[Tilecache] mapnik+tilecache caching problem

[Dane Springmeyer]

Freeman,

My hunch would be a threading problem (http://en.wikipedia.org/wiki/Race_condition 
).

I see that your are trying to deploy TileCache within MS4W on windows  
and I read here:

http://code.google.com/p/modwsgi/wiki/ProcessesAndThreading

That the 'The Windows 'winnt' MPM' is multi-threaded by default, which  
may be what is causing the problem.

Normally, on linux you would address this by using apache 'pre-fork'  
or deploying TileCache using mod_wsgi, daemon mode, and using  
thread=1. One windows I'm not sure about the best route.

Have you tried simply pre-generating a whole cache using (the single- 
threaded) 'tilecache_seed.py' script?

Dane



On Oct 5, 2009, at 11:29 PM, FreemanUz wrote:

>
> Hello,
> We developed special XML file for Mapnik. Its working great when
> we render it without Tilecache. But we have to use our map for GPS
> tracking project and we have to make a cache using Tilecache. While
> caching with Tilecache, some parts of some layers are missing or some
> parts of lines are drawing incorrectly.  You can see it in attached
> screenshots. Please tell us what is the problem here and how we can
> fix it?
>
> Thanks,
> Freeman
> -- 
> View this message in context: http://n2.nabble.com/mapnik-tilecache-caching-problem-tp3773400p3773400.html
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