STINNER Victor <vstin...@python.org> added the comment:

> When I tested with run -m test --pgo -j8, it doesn't affect to optimized 
> result with fast build time.

You only test libregrtest.main and libregrtest.runtest_mp modules which don't 
execute code. Does it mean that running tests is useless to train the PGO?

Or does PGO magically aggregates results when multiple processes are run?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46551>
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