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 increfs cm->cm_callable and 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()

Linked PRs

gh-145779: Improve classmethod/staticmethod scaling in free-threaded build #145826
[3.14] gh-145779: Improve classmethod/staticmethod scaling in free-threaded build (gh-145826) #146088