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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