[issue27535] Ignored ResourceWarning warnings leak memory in warnings registries

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> These results look strange to me. I expected the same difference but smaller the base time.

Honestly, I was also surprised.

I checked the whole benchmark twice. I also rebased the PR locally to make sure that it's not a side effect of a recent change in master.

Results are reliable and reproductible.

FYI I ran the C benchmark on my laptop "apu" using CPU isolation.

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I reproduced the benchmark on my other "selma" laptop, without CPU isolation (so less reliable).

C benchmark:

haypo at selma$ python3 -m perf compare_to master.json ignore.json 
Mean +- std dev: [master] 932 ns +- 66 ns -> [ignore] 1.01 us +- 0.05 us: 1.09x slower (+9%)

==> +78 ns

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