[Python-Dev] Joys of Optimization

[Delaney, Timothy C (Timothy)]

> From: Raymond Hettinger [mailto:python at rcn.com]
> 
> If you're up for a couple of more runs, I would appreciate 
> independent 
> timing and testing of my dictionary freelist patch,
> www.python.org/sf/916251 , which may or may not be an improvement.

I'll see what I can do ... I'm still fairly shakey on FreeBSD - this is the first time I've *really* set it up. Spent 2.5 days building KDE 3.2 from ports because I couldn't work out how to make portupgrade install a new port from packages (yes - I now know it's portupgrade -N or portinstall ;)

> Also, here are additional fun scorecards that will probably also all
> show wins (too bad you can't measure memory consumption or code volume
> which also improved):
> 
>     python timeit.py -r9 "[1].pop()"
>     python timeit.py -r9 -s "a=[];b=a.append;c=a.pop" "b(1);c()"
>     python timeit.py -r9 "[None]*500"
>     python timeit.py -r9 -s "dc={}.__contains__" "dc(1)"
>     python timeit.py -r9 -s "a=b=[None]*500" "a+b"
>     python timeit.py -r9 -s "a=[None]*500" "a[:]"
>     python timeit.py -r9 -s "a=(None,)*50" "list(a)"
>     python timeit.py -r9 -s "import itertools"
>                             "list(itertools.repeat(None,500))"
>     python timeit.py -r9 -s "import itertools"
>                             "list(itertools.chain(xrange(500)))"
>     python timeit.py -r9 "xrange(500)"
>     python timeit.py -r9 -s "a=[1]; ag=a.__getitem__", "ag[0]"

Fun! Of course, I'll only be comparing between 2.3 and 2.4 (+ psyco) for any additional stuff. 2.3 was such a huge win over earlier versions.

Tim Delaney