[Python-Dev] Python startup time

[Brett Cannon]

On Thu, Oct 10, 2013 at 9:38 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

> Le Thu, 10 Oct 2013 14:36:26 +0200,
> Dirkjan Ochtman <dirkjan at ochtman.nl> a écrit :
>
> > On Thu, Oct 10, 2013 at 2:25 PM, Christian Heimes
> > <christian at python.org> wrote:
> > > Benchmark of 1000 times "python -c ''"
> > >
> > > Python 3.4dev with all my experimental patches:
> > >
> > >   Avg: 0.705161 -> 0.443613: 1.59x faster
> > >
> > > 2.7 -> 3.4dev:
> > >
> > >   Avg: 0.316177 -> 0.669330: 2.12x slower
> > >
> > > 2.7 -> 3.4dev with all my patches:
> > >
> > >   Avg: 0.314879 -> 0.449556: 1.43x slower
> > >
> > > http://pastebin.com/NFrpa7Jh
> > >
> > > Ain't bad! The benchmarks were conducted on a fast 8 core machine
> > > with SSD.
> >
> > This seems promising. What OS are you using? On an older Linux server
> > with old-style HD's, the difference between 2.7 and 3.2 is much larger
> > for me:
>
> 3.2 isn't the same as 3.4.
>

And I think that is a key point as imports sped up a good deal in Python
3.3 thanks to the stat caching. So if you want to compare 3.4 to 3.3 that
makes sense. And if you want to compare 2.7 to 3.4 as a selling point as
startup is the worst benchmark performer in that comparison then fine. But
otherwise leave 3.0 - 3.2 out of the discussion as they are red herrings.

And as to the suggestion of speeding up import itself: good luck with that
without changing semantics. =)
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