Re: Slow templates in py2exe

On Thu, 17 Sep 2009, Aahz wrote:
> > My initial instinct is that py2exe is pulling in the Python version of
> > the NameMapper, which is indeed slower than the C version. The
> > NameMapper is what is responsible for mapping $myVar into the actual
> > entity that it represents.
> > 
> > Do you have the compiled version of NameMapper installed? Do you know if
> > py2exe is pulling it in?
> 
> Curioser and curioser, as Alice said.  AFAICT, there isn't any
> _namemapper.pyd anywhere on the system.  (There's a _namemapper.so on my
> Mac.)  There doesn't seem to be an official pyd for 2.6, should I use
> http://feisley.com/python/cheetah/pyd2.2.1/py26/_namemapper.pyd
> ?

Perhaps if you asked James nicely enough he could post a build of 2.0.1
on Windows, the downside of this of course is that prior to v2.2.2
Cheetah was less-than-friendly in terms of building on Windows (which is
why we actually had _namemapper.pyd files checked in.)


> What are the chances that it will work with Cheetah 2.0.1?  (I'm close
> to a production release and would really rather not change Cheetah
> versions right now.)  Alternatively, how difficult is it likely to be to
> upgrade?

The upgrade isn't too terribly difficult provided you're not already
handling unicode objects in some hackish fashion (we had this issue at
Slide, some "automagic code" encoding/decoding back and forth into utf-8
encoded str objects). 

Might be worth a try depending on your timeline.

> Any clue why Cheetah is so fast outside the .EXE without any
> _namemapper.pyd around?

The very nature of the NameMapper's function means it's going to call a
lot of functions and iterate quite a bit through a few lists, IIRC the
C version just cuts down a lot of overhead related to Python dynamic
lookup and dispatch. I'm probably wrong about that though :)


Cheers

-R. Tyler Ballance
Slide, Inc.

p.s. mind me asking what you're shipping with Cheetah on Windows? :D

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