Re: [matplotlib-devel] Add some caching to texmanager.py?

[Fernando P. <Fer...@co...>]

John Hunter wrote:
>>>>>>"Fernando" == Fernando Perez <Fer...@co...> writes:
> 
> 
>     Fernando> This was in a long-running session with very large
>     Fernando> memory allocations, but it dawned on me that
>     Fernando> get_dvipng_version(self) should cache its return value.
>     Fernando> There's no point in forcing a popen() call every single
>     Fernando> time, is there?
> 
> It already does cache the version
> 
>     def get_dvipng_version(self):
>         if self.dvipngVersion is not None: return self.dvipngVersion
>         sin, sout = os.popen2('dvipng --version')
>         ...snip...
> 
> I think the reason it is failing in your case is that is each renderer
> creation creates a new TexManager instance.  The cache should be on a
> class basis and not on a per instance basis (slaps self on head).
> Moving
> 
>         self.dvipngVersion = None
> 
> to the class level and out of __init__ should suffice.  I made this
> change, and similar changes in texmanager and backend_agg, so that
> caching is shared between instances.  Update from CVS and let me know
> if everything still works :-)

swamped at the moment, but I'll let you know if I see problems when I 
get a chance.

>     Fernando> I also just saw pylab crash when a user was trying to
>     Fernando> run with $PWD being something he didn't have write
>     Fernando> access to.  Are there any checks in the code to fall
>     Fernando> back to /tmp or something sensible if texmanager can't
>     Fernando> write the temp files it needs?  Sorry for not giving a
>     Fernando> traceback, but I only saw this on someone else's screen
>     Fernando> while helping them, and for some odd reason it's not
>     Fernando> happening on my box.
> 
> This is probably failing on the tex/latex temporary files.  I spent
> some time initially trying to figure out how to get these to go into
> ~/.tex.cache but didn't succeed.  If anyone knows how to direct
> tex/latex to put the various *.aux, *.log, etc, files in a specified
> directory, pass it my way.

I don't really know, sorry.  My texpertise is pretty limited, as you know :)

Thanks for the fixes!

f