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Merged
vstinner merged 4 commits into from
Oct 1, 2023
Merged

gh-109649: Use os.process_cpu_count() #110165

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6b15e90
gh-109649: Use os.process_cpu_count()
vstinner Sep 30, 2023
6c336bc
wasm_build.py: keep support with old Python
vstinner Sep 30, 2023
0cc90be
multissltests.py: keep support with old Python
vstinner Sep 30, 2023
6059dee
Complete the doc
vstinner Oct 1, 2023
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Complete the doc
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@vstinner
vstinner committed Oct 1, 2023
commit 6059deec8634e1ecb9675fb12e5ba95b348155a2
6 changes: 5 additions & 1 deletion Doc/library/concurrent.futures.rst
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Expand Up @@ -188,7 +188,7 @@ And::
ThreadPoolExecutor now reuses idle worker threads before starting
*max_workers* worker threads too.

.. versionchanged:: 3.8
.. versionchanged:: 3.13
Default value of *max_workers* is changed to
``min(32, (os.process_cpu_count() or 1) + 4)``.

Expand Down Expand Up @@ -305,6 +305,10 @@ to a :class:`ProcessPoolExecutor` will result in deadlock.
different start method. See the :func:`os.fork` documentation for
further explanation.

.. versionchanged:: 3.13
*max_workers* uses :func:`os.process_cpu_count` by default, instead of
:func:`os.cpu_count`.

.. _processpoolexecutor-example:

ProcessPoolExecutor Example
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4 changes: 4 additions & 0 deletions Doc/library/multiprocessing.rst
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Expand Up @@ -2249,6 +2249,10 @@ with the :class:`Pool` class.
.. versionadded:: 3.4
*context*

.. versionchanged:: 3.13
*processes* uses :func:`os.process_cpu_count` by default, instead of
:func:`os.cpu_count`.

.. note::

Worker processes within a :class:`Pool` typically live for the complete
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3 changes: 2 additions & 1 deletion Doc/whatsnew/3.13.rst
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Expand Up @@ -93,7 +93,8 @@ Other Language Changes

* :mod:`multiprocessing`, :mod:`concurrent.futures`, :mod:`compileall`:
Replace :func:`os.cpu_count` with :func:`os.process_cpu_count` to select the
default number of worker threads and processes.
default number of worker threads and processes. Get the CPU affinity
if supported.
(Contributed by Victor Stinner in :gh:`109649`.)


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3 changes: 2 additions & 1 deletion Misc/NEWS.d/next/Library/2023-10-01-01-47-21.gh-issue-109649.BizOaD.rst
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@@ -1,3 +1,4 @@
:mod:`multiprocessing`, :mod:`concurrent.futures`, :mod:`compileall`:
Replace :func:`os.cpu_count` with :func:`os.process_cpu_count` to select the
default number of worker threads and processes. Patch by Victor Stinner.
default number of worker threads and processes. Get the CPU affinity if
supported. Patch by Victor Stinner.