<span style>Hi,</span><div style>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.</div>
<div style><br></div><div style>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.</div>
<div style><br></div><div style>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</div>
<div style><br></div><div style>Jason</div>