[OpenLayers-Dev] Re: Mod_tile performance enhancements?

Jason Lee jaslee.st at gmail.com
Wed Jan 11 06:15:59 EST 2012

Actually, I tried isolating the other Layers and benchmarking again. It
turns out the 1st Layer (Areas) I tried is the most complex which is why
the response time was roughly the same. I tried a Boundary layer and render
time was about 2 seconds.


On Wed, Jan 11, 2012 at 10:44 AM, Jason Lee <jaslee.st at gmail.com> wrote:

> 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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