[OSM-dev] mod_tile performance enhancements?
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:
> 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
> dev mailing list
> dev at openstreetmap.org
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