[issue3329] API for setting the memory allocator used by Python

[STINNER Victor]

STINNER Victor added the comment:

Benchmark of py_setallocators-3.patch:

 - benchmarks suite (-b 2n3): some tests are 1.04x faster, some tests are 1.04 slower, significant is between 115 and -191. I don't understand these output, but I guess that the overhead cannot be seen with such test.
 - pybench: "+0.1%" (diff between -4.9% and +5.6%)

If I understood correctly, the overhead is really really low (near zero).

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