Jon Burgess ha scritto: > On Mon, 2009-01-05 at 20:46 +0000, Roberto Navoni wrote: > >> Hi, >> I have a question for OSM-Developer ;) >> So I'm trying mapnik for render italian OSM planet , but the performance >> on my sandbox is not so god . I'm using an old one hp laptop that use >> Ubuntu 8.04 as SO and as hardware use P4 3 Ghz 1 GByte of ram . I see >> that actualy are rendering only two tile for second. I'm usining >> postgress 8.3 as db. Are there some optimization for speed up the render >> time. >> How many mapnik i can start on a single cpu ? The performance is better ? >> > > Are you using generate_tiles.py for rendering your tiles? > Yes I use generate tiles > Is the web server under your control or are you serving static files via > a 3rd party web host? > > I'm doing some test on my server ... I have complete control on it , I'm using Ubuntu 8.04 as Operating systems .. > The main tile.openstreetmap.org server uses mod_tile[1] which uses > several optimisation tricks to improve the performance but you can only > get the full benefit of this if you can install a custom Apache module. > > Ok ... now I try It. > - multithreaded rendering (should exploit improve efficiency if you have > hyperthreading in your CPU). > - rendering and storing tiles in "meta-tiles" (8x8 at once). > - rendering on-demand, avoiding the need to pre-render lots of tiles > > If you can't install the Apache module then the mod_tile render daemon > can be used standalone with the speedtest & convert_meta tools to > generate a tree containing plain PNG files for uploading to a 3rd party > web host. I can provide more details if you are interested in this. > > Last time I benchmarked the tile.openstreetmap.org server it was > rendering approximately 600 tiles/s using 2 x dual core Opteron CPUs. >
> The osm.xml file has got significantly more complex since I did those > tests so the numbers are probably a bit slower now. Even so, your P4 > should manage more than 10 times your current performance. > > Strange .. is possible that there're some problem on db configuration ? With top I see the cpu usage by thread and i see that postgress using 15 % of cpu and mapnik use only 12% of cpu ... is possible that there're some setting to change on postgress or on mapnik ? > Jon > > 1: http://wiki.openstreetmap.org/index.php/Mod_tile > > > ------------------------------------------------------------------------ > > > Nessun virus nel messaggio in arrivo. > Controllato da AVG - http://www.avg.com > Versione: 8.0.176 / Database dei virus: 270.10.2/1876 - Data di rilascio: > 05/01/2009 9.44 > > _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
