[Python-Dev] Object free lists

[Bob Ippolito]

On Jun 15, 2004, at 10:52 PM, Tim Peters wrote:

> [Eric Huss]
>> The only problem I see with using pymalloc is that the objects won't 
>> be
>> stored in memory in such a compact way.
>
> The difference can be large, because pymalloc aligns to 8-byte 
> boundaries.
> So, e.g., on most boxes today a Python int object consumes 12 bytes, 
> but
> would consume 16 if allocated with pymalloc.  That's a 33% boost, and 
> that
> can be significant for apps hanging on to lots of ints.
>
> OTOH, on most boxes there would be no real size difference for float
> objects.

The implementation of malloc in OS X always returns pointers aligned to 
16-byte boundaries, so that the buffers can be reasonably used by 
AltiVec instructions.  Would there be a difference in this case? :)

-bob
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