[Python-Dev] Slowdown in Python CVS

[M.-A. Lemburg]

Guido van Rossum wrote:
>>My nightly run of pybench went up from the usual 7590ms per
>>run to around 8200ms between Monday night and today. Can anyone
>>explain this ?
> 
> Did you compare the outputs?  There could be importants hint there!
> :-)

Unfortunately, the cronjob always uses the same file to store
the benchmark data (I've changed that now, to be able to check
on a day-per-day basis).

Is there a way to check out a Python CVS version dated 2003-02-24 ?
I could then give that a try again.

> Maybe this checkin to ceval.c backfired?
> 
> ----------------------------
> revision 2.351
> date: 2003/02/26 18:11:50;  author: rhettinger;  state: Exp;  lines: +18 -4
> Micro-optimizations.
> * List/Tuple checkexact is faster for the common case.
> * Testing for Py_True and Py_False can be inlined for faster looping.
> ----------------------------

Could be. I don't think inlining in ceval will help. The switch is
too long already and it's much better to let the compiler/processor
decide which parts should really get inlined since they have
more knowledge about the platform than we do (sometimes :-).

-- 
Marc-Andre Lemburg
eGenix.com

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