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[Python-Dev] Embedded Python startup is slow

bruce bushby bruce.bushby at gmail.com
Thu Mar 24 17:52:26 CET 2011 
".....your Desktop PC being that MS-Windows..."  aaaaww sis man, it's all
Linux :))))

I wanted to make sure I've not missed some compile trick for this sort of
thing.

".....So maybe you should try to come up with a patch, to find out if the
cache helps?"
Yes, now that I know I've not ignored some obvious "everybody knows not to
do that" trick I'll look into some form of cache.....although off the top of
my head I imagine it''ll be difficult to precede every open with a cache
lookup....perhaps this is something better suited for the underlying
"uClibc" framework....but then who refreshes the cache.

Thanks for the thoughts and idea, if I find a nice solution I'll be sure to
post an update.


Bruce






On Thu, Mar 24, 2011 at 4:18 PM, James Y Knight <foom at fuhm.net> wrote:

> On Mar 24, 2011, at 11:58 AM, bruce bushby wrote:
> > My main concern was that a freshly compiled Python attempts to open 168
> non-existent files before starting.
> >
> > I understand that an interpreted language is probably not the best choice
> for an embedded device (although it's very nice for prototyping) , Python
> really should know what exists after it's just been compiled....ie before
> any corrupting modules or other nonsense has been added.
> >
> > It appears it is hard coded to open these files regardless of any
> "configure" options.
> >
> > On my desktop pc, when I run the most simple "Hello World" .... 78% of
> the overall execution time is spent opening files....most of which don't
> exist.
> >
> > Some form of "cache" would help the startup time on the "second go" .....
> but arguably just a "band aid" covering a deeper problem.
>
> The deeper problem on your Desktop PC being that MS-Windows' file system
> calls are horrifically expensive for no good reason? :)
>
> James
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