gh-109817: Do not copy all test cases into the worker process - #155713
Merged
serhiy-storchaka merged 1 commit intoAug 13, 2026
Conversation
With --single-process-per-case, tests and case_groups contain all test cases of the whole run. Copying them for every test case was slow and could produce a too long command line. The worker needs neither.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
With
--single-process-per-case,testsandcase_groupscontain all test cases of the whole run.create_worker_runtests()copies them for every test case and serializes them as a single command line argument../python -m test --single-process-per-case test_asynciofailed withOSError: [Errno 7] Argument list too long. The copying is also slow and holds the GIL: with-j32, the number of test cases executed in 75 seconds increased from 1066 to 3214.The worker runs the tests it is given, so it needs neither.