benchmark: #136681 (comment)

Won't this break when called concurrently?

Hmm, @ZeroIntensity, test seems fixed with using combined static and _Thread_local. May this work or this is too naive approach?

Hm, you could try it and see what the test suite says. To my knowledge, thread local lookups are generally slower, so we might not see a speedup.

Well, CI tests pass, but that might be just an accident.

thread local lookups are generally slower, so we might not see a speedup.

Here my quick measurements for default configure arguments on Linux box. (Free-threading build might change the picture.) Micro-benchmarks are for math.fmin(): when only positional arguments are allowed (as in the main) vs positional-or-keyword allowed.

In the main:

With the patch:

Benchmark hidden because not significant (1): fmin(1.0, 2.0) x 2 times

import pyperf
from math import fmin

def f(n):
    for _ in range(n):
        fmin(1.0, 2.0)

runner = pyperf.Runner()
runner.bench_func('fmin(1.0, 2.0)', fmin, 1.0, 2.0)
for n in [2, 10, 100]:
    s = f'fmin(1.0, 2.0) x {n:3} times'
    runner.bench_func(s, f, n)