Roberto Navoni ha scritto: Hi Jon, We found the problem ;) Good I put the comment on convert and the render go fast ;) Thanks for your support :) Do you know I can update the old one version of mapnik with the new one ? Best Regards Roberto > Jon Burgess ha scritto: > >> On Tue, 2009-01-06 at 00:58 +0000, Roberto Navoni wrote: >> >> >>> 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 ? >>> >>> >> Possibly but postgres is not normally the bottleneck. >> >> >> >>> >>> 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 ? >>> >>> >> Some CPU is taken by the "convert" step. Since this is a short lived >> process it does generally appear in top. >> >> If you want to test, simply comment out the following lines in >> generate_tiles.py and see how much faster it goes: >> >> command = "convert -colors 255 %s %s" % (tile_uri,tile_uri) >> call(command, shell=True) >> >> For serving tiles you really want to use 256 colours since the tiles are >> much smaller. If you are using a recent build of Mapnik then this >> includes a faster colour conversion algorithm, just change the format >> from png to png256 a line earlier: >> >> view.save(tile_uri,'png256') >> >> Jon >> >> >> > Thank for your reply I see that convert use cpu with top for some times > ... now I try do you know how i can update Mapnik 4.0 to the new one ? > Best Regards > Roberto > >> ------------------------------------------------------------------------ >> >> >> 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 > ------------------------------------------------------------------------ > > > 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 > >
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