[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[miss-islington]

miss-islington  added the comment:


New changeset 1c88bf8541e6fa292f1578144add17d3672c5fcf by Miss Islington (bot) 
in branch '3.9':
bpo-39244: multiprocessing return default start method first on macOS (GH-18625)
https://github.com/python/cpython/commit/1c88bf8541e6fa292f1578144add17d3672c5fcf


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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[miss-islington]

miss-islington  added the comment:


New changeset 285ff63351bb5a42099527c283f65434e761be83 by Miss Islington (bot) 
in branch '3.8':
bpo-39244: multiprocessing return default start method first on macOS (GH-18625)
https://github.com/python/cpython/commit/285ff63351bb5a42099527c283f65434e761be83


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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Tal Einat]

Tal Einat  added the comment:

Thanks for fixing this, Ido!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[miss-islington]

Change by miss-islington :


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nosy: +miss-islington
nosy_count: 5.0 -> 6.0
pull_requests: +19688
pull_request: https://github.com/python/cpython/pull/20431

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/20432

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Tal Einat]

Tal Einat  added the comment:


New changeset db098bc1f05bd0773943e59f83489f05f28dedf8 by idomic in branch 
'master':
bpo-39244: multiprocessing return default start method first on macOS (GH-18625)
https://github.com/python/cpython/commit/db098bc1f05bd0773943e59f83489f05f28dedf8


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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Tal Einat]

Change by Tal Einat :


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versions: +Python 3.10

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Ido Michael]

Ido Michael  added the comment:

Fixed Tal's comments, I took the darwin if check out of the 
reduction.HAVE_SEND_HANDLE, also fixed the test

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Ido Michael]

Ido Michael  added the comment:

Created a new clean PR GH-18625

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Ido Michael]

Change by Ido Michael :


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pull_requests: +17990
pull_request: https://github.com/python/cpython/pull/18625

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Ido Michael]

Ido Michael  added the comment:

Fixed the bug to default any macos into 'spawn'
PR: GH-18529

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Ido Michael]

Change by Ido Michael :


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keywords: +patch
pull_requests: +17905
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/18529

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Tal Einat]

Tal Einat  added the comment:

Good catch, Stefen!

This seems like we forgot to update multiprocessing.get_all_start_methods() 
when making the change to make "spawn" the default on macOS. I suggest updating 
it accordingly.

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nosy: +taleinat
stage:  -> needs patch

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Ned Deily]

Change by Ned Deily :


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components:  -macOS
nosy: +davin, pitrou -ned.deily, ronaldoussoren
versions: +Python 3.9

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[issue39244] multiprocessing.get_all_start_methods() wrong default on macOS

[Stefan Holek]

New submission from Stefan Holek :

In Python 3.8 the default start method has changed from fork to spawn on macOS.
https://docs.python.org/3/whatsnew/3.8.html#multiprocessing

get_all_start_methods() says: "Returns a list of the supported start methods, 
the first of which is the default."
https://docs.python.org/3/library/multiprocessing.html?highlight=finalize#multiprocessing.get_all_start_methods

However, it appears to still return fork as default:

  Python 3.8.1 (default, Dec 22 2019, 03:45:23) 
  [Clang 10.0.1 (clang-1001.0.46.4)] on darwin
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import multiprocessing
  >>> multiprocessing.get_all_start_methods()
  ['fork', 'spawn', 'forkserver']
  >>> 

Thank you!

--
components: Library (Lib), macOS
messages: 359503
nosy: ned.deily, ronaldoussoren, stefanholek
priority: normal
severity: normal
status: open
title: multiprocessing.get_all_start_methods() wrong default on macOS
type: behavior
versions: Python 3.8

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