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| author | Inada Naoki <songofacandy@gmail.com> | 2019-05-28 12:02:52 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2019-05-28 12:02:52 (GMT) |
| commit | 9a7e5b1b42abcedb895b1ce49d83fe067d01835c (patch) | |
| tree | ed8b62255e53b785f13dd4130b2d22540b352aed /Doc/library/concurrent.futures.rst | |
| parent | 293e9f86b8d10fcd88d6a2015babae76e9a8bd8f (diff) | |
| download | cpython-9a7e5b1b42abcedb895b1ce49d83fe067d01835c.zip cpython-9a7e5b1b42abcedb895b1ce49d83fe067d01835c.tar.gz cpython-9a7e5b1b42abcedb895b1ce49d83fe067d01835c.tar.bz2 | |
bpo-35279: reduce default max_workers of ThreadPoolExecutor (GH-13618)
Diffstat (limited to 'Doc/library/concurrent.futures.rst')
| -rw-r--r-- | Doc/library/concurrent.futures.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Doc/library/concurrent.futures.rst b/Doc/library/concurrent.futures.rst index ffc29d7..f2491dd 100644 --- a/Doc/library/concurrent.futures.rst +++ b/Doc/library/concurrent.futures.rst @@ -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: |