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gh-109817: Do not copy all test cases into the worker process #155713

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Merged
serhiy-storchaka merged 1 commit into from
Aug 13, 2026
+4 −1
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gh-109817: Do not copy all test cases into the worker process #155713

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5 changes: 4 additions & 1 deletion Lib/test/libregrtest/runtests.py
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Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,10 @@ def copy(self, **override) -> 'RunTests':
return RunTests(**state)

def create_worker_runtests(self, **override) -> WorkerRunTests:
state = dataclasses.asdict(self)
# Drop the large fields *before* converting: asdict() copies them
# deeply, which is expensive when the whole run has many cases.
state = dataclasses.asdict(
dataclasses.replace(self, tests=(), case_groups=None))
state.update(override)
return WorkerRunTests(**state)

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