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DM-55482: Disable implicit threading in multiprocessing workers#571

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timj wants to merge 1 commit into
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tickets/DM-55482
Open

DM-55482: Disable implicit threading in multiprocessing workers#571
timj wants to merge 1 commit into
mainfrom
tickets/DM-55482

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@timj

@timj timj commented Jul 15, 2026

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Worker processes are started with the spawn method, so runtime thread limits applied in the parent process do not carry over and inherited environment variables only cover libraries that have not yet created their thread pools. Call disable_implicit_threading again at the top of the subprocess entry point.

Checklist

  • ran Jenkins
  • ran and inspected package-docs build
  • added a release note for user-visible changes to doc/changes

Worker processes are started with the spawn method, so runtime thread
limits applied in the parent process do not carry over and inherited
environment variables only cover libraries that have not yet created
their thread pools. Call disable_implicit_threading again at the top
of the subprocess entry point.

Co-Authored-By: Claude Fable 5 <[email protected]>
@codecov

codecov Bot commented Jul 15, 2026

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.93%. Comparing base (1390dc3) to head (6d94935).
⚠️ Report is 5 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files
@@            Coverage Diff             @@
##             main     #571      +/-   ##
==========================================
+ Coverage   88.87%   88.93%   +0.06%     
==========================================
  Files         161      161              
  Lines       22448    22466      +18     
  Branches     2673     2673              
==========================================
+ Hits        19950    19981      +31     
+ Misses       1860     1842      -18     
- Partials      638      643       +5     

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