[Python-Dev] 2.5a1 Performance (original) (raw)

Benji York benji at benjiyork.com
Thu Apr 6 00:04:00 CEST 2006

Jeff Epler wrote:

I'm not trivially able to try a 32-bit build, but for my system it appears that 2.5 is moderately faster than 2.4 when built with all the defaults.

OK, this prompted me to question my sanity.

Being on a laptop the default is to do frequency scaling (different speeds depending on CPU load). When running pystone I've always seen an initial run that was much slower than subsequent runs, so I'd run several and throw out the first few. This gives a max of 35k pystones with 2.4.2 and 30k with 2.5a1.

I decided to force the CPU freq. to the maximum (1.4 GHz) and remeasure. 2.5a1 reported the same pystones (30k) and, to my surprise, 2.4 reported 31k (about 5k less than with freq. scaling on). So there seems to be some interaction between frequency scaling and pystones.

Benchmarking is hard, let's go shopping!

Benji York

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