[OSM-dev] mod_tile performance enhancements?

Simon Poole simon at poole.ch
Wed Jan 11 11:23:25 GMT 2012

What disk configuration do you have?


PS CLEANMAP (unannonced global version) runs essentially on a very 
similar system, less memory, and doesn't need 10s for a high zoom tile

Am 11.01.2012 11:39, schrieb Jason Lee:
> Hi,
> I have mod_tile running on a dedicated Linux server (Ubuntu 11.04, 
> 24GB RAM, 8 virtual QuadCore i7 processors) and generating some custom 
> maps. I am using ab (Apache Bench) to benchmark its performance when 
> rendering new tiles (at zooms 17-18, 1 concurrent x 1 run, clearing 
> cache each time) and getting time around 10,000 ms (10 secs) per tile. 
> Thereafter it is very quick (100ms) because it is cached.
> Ten seconds does sound quite slow and I was wondering what can be done 
> to improve it. Just out of curiosity, I tried disabling all the 7 
> Layers except for 1 Layer in the Mapnik stylesheet, so the rendering 
> requires a lot less db querying and map rendering - but I'm still 
> getting 10 seconds performance. This would suggest that the 
> performance bottleneck is not related to the mapnik backend.
> I've also played around with increasing the NUM_THREADS=3 to 32 in the 
> renderd.conf, but still no significant performance improvement when 
> rendering a fresh tile. Any ideas or pointers would be welcome. Thanks
> Jason
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