[Python-Dev] Re: Who cares about the performance of these opcodes? (original) (raw)

Michael Hudson mwh at python.net
Wed Mar 10 06:10:50 EST 2004

"A.M. Kuchling" <amk at amk.ca> writes:

On Tue, 09 Mar 2004 08:59:52 -0500, Phillip J. Eby <pje at telecommunity.com> wrote:

I personally don't think it'll help much, if the goal is to reduce cache misses. After all, the code is all still there. But, it should not do For a planned PyCon lightning talk, I'm benchmarking various combinations of optimizer options. One interesting result: CVS Python gets 25997 pystones on my machine when compiled with -O3 (the default), but 26707 when compiled with gcc's -Os flag. -Os optimizes for size, running the subset of the -O2 optimizations that don't increase code size.

What architecture? I played around on my ibook with various compilation options and running with -fprofile-arcs and so on and basically came to the conclusion that nothing made very much difference (once past -O2). Can't remember if I tried -Os.

Cheers, mwh

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