[issue26275] perf.py: calibrate benchmarks using time, not using a fixed number of iterations

[STINNER Victor]

STINNER Victor added the comment:

> If running time is close to the limit, different run will use different number of repetitions. This will add additional instability.

Maybe, to be honest I don't know. How can we decide if a patch makes
perf.py more and less stable?

> I prefer a stable number of repetitions manually calibrated for average modern computer.

The problem is to define an "average modern computer".

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