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gh-84559: Change the multiprocessing start method default to forkserver #101556

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Merged
merged 14 commits into from
Sep 26, 2024
Merged

gh-84559: Change the multiprocessing start method default to forkserver #101556

merged 14 commits into from
Sep 26, 2024

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@gpshead 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

@gpshead
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 bedevere-bot mentioned this pull request Feb 4, 2023
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@gpshead gpshead self-assigned this Sep 12, 2023
@gpshead gpshead marked this pull request as ready for review September 24, 2024 21:24
@gpshead gpshead requested a review from hugovk September 24, 2024 21:25
@gpshead 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 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
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gpshead commented Sep 25, 2024

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

ericsnowcurrently
ericsnowcurrently approved these changes Sep 26, 2024
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LGTM

Thanks for following this through!

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