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[3.12] gh-109649: Enhance os.cpu_count() documentation #110169

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Oct 2, 2023
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[3.12] gh-109649: Enhance os.cpu_count() documentation #110169

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gh-109649: Enhance os.cpu_count() documentation
vstinner Oct 1, 2023
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Restore removed text
vstinner Oct 1, 2023
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16 changes: 9 additions & 7 deletions Doc/library/os.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -5141,8 +5141,10 @@ operating system.

.. function:: sched_getaffinity(pid, /)

Return the set of CPUs the process with PID *pid* (or the current process
if zero) is restricted to.
Return the set of CPUs the process with PID *pid* is restricted to.

If *pid* is zero, return the set of CPUs the calling thread of the current
process is restricted to.


.. _os-path:
Expand Down Expand Up @@ -5183,12 +5185,12 @@ Miscellaneous System Information

.. function:: cpu_count()

Return the number of CPUs in the system. Returns ``None`` if undetermined.

This number is not equivalent to the number of CPUs the current process can
use. The number of usable CPUs can be obtained with
``len(os.sched_getaffinity(0))``
Return the number of logical CPUs in the system. Returns ``None`` if
undetermined.

This number is not equivalent to the number of logical CPUs the current
process can use. ``len(os.sched_getaffinity(0))`` gets the number of logical
CPUs the calling thread of the current process is restricted to

.. versionadded:: 3.4

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1 change: 1 addition & 0 deletions Lib/test/test_posix.py
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Expand Up @@ -1205,6 +1205,7 @@ def test_sched_getaffinity(self):
@requires_sched_affinity
def test_sched_setaffinity(self):
mask = posix.sched_getaffinity(0)
self.addCleanup(posix.sched_setaffinity, 0, list(mask))
if len(mask) > 1:
# Empty masks are forbidden
mask.pop()
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