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[Python-Dev] this is what happens if you freeze all the modules required for startup

Brett Cannon bcannon at gmail.com
Tue Apr 15 00:21:19 CEST 2014 
On Mon, Apr 14, 2014 at 6:15 PM, Skip Montanaro <skip at pobox.com> wrote:

> On Mon, Apr 14, 2014 at 4:51 PM, Brett Cannon <bcannon at gmail.com> wrote:
> > Thoughts?
>
> Interesting idea, but YAGNI?
>

Not at all. Think of every script you execute that's written in Python. One
of the things the Mercurial folks say is hindering any motivation to switch
to Python 3 is the startup performance.


>
> In my work environment (Python 2.7.2, all the heavy lifting done in
> C++), startup costs are dominated by dynamic linking of all our C++
> libraries and their Boost wrappers:
>

Sure, but not everyone uses Boost or has long running processes where
startup time is minuscule compared to the total execution time.

-Brett


>
> % time python -c 'import tradelink.snake.v11_2 ; raise SystemExit'
>
> real 0m0.671s
> user 0m0.405s
> sys 0m0.044s
>
> % time python -c 'raise SystemExit'
>
> real 0m0.022s
> user 0m0.011s
> sys 0m0.009s
>
> Skip
>
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