[Python-Dev] CPython optimization: storing reference counters outside of objects (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Tue May 24 14:32:42 CEST 2011

On Tue, 24 May 2011 14:05:26 +0200 Stefan Behnel <stefan_ml at behnel.de> wrote:

I doubt that efficient CPU cache usage was a major design goal of PyPy right from the start. IMHO, the project has changed its objectives way too many times to claim something like that, especially at the low level where the CPU cache becomes relevant. I remember that not so long ago, PyPy was hugely memory hungry compared to CPython. Although, one could certainly call that "designed for CPU cache usage"... ;)

Well, to be honest, "hugely memory hungry" doesn't necessarily mean cache-averse. It depends on the locality of memory access patterns.

Regards

Antoine.

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