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gh-84559: Change the multiprocessing start method default to `forkserver` by gpshead · Pull Request #101556 · python/cpython · GitHub
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gh-84559: Change the multiprocessing start method default to forkserver#101556

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gpshead merged 14 commits into
python:mainfrom
gpshead:multiprocessing/default-start-method-3.14
Sep 26, 2024
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gh-84559: Change the multiprocessing start method default to forkserver#101556
gpshead merged 14 commits into
python:mainfrom
gpshead:multiprocessing/default-start-method-3.14

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gpshead commented Feb 4, 2023 •
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We change the default from fork to forkserver or spawn. See the issue for details.

This change is intended for Python 3.14.

TODO:

  • The 3.13 release branch has been made, thus starting 3.14 in main.
  • NEWS entry added.
  • Documentation updates in:
    • library/multiprocessing.rst
    • library/concurrent.futures.rst
    • whatsnew/3.14.rst

pythongh-84559: Change the default multiprocessing start method. …
c5277b7
We drop 'fork' in favor of 'forkserver' or 'spawn'. See the issue for details.
bedevere-bot mentioned this pull request Feb 4, 2023
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gpshead self-assigned this Sep 12, 2023
gpshead marked this pull request as ready for review September 24, 2024 21:24
gpshead requested a review from hugovk September 24, 2024 21:25
gpshead changed the title gh-84559: multiprocessing start method default away from fork gh-84559: Change the multiprocessing start method default to forkserver Sep 24, 2024
gpshead added 3.14 bugs and security fixes docs Documentation in the Doc dir stdlib Standard Library Python modules in the Lib/ directory and removed DO-NOT-MERGE labels Sep 24, 2024
hugovk reviewed Sep 25, 2024
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Comment thread Misc/NEWS.d/next/Library/2024-09-19-00-09-48.gh-issue-84559.IrxvQe.rst Outdated Show resolved Hide resolved

gpshead commented Sep 25, 2024

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@ericsnowcurrently could you review? (likely an easy one)

ericsnowcurrently approved these changes Sep 26, 2024
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality Hide comment

LGTM

Thanks for following this through!

Comment thread Lib/test/support/__init__.py Show resolved Hide resolved
Comment thread Lib/test/_test_multiprocessing.py Show resolved Hide resolved
gpshead added the 🔨 test-with-buildbots Test PR w/ buildbots; report in status section label Sep 26, 2024

bedevere-bot commented Sep 26, 2024

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🤖 New build scheduled with the buildbot fleet by @gpshead for commit 668559c 🤖

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

bedevere-bot removed the 🔨 test-with-buildbots Test PR w/ buildbots; report in status section label Sep 26, 2024
gpshead merged commit b65f2cd into python:main Sep 26, 2024
gpshead deleted the multiprocessing/default-start-method-3.14 branch September 26, 2024 23:57
eendebakpt mentioned this pull request Jan 6, 2025
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gi0baro mentioned this pull request Oct 7, 2025
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eendebakpt mentioned this pull request Oct 27, 2025
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coderabbitai Bot mentioned this pull request Apr 23, 2026
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