooks.
+
+        Return the item which was being executing while the node
+        crashed or None if the node has no more pending items.
+
+        """
+        pending = self.node2pending.pop(node)
+        if not pending:
+            return
+
+        # The node crashed, reassing pending items
+        crashitem = self.collection[pending.pop(0)]
+        self.pending.extend(pending)
+        for node in self.node2pending:
+            self.check_schedule(node)
+        return crashitem
+
+    def schedule(self):
+        """Initiate distribution of the test collection
+
+        Initiate scheduling of the items across the nodes.  If this
+        gets called again later it behaves the same as calling
+        ``.check_schedule()`` on all nodes so that newly added nodes
+        will start to be used.
+
+        This is called by the ``DSession.slave_collectionfinish`` hook
+        if ``.collection_is_completed`` is True.
+        """
+        assert self.collection_is_completed
+
+        # Initial distribution already happened, reschedule on all nodes
+        if self.collection is not None:
+            for node in self.nodes:
+                self.check_schedule(node)
+            return
+
+        # XXX allow nodes to have different collections
+        if not self._check_nodes_have_same_collection():
+            self.log('**Different tests collected, aborting run**')
+            return
+
+        # Collections are identical, create the index of pending items.
+        self.collection = list(self.node2collection.values())[0]
+        self.pending[:] = range(len(self.collection))
+        if not self.collection:
+            return
+
+        # Send a batch of tests to run. If we don't have at least two
+        # tests per node, we have to send them all so that we can send
+        # shutdown signals and get all nodes working.
+        initial_batch = max(len(self.pending) // 4,
+                            2 * len(self.nodes))
+
+        # distribute tests round-robin up to the batch size
+        # (or until we run out)
+        nodes = cycle(self.nodes)
+        for i in range(initial_batch):
+            self._send_tests(next(nodes), 1)
+
+        if not self.pending:
+            # initial distribution sent all tests, start node shutdown
+            for node in self.nodes:
+                node.shutdown()
+
+    def _send_tests(self, node, num):
+        tests_per_node = self.pending[:num]
+        if tests_per_node:
+            del self.pending[:num]
+            self.node2pending[node].extend(tests_per_node)
+            node.send_runtest_some(tests_per_node)
+
+    def _check_nodes_have_same_collection(self):
+        """Return True if all nodes have collected the same items.
+
+        If collections differ, this method returns False while logging
+        the collection differences and posting collection errors to
+        pytest_collectreport hook.
+        """
+        node_collection_items = list(self.node2collection.items())
+        first_node, col = node_collection_items[0]
+        same_collection = True
+        for node, collection in node_collection_items[1:]:
+            msg = report_collection_diff(
+                col,
+                collection,
+                first_node.gateway.id,
+                node.gateway.id,
+            )
+            if msg:
+                same_collection = False
+                self.log(msg)
+                if self.config is not None:
+                    rep = CollectReport(
+                        node.gateway.id, 'failed',
+                        longrepr=msg, result=[])
+                    self.config.hook.pytest_collectreport(report=rep)
+
+        return same_collection

xdist/scheduler/loadscope.py

@@ -0,0 +1,423 @@
+from collections import OrderedDict
+
+from _pytest.runner import CollectReport
+from py.log import Producer
+from xdist.report import report_collection_diff
+from xdist.slavemanage import parse_spec_config
+
+
+class LoadScopeScheduling:
+    """Implement load scheduling across nodes, but grouping test by scope.
+
+    This distributes the tests collected across all nodes so each test is run
+    just once.  All nodes collect and submit the list of tests and when all
+    collections are received it is verified they are identical collections.
+    Then the collection gets divided up in work units, grouped by test scope,
+    and those work units get submitted to nodes.  Whenever a node finishes an
+    item, it calls ``.mark_test_complete()`` which will trigger the scheduler
+    to assign more work units if the number of pending tests for the node falls
+    below a low-watermark.
+
+    When created, ``numnodes`` defines how many nodes are expected to submit a
+    collection. This is used to know when all nodes have finished collection.
+
+    Attributes:
+
+    :numnodes: The expected number of nodes taking part.  The actual number of
+       nodes will vary during the scheduler's lifetime as nodes are added by
+       the DSession as they are brought up and removed either because of a dead
+       node or normal shutdown.  This number is primarily used to know when the
+       initial collection is completed.
+
+    :collection: The final list of tests collected by all nodes once it is
+       validated to be identical between all the nodes.  It is initialised to
+       None until ``.schedule()`` is called.
+
+    :workqueue: Ordered dictionary that maps all available scopes with their
+       associated tests (nodeid). Nodeids are in turn associated with their
+       completion status. One entry of the workqueue is called a work unit.
+       In turn, a collection of work unit is called a workload.
+
+       ::
+
+            workqueue = {
+                '<full>/<path>/<to>/test_module.py': {
+                    '<full>/<path>/<to>/test_module.py::test_case1': False,
+                    '<full>/<path>/<to>/test_module.py::test_case2': False,
+                    (...)
+                },
+                (...)
+            }
+
+    :assigned_work: Ordered dictionary that maps worker nodes with their
+       assigned work units.
+
+       ::
+
+            assigned_work = {
+                '<worker node A>': {
+                    '<full>/<path>/<to>/test_module.py': {
+                        '<full>/<path>/<to>/test_module.py::test_case1': False,
+                        '<full>/<path>/<to>/test_module.py::test_case2': False,
+                        (...)
+                    },
+                    (...)
+                },
+                (...)
+            }
+
+    :registered_collections: Ordered dictionary that maps worker nodes with
+       their collection of tests gathered during test discovery.
+
+       ::
+
+            registered_collections = {
+                '<worker node A>': [
+                    '<full>/<path>/<to>/test_module.py::test_case1',
+                    '<full>/<path>/<to>/test_module.py::test_case2',
+                ],
+                (...)
+            }
+
+    :log: A py.log.Producer instance.
+
+    :config: Config object, used for handling hooks.
+    """
+
+    def __init__(self, config, log=None):
+        self.numnodes = len(parse_spec_config(config))
+        self.collection = None
+
+        self.workqueue = OrderedDict()
+        self.assigned_work = OrderedDict()
+        self.registered_collections = OrderedDict()
+
+        if log is None:
+            self.log = Producer('loadscopesched')
+        else:
+            self.log = log.loadscopesched
+
+        self.config = config
+
+    @property
+    def nodes(self):
+        """A list of all active nodes in the scheduler."""
+        return list(self.assigned_work.keys())
+
+    @property
+    def collection_is_completed(self):
+        """Boolean indication initial test collection is complete.
+
+        This is a boolean indicating all initial participating nodes have
+        finished collection.  The required number of initial nodes is defined
+        by ``.numnodes``.
+        """
+        return len(self.registered_collections) >= self.numnodes
+
+    @property
+    def tests_finished(self):
+        """Return True if all tests have been executed by the nodes."""
+        if not self.collection_is_completed:
+            return False
+
+        if self.workqueue:
+            return False
+
+        for assigned_unit in self.assigned_work.values():
+            if self._pending_of(assigned_unit) >= 2:
+                return False
+
+        return True
+
+    @property
+    def has_pending(self):
+        """Return True if there are pending test items.
+
+        This indicates that collection has finished and nodes are still
+        processing test items, so this can be thought of as
+        "the scheduler is active".
+        """
+        if self.workqueue:
+            return True
+
+        for assigned_unit in self.assigned_work.values():
+            if self._pending_of(assigned_unit) > 0:
+                return True
+
+        return False
+
+    def add_node(self, node):
+        """Add a new node to the scheduler.
+
+        From now on the node will be assigned work units to be executed.
+
+        Called by the ``DSession.slave_slaveready`` hook when it successfully
+        bootstraps a new node.
+        """
+        assert node not in self.assigned_work
+        self.assigned_work[node] = OrderedDict()
+
+    def remove_node(self, node):
+        """Remove a node from the scheduler.
+
+        This should be called either when the node crashed or at shutdown time.
+        In the former case any pending items assigned to the node will be
+        re-scheduled.
+
+        Called by the hooks:
+
+        - ``DSession.slave_slavefinished``.
+        - ``DSession.slave_errordown``.
+
+        Return the item being executed while the node crashed or None if the
+        node has no more pending items.
+        """
+        workload = self.assigned_work.pop(node)
+        if not self._pending_of(workload):
+            return None
+
+        # The node crashed, identify test that crashed
+        for work_unit in workload.values():
+            for nodeid, completed in work_unit.items():
+                if not completed:
+                    crashitem = nodeid
+                    break
+            else:
+                continue
+            break
+        else:
+            raise RuntimeError(
+                'Unable to identify crashitem on a workload with '
+                'pending items'
+            )
+
+        # Made uncompleted work unit available again
+        self.workqueue.update(workload)
+
+        for node in self.assigned_work:
+            self._reschedule(node)
+
+        return crashitem
+
+    def add_node_collection(self, node, collection):
+        """Add the collected test items from a node.
+
+        The collection is stored in the ``.registered_collections`` dictionary.
+
+        Called by the hook:
+
+        - ``DSession.slave_collectionfinish``.
+        """
+
+        # Check that add_node() was called on the node before
+        assert node in self.assigned_work
+
+        # A new node has been added later, perhaps an original one died.
+        if self.collection_is_completed:
+
+            # Assert that .schedule() should have been called by now
+            assert self.collection
+
+            # Check that the new collection matches the official collection
+            if collection != self.collection:
+
+                other_node = next(iter(self.registered_collections.keys()))
+
+                msg = report_collection_diff(
+                    self.collection,
+                    collection,
+                    other_node.gateway.id,
+                    node.gateway.id
+                )
+                self.log(msg)
+                return
+
+        self.registered_collections[node] = list(collection)
+
+    def mark_test_complete(self, node, item_index, duration=0):
+        """Mark test item as completed by node.
+
+        Called by the hook:
+
+        - ``DSession.slave_testreport``.
+        """
+        nodeid = self.registered_collections[node][item_index]
+        scope = self._split_scope(nodeid)
+
+        self.assigned_work[node][scope][nodeid] = True
+        self._reschedule(node)
+
+    def _assign_work_unit(self, node):
+        """Assign a work unit to a node."""
+        assert self.workqueue
+
+        # Grab a unit of work
+        scope, work_unit = self.workqueue.popitem(last=False)
+
+        # Keep track of the assigned work
+        assigned_to_node = self.assigned_work.setdefault(
+            node, default=OrderedDict()
+        )
+        assigned_to_node[scope] = work_unit
+
+        # Ask the node to execute the workload
+        worker_collection = self.registered_collections[node]
+        nodeids_indexes = [
+            worker_collection.index(nodeid)
+            for nodeid, completed in work_unit.items()
+            if not completed
+        ]
+
+        node.send_runtest_some(nodeids_indexes)
+
+    def _split_scope(self, nodeid):
+        """Determine the scope (grouping) of a nodeid.
+
+        There are usually 3 cases for a nodeid::
+
+            example/loadsuite/test/test_beta.py::test_beta0
+            example/loadsuite/test/test_delta.py::Delta1::test_delta0
+            example/loadsuite/epsilon/__init__.py::epsilon.epsilon
+
+        #. Function in a test module.
+        #. Method of a class in a test module.
+        #. Doctest in a function in a package.
+
+        This function will group tests with the scope determined by splitting
+        the first ``::`` from the right. That is, classes will be grouped in a
+        single work unit, and functions from a test module will be grouped by
+        their module. In the above example, scopes will be::
+
+            example/loadsuite/test/test_beta.py
+            example/loadsuite/test/test_delta.py::Delta1
+            example/loadsuite/epsilon/__init__.py
+        """
+        return nodeid.rsplit('::', 1)[0]
+
+    def _pending_of(self, workload):
+        """Return the number of pending tests in a workload."""
+        pending = sum(
+            list(scope.values()).count(False)
+            for scope in workload.values()
+        )
+        return pending
+
+    def _reschedule(self, node):
+        """Maybe schedule new items on the node.
+
+        If there are any globally pending work units left then this will check
+        if the given node should be given any more tests.
+        """
+
+        # Do not add more work to a node shutting down
+        if node.shutting_down:
+            return
+
+        # Check that more work is available
+        if not self.workqueue:
+            return
+
+        self.log('Number of units waiting for node:', len(self.workqueue))
+
+        # Check that the node is almost depleted of work
+        # 2: Heuristic of minimum tests to enqueue more work
+        if self._pending_of(self.assigned_work[node]) > 2:
+            return
+
+        # Pop one unit of work and assign it
+        self._assign_work_unit(node)
+
+    def schedule(self):
+        """Initiate distribution of the test collection.
+
+        Initiate scheduling of the items across the nodes.  If this gets called
+        again later it behaves the same as calling ``._reschedule()`` on all
+        nodes so that newly added nodes will start to be used.
+
+        If ``.collection_is_completed`` is True, this is called by the hook:
+
+        - ``DSession.slave_collectionfinish``.
+        """
+        assert self.collection_is_completed
+
+        # Initial distribution already happened, reschedule on all nodes
+        if self.collection is not None:
+            for node in self.nodes:
+                self._reschedule(node)
+            return
+
+        # Check that all nodes collected the same tests
+        if not self._check_nodes_have_same_collection():
+            self.log('**Different tests collected, aborting run**')
+            return
+
+        # Collections are identical, create the final list of items
+        self.collection = list(
+            next(iter(self.registered_collections.values()))
+        )
+        if not self.collection:
+            return
+
+        # Determine chunks of work (scopes)
+        for nodeid in self.collection:
+            scope = self._split_scope(nodeid)
+            work_unit = self.workqueue.setdefault(scope, default=OrderedDict())
+            work_unit[nodeid] = False
+
+        # Avoid having more workers than work
+        extra_nodes = len(self.nodes) - len(self.workqueue)
+
+        if extra_nodes > 0:
+            self.log('Shuting down {0} nodes'.format(extra_nodes))
+
+            for _ in range(extra_nodes):
+                unused_node, assigned = self.assigned_work.popitem(last=True)
+
+                self.log('Shuting down unused node {0}'.format(unused_node))
+                unused_node.shutdown()
+
+        # Assign initial workload
+        for node in self.nodes:
+            self._assign_work_unit(node)
+
+        # Initial distribution sent all tests, start node shutdown
+        if not self.workqueue:
+            for node in self.nodes:
+                node.shutdown()
+
+    def _check_nodes_have_same_collection(self):
+        """Return True if all nodes have collected the same items.
+
+        If collections differ, this method returns False while logging
+        the collection differences and posting collection errors to
+        pytest_collectreport hook.
+        """
+        node_collection_items = list(self.registered_collections.items())
+        first_node, col = node_collection_items[0]
+        same_collection = True
+
+        for node, collection in node_collection_items[1:]:
+            msg = report_collection_diff(
+                col,
+                collection,
+                first_node.gateway.id,
+                node.gateway.id,
+            )
+            if not msg:
+                continue
+
+            same_collection = False
+            self.log(msg)
+
+            if self.config is None:
+                continue
+
+            rep = CollectReport(
+                node.gateway.id,
+                'failed',
+                longrepr=msg,
+                result=[]
+            )
+            self.config.hook.pytest_collectreport(report=rep)
+
+        return same_collection

xdist/slavemanage.py

@@ -1,16 +1,35 @@
 import fnmatch
 import os
+import re
 
 import py
 import pytest
 import execnet
 import xdist.remote
 
-from _pytest import runner # XXX load dynamically
+from _pytest import runner  # XXX load dynamically
+
+
+def parse_spec_config(config):
+    xspeclist = []
+    for xspec in config.getvalue("tx"):
+        i = xspec.find("*")
+        try:
+            num = int(xspec[:i])
+        except ValueError:
+            xspeclist.append(xspec)
+        else:
+            xspeclist.extend([xspec[i + 1:]] * num)
+    if not xspeclist:
+        raise pytest.UsageError(
+            "MISSING test execution (tx) nodes: please specify --tx")
+    return xspeclist
+
 
 class NodeManager(object):
     EXIT_TIMEOUT = 10
     DEFAULT_IGNORES = ['.*', '*.pyc', '*.pyo', '*~']
+
     def __init__(self, config, specs=None, defaultchdir="pyexecnetcache"):
         self.config = config
         self._nodesready = py.std.threading.Event()
@@ -59,19 +78,7 @@ class NodeManager(object):
         self.group.terminate(self.EXIT_TIMEOUT)
 
     def _getxspecs(self):
-        xspeclist = []
-        for xspec in self.config.getvalue("tx"):
-            i = xspec.find("*")
-            try:
-                num = int(xspec[:i])
-            except ValueError:
-                xspeclist.append(xspec)
-            else:
-                xspeclist.extend([xspec[i+1:]] * num)
-        if not xspeclist:
-            raise pytest.UsageError(
-                "MISSING test execution (tx) nodes: please specify --tx")
-        return [execnet.XSpec(x) for x in xspeclist]
+        return [execnet.XSpec(x) for x in parse_spec_config(self.config)]
 
     def _getrsyncdirs(self):
         for spec in self.specs:
@@ -79,11 +86,12 @@ class NodeManager(object):
                 break
         else:
             return []
-        import pytest, _pytest
+        import pytest
+        import _pytest
         pytestpath = pytest.__file__.rstrip("co")
         pytestdir = py.path.local(_pytest.__file__).dirpath()
         config = self.config
-        candidates = [py._pydir,pytestpath,pytestdir]
+        candidates = [py._pydir, pytestpath, pytestdir]
         candidates += config.option.rsyncdir
         rsyncroots = config.getini("rsyncdirs")
         if rsyncroots:
@@ -92,7 +100,7 @@ class NodeManager(object):
         for root in candidates:
             root = py.path.local(root).realpath()
             if not root.check():
-                raise pytest.UsageError("rsyncdir doesn't exist: %r" %(root,))
+                raise pytest.UsageError("rsyncdir doesn't exist: %r" % (root,))
             if root not in roots:
                 roots.append(root)
         return roots
@@ -124,6 +132,7 @@ class NodeManager(object):
             return
         if (spec, source) in self._rsynced_specs:
             return
+
         def finished():
             if notify:
                 notify("rsyncrootready", spec, source)
@@ -139,22 +148,23 @@ class NodeManager(object):
             gateways=[gateway],
         )
 
+
 class HostRSync(execnet.RSync):
     """ RSyncer that filters out common files
     """
     def __init__(self, sourcedir, *args, **kwargs):
         self._synced = {}
-        ignores= None
-        if 'ignores' in kwargs:
-            ignores = kwargs.pop('ignores')
-        self._ignores = ignores or []
+        self._ignores = []
+        ignores = kwargs.pop('ignores', None) or []
+        for x in ignores:
+            x = getattr(x, 'strpath', x)
+            self._ignores.append(re.compile(fnmatch.translate(x)))
         super(HostRSync, self).__init__(sourcedir=sourcedir, **kwargs)
 
     def filter(self, path):
         path = py.path.local(path)
-        for x in self._ignores:
-            x = getattr(x, 'strpath', x)
-            if fnmatch.fnmatch(path.basename, x) or fnmatch.fnmatch(path.strpath, x):
+        for cre in self._ignores:
+            if cre.match(path.basename) or cre.match(path.strpath):
                 return False
         else:
             return True
@@ -176,7 +186,7 @@ class HostRSync(execnet.RSync):
 def make_reltoroot(roots, args):
     # XXX introduce/use public API for splitting py.test args
     splitcode = "::"
-    l = []
+    result = []
     for arg in args:
         parts = arg.split(splitcode)
         fspath = py.path.local(parts[0])
@@ -187,8 +197,9 @@ def make_reltoroot(roots, args):
                 break
         else:
             raise ValueError("arg %s not relative to an rsync root" % (arg,))
-        l.append(splitcode.join(parts))
-    return l
+        result.append(splitcode.join(parts))
+    return result
+
 
 class SlaveController(object):
     ENDMARK = -1
@@ -198,14 +209,20 @@ class SlaveController(object):
         self.putevent = putevent
         self.gateway = gateway
         self.config = config
-        self.slaveinput = {'slaveid': gateway.id}
+        self.slaveinput = {'slaveid': gateway.id,
+                           'slavecount': len(nodemanager.specs)}
         self._down = False
+        self._shutdown_sent = False
         self.log = py.log.Producer("slavectl-%s" % gateway.id)
         if not self.config.option.debug:
             py.log.setconsumer(self.log._keywords, None)
 
     def __repr__(self):
-        return "<%s %s>" %(self.__class__.__name__, self.gateway.id,)
+        return "<%s %s>" % (self.__class__.__name__, self.gateway.id,)
+
+    @property
+    def shutting_down(self):
+        return self._down or self._shutdown_sent
 
     def setup(self):
         self.log("setting up slave session")
@@ -216,13 +233,15 @@ class SlaveController(object):
         option_dict = vars(self.config.option)
         if spec.popen:
             name = "popen-%s" % self.gateway.id
-            basetemp = self.config._tmpdirhandler.getbasetemp()
-            option_dict['basetemp'] = str(basetemp.join(name))
+            if hasattr(self.config, '_tmpdirhandler'):
+                basetemp = self.config._tmpdirhandler.getbasetemp()
+                option_dict['basetemp'] = str(basetemp.join(name))
         self.config.hook.pytest_configure_node(node=self)
         self.channel = self.gateway.remote_exec(xdist.remote)
         self.channel.send((self.slaveinput, args, option_dict))
         if self.putevent:
-            self.channel.setcallback(self.process_from_remote,
+            self.channel.setcallback(
+                self.process_from_remote,
                 endmarker=self.ENDMARK)
 
     def ensure_teardown(self):
@@ -230,11 +249,11 @@ class SlaveController(object):
             if not self.channel.isclosed():
                 self.log("closing", self.channel)
                 self.channel.close()
-            #del self.channel
+            # del self.channel
         if hasattr(self, 'gateway'):
             self.log("exiting", self.gateway)
             self.gateway.exit()
-            #del self.gateway
+            # del self.gateway
 
     def send_runtest_some(self, indices):
         self.sendcommand("runtests", indices=indices)
@@ -248,6 +267,7 @@ class SlaveController(object):
                 self.sendcommand("shutdown")
             except IOError:
                 pass
+            self._shutdown_sent = True
 
     def sendcommand(self, name, **kwargs):
         """ send a named parametrized command to the other side. """
@@ -258,7 +278,7 @@ class SlaveController(object):
         self.log("queuing %s(**%s)" % (eventname, kwargs))
         self.putevent((eventname, kwargs))
 
-    def process_from_remote(self, eventcall):
+    def process_from_remote(self, eventcall):  # noqa too complex
         """ this gets called for each object we receive from
             the other side and if the channel closes.
 
@@ -271,13 +291,13 @@ class SlaveController(object):
                 err = self.channel._getremoteerror()
                 if not self._down:
                     if not err or isinstance(err, EOFError):
-                        err = "Not properly terminated" # lost connection?
+                        err = "Not properly terminated"  # lost connection?
                     self.notify_inproc("errordown", node=self, error=err)
                     self._down = True
                 return
             eventname, kwargs = eventcall
-            if eventname in ("collectionstart"):
-                self.log("ignoring %s(%s)" %(eventname, kwargs))
+            if eventname in ("collectionstart",):
+                self.log("ignoring %s(%s)" % (eventname, kwargs))
             elif eventname == "slaveready":
                 self.notify_inproc(eventname, node=self, **kwargs)
             elif eventname == "slavefinished":
@@ -286,7 +306,8 @@ class SlaveController(object):
                 self.notify_inproc("slavefinished", node=self)
             elif eventname == "logstart":
                 self.notify_inproc(eventname, node=self, **kwargs)
-            elif eventname in ("testreport", "collectreport", "teardownreport"):
+            elif eventname in (
+                    "testreport", "collectreport", "teardownreport"):
                 item_index = kwargs.pop("item_index", None)
                 rep = unserialize_report(eventname, kwargs['data'])
                 if item_index is not None:
@@ -294,18 +315,101 @@ class SlaveController(object):
                 self.notify_inproc(eventname, node=self, rep=rep)
             elif eventname == "collectionfinish":
                 self.notify_inproc(eventname, node=self, ids=kwargs['ids'])
+            elif eventname == "runtest_protocol_complete":
+                self.notify_inproc(eventname, node=self, **kwargs)
+            elif eventname == "logwarning":
+                self.notify_inproc(eventname, message=kwargs['message'],
+                                   code=kwargs['code'], nodeid=kwargs['nodeid'],
+                                   fslocation=kwargs['nodeid'])
             else:
-                raise ValueError("unknown event: %s" %(eventname,))
+                raise ValueError("unknown event: %s" % (eventname,))
         except KeyboardInterrupt:
             # should not land in receiver-thread
             raise
-        except:
+        except:  # noqa
             excinfo = py.code.ExceptionInfo()
             py.builtin.print_("!" * 20, excinfo)
-            self.config.pluginmanager.notify_exception(excinfo)
+            self.config.notify_exception(excinfo)
+            self.shutdown()
+            self.notify_inproc("errordown", node=self, error=excinfo)
+
 
 def unserialize_report(name, reportdict):
+    def assembled_report(reportdict):
+        from _pytest._code.code import (
+            ReprEntry,
+            ReprEntryNative,
+            ReprExceptionInfo,
+            ReprFileLocation,
+            ReprFuncArgs,
+            ReprLocals,
+            ReprTraceback
+        )
+        if reportdict['longrepr']:
+            if 'reprcrash' in reportdict['longrepr'] and 'reprtraceback' in reportdict['longrepr']:
+
+                reprtraceback = reportdict['longrepr']['reprtraceback']
+                reprcrash = reportdict['longrepr']['reprcrash']
+
+                unserialized_entries = []
+                reprentry = None
+                for entry_data in reprtraceback['reprentries']:
+                    data = entry_data['data']
+                    entry_type = entry_data['type']
+                    if entry_type == 'ReprEntry':
+                        reprfuncargs = None
+                        reprfileloc = None
+                        reprlocals = None
+                        if data['reprfuncargs']:
+                            reprfuncargs = ReprFuncArgs(
+                                **data['reprfuncargs'])
+                        if data['reprfileloc']:
+                            reprfileloc = ReprFileLocation(
+                                **data['reprfileloc'])
+                        if data['reprlocals']:
+                            reprlocals = ReprLocals(
+                                data['reprlocals']['lines'])
+
+                        reprentry = ReprEntry(
+                            lines=data['lines'],
+                            reprfuncargs=reprfuncargs,
+                            reprlocals=reprlocals,
+                            filelocrepr=reprfileloc,
+                            style=data['style']
+                        )
+                    elif entry_type == 'ReprEntryNative':
+                        reprentry = ReprEntryNative(data['lines'])
+                    else:
+                        report_unserialization_failure(
+                            entry_type, name, reportdict)
+                    unserialized_entries.append(reprentry)
+                reprtraceback['reprentries'] = unserialized_entries
+
+                exception_info = ReprExceptionInfo(
+                    reprtraceback=ReprTraceback(**reprtraceback),
+                    reprcrash=ReprFileLocation(**reprcrash),
+                )
+
+                for section in reportdict['longrepr']['sections']:
+                    exception_info.addsection(*section)
+                reportdict['longrepr'] = exception_info
+        return reportdict
+
     if name == "testreport":
-        return runner.TestReport(**reportdict)
+        return runner.TestReport(**assembled_report(reportdict))
     elif name == "collectreport":
-        return runner.CollectReport(**reportdict)
+        return runner.CollectReport(**assembled_report(reportdict))
+
+
+def report_unserialization_failure(type_name, report_name, reportdict):
+    from pprint import pprint
+    url = 'https://github.com/pytest-dev/pytest-xdist/issues'
+    stream = py.io.TextIO()
+    pprint('-' * 100, stream=stream)
+    pprint('INTERNALERROR: Unknown entry type returned: %s' % type_name,
+           stream=stream)
+    pprint('report_name: %s' % report_name, stream=stream)
+    pprint(reportdict, stream=stream)
+    pprint('Please report this bug at %s' % url, stream=stream)
+    pprint('-' * 100, stream=stream)
+    assert 0, stream.getvalue()