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Use spawn start method for multiprocessing inside the test to avoid deadlock/timeout#5213

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yuxuanzhuang wants to merge 5 commits intodevelopfrom
timeout_not_again
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Use spawn start method for multiprocessing inside the test to avoid deadlock/timeout#5213
yuxuanzhuang wants to merge 5 commits intodevelopfrom
timeout_not_again

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yuxuanzhuang commented Jan 21, 2026 *
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Fixes #5191

Changes made in this Pull Request:

  • use a spawn start method inside the test to avoid deadlock

LLM / AI generated code disclosure

LLMs or other AI-powered tools (beyond simple IDE use cases) were used in this contribution: no

PR Checklist

  • Issue raised/referenced?
  • Tests updated/added?
  • Documentation updated/added?
  • package/CHANGELOG file updated?
  • Is your name in package/AUTHORS? (If it is not, add it!)
  • LLM/AI disclosure was updated.

Developers Certificate of Origin

I certify that I can submit this code contribution as described in the Developer Certificate of Origin, under the MDAnalysis LICENSE.


Documentation preview : https://mdanalysis--5213.org.readthedocs.build/en/5213/

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codecov bot commented Jan 21, 2026 *
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Codecov Report

All modified and coverable lines are covered by tests.
Project coverage is 93.83%. Comparing base (900d20b) to head (cea6abb).

Additional details and impacted files
@@ Coverage Diff @@
## develop #5213 +/- ##
========================================
Coverage 93.83% 93.83%
========================================
Files 180 180
Lines 22473 22473
Branches 3189 3189
========================================
Hits 21088 21088
Misses 923 923
Partials 462 462

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yuxuanzhuang force-pushed the timeout_not_again branch from 77452dc to 81b8ef5 Compare January 21, 2026 23:37
yuxuanzhuang force-pushed the timeout_not_again branch from 81b8ef5 to 7e9a99c Compare January 22, 2026 00:53
yuxuanzhuang added 2 commits January 21, 2026 18:35
yuxuanzhuang requested a review from IAlibay January 22, 2026 04:26
yuxuanzhuang changed the title [WIP] Time out fix (trying) Use spawn start method for multiprocessing inside the test to avoid deadlock/timeout Jan 22, 2026
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yuxuanzhuang commented Jan 22, 2026

Tested twice and passed.

orbeckst requested changes Feb 6, 2026
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I'd be happy to merge and see if it improves things.

Could you add a comment to the test (along #5191 (comment) ) explaining the changes and referencing issue/PR, just so that future us knows where to look. I might even leave the original code commented out in one case, just to see clearly what the workaround does, given that the current code is probably what most people would use.

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orbeckst self-assigned this Feb 8, 2026
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CI: Azure_Tests Win timeout occasionally

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