Support OpenBSD and NetBSD

src/xdist/plugin.py

@@ -6,11 +6,7 @@ import pytest
 
 
 def auto_detect_cpus():
-    try:
-        n = psutil.cpu_count(logical=False)
-    except NotImplementedError:
-        return 1
-    return n if n else 1
+    return psutil.cpu_count(logical=False) or psutil.cpu_count() or 1
 
 
 class AutoInt(int):

testing/test_plugin.py

@@ -51,10 +51,7 @@ def test_auto_detect_cpus(testdir, monkeypatch):
     assert config.getoption("usepdb")
     assert config.getoption("numprocesses") == 0
 
-    def cpu_count_not_implemented(logical=True):
-        raise NotImplementedError
-
-    monkeypatch.setattr(psutil, "cpu_count", cpu_count_not_implemented)
+    monkeypatch.setattr(psutil, "cpu_count", lambda logical=True: None)
     config = testdir.parseconfigure("-nauto")
     assert config.getoption("numprocesses") == 1