[issue45116] Performance regression 3.10b1 and later on Windows: Py_DECREF() not inlined in PGO build

STINNER Victor report at bugs.python.org
Fri Sep 17 16:56:56 EDT 2021


STINNER Victor <vstinner at python.org> added the comment:

> If https://bugs.python.org/file50280/310rc2_benchmarks.txt is correct, this means that we have a 7% slowdown in Windows PGO builds for 3.10, which I don't think is acceptable.

What I understood is that the https://bugs.python.org/msg401743 patch makes 1.07x faster.

But https://bugs.python.org/issue45116#msg401143 compares Python 3.10b1 to Python 3.10a7: Python 3.10b1 is slower (32-bit: "1.07", 64-bit: "1.14": "higher the slower" wrote neonene).

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