STINNER Victor added the comment:

2014-04-16 3:18 GMT-04:00 Charles-François Natali <rep...@bugs.python.org>:
>> It calls calloc(size) instead of malloc(size), calloc() which can be faster 
>> than malloc()+memset(), see:
>> https://mail.python.org/pipermail/python-dev/2014-April/133985.html
>
> It will only make a difference if the allocated region is large enough
> to be allocated by mmap (so not for 90% of objects).

Even if there are only 10% of cases where it may be faster, I think
that it's interesting to use calloc() to allocate Python objects. You
may create large Python objects ;-)

I didn't check which objects use (indirectly) _PyObject_GC_Calloc().

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<http://bugs.python.org/issue21233>
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