What disk configuration do you have?
Simon
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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