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Free threaded scaling issues with @classmethod and @staticmethod #145779
Description
Bug report
We have reference count contention from:
-
The classmethod object, which is stored in the MRO cache. This should be pretty easy to fix (enable deferred reference counting when creating the object).
-
sm_descr_get increfs
sm->sm_callable -
cm_descr_get creates a new
PyMethod_New, which increfscm->cm_callableand the containing class
ftscalingbench.py
class MyClassMethod:
@classmethod
def my_classmethod(cls):
return cls
@staticmethod
def my_staticmethod():
pass
@register_benchmark
def classmethod_call():
obj = MyClassMethod()
for _ in range(1000 * WORK_SCALE):
obj.my_classmethod()
@register_benchmark
def staticmethod_call():
obj = MyClassMethod()
for _ in range(1000 * WORK_SCALE):
obj.my_staticmethod()
Activity
brijkapadia commentedon Mar 11, 2026
Don't
staticmethodobjects already use deferred reference counting?colesbury commentedon Mar 11, 2026
Yes
colesbury commentedon Mar 11, 2026
I've edited the issue description
pythongh-145779: Improve classmethod/staticmethod scaling in free-thr…
pythongh-145779: Improve classmethod/staticmethod scaling in free-thr…
pythongh-145779: Improve classmethod/staticmethod scaling in free-thr…
pythongh-145779: Improve classmethod/staticmethod scaling in free-thr…
Merge branch 'main' into pythongh-145779-classmethod-staticmethod-sca…
gh-145779: Improve classmethod/staticmethod scaling in free-threaded …
pythongh-145779: Improve classmethod/staticmethod scaling in free-thr…
[3.14] pythongh-145779: Improve classmethod/staticmethod scaling in f…
pythongh-145779: Improve classmethod/staticmethod scaling in free-thr…
[3.14] gh-145779: Improve classmethod/staticmethod scaling in free-th…
khalidsaidi commentedon Mar 25, 2026
pythongh-145779: Improve classmethod/staticmethod scaling in free-thr…