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gh-148906: fix scaling of descriptors on free-threading#148915

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kumaraditya303 wants to merge 2 commits intopython:mainfrom
kumaraditya303:descriptor-scaling
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gh-148906: fix scaling of descriptors on free-threading#148915
kumaraditya303 wants to merge 2 commits intopython:mainfrom
kumaraditya303:descriptor-scaling

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@kumaraditya303 kumaraditya303 commented Apr 23, 2026 •
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On this PR:

❯ ./python.exe Tools/ftscalingbench/ftscalingbench.py --threads=10 descriptor
Running benchmarks with 10 threads
descriptor                 4.1x faster

@bedevere-app bedevere-app Bot mentioned this pull request Apr 23, 2026
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@kumaraditya303 kumaraditya303 added performance Performance or resource usage topic-free-threading labels Apr 23, 2026
colesbury
colesbury reviewed Apr 23, 2026
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Comment thread Objects/typeobject.c

PyObject *res_obj = PyStackRef_AsPyObjectBorrow(*out);
#if Py_GIL_DISABLED
// Optimistically enable deferred refcounting on descriptors
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@colesbury colesbury Apr 23, 2026

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Can we do this in type_setattro? That seems like a more logical place to me, and it's where we enable deferred reference counting on function objects.

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@markshannon markshannon Awaiting requested review from markshannon markshannon is a code owner

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