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bpo-35279: reduce default max_workers of ThreadPoolExecutor (GH-13618)

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Inada Naoki 2019-05-28 21:02:52 +09:00 • committed by GitHub
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Doc/library/concurrent.futures.rst
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@ -159,6 +159,15 @@ And::
.. versionchanged:: 3.7
Added the *initializer* and *initargs* arguments.
.. versionchanged:: 3.8
Default value of *max_workers* is changed to ``min(32, os.cpu_count() + 4)``.
This default value preserves at least 5 workers for I/O bound tasks.
It utilizes at most 32 CPU cores for CPU bound tasks which release the GIL.
And it avoids using very large resources implicitly on many-core machines.
ThreadPoolExecutor now reuses idle worker threads before starting
*max_workers* worker threads too.
.. _threadpoolexecutor-example: