[issue17444] multiprocessing.cpu_count() should use hw.availcpu on Mac OS X
Ronald Oussoren
report at bugs.python.org
Tue Mar 19 09:07:46 CET 2013
Ronald Oussoren added the comment:
I also like the os.cpu_count() function, the information is useful sometimes outside of multiprocessing, and calling out to external scripts to gather the information (as multiprocessing currently does) feels yucky.
That should probably be a new issue, the change in this issue fixes a real problem (the cpu count code in multiprocessing can overestimate the usable CPU count on OSX) and is a bugfix that should be backported to the stable branches.
BTW. Trent's os.cpu_count implementation also uses hw.ncpu and is therefore also broken on OSX.
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<http://bugs.python.org/issue17444>
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