Hi Sylvain, You can improve rendering speed significantly by rendering one big 'meta' tile and then chopping it up into actual tiles. In my experience 8x8 (64) or even 16*16 (256) meta tiles make all process much faster. Also, consider using mod_tile which is using the same approach and relatively easy to setup.
Best Artem On 8 Nov 2008, at 15:59, sylvain letuffe wrote: > Hi there, > > I'have set up a tiles server based on mapnik that I plan to use (for > now) for > France only. > ( Very good wiki page explaining that) > My setup is : debian etch 64/mapnik 0.5.1/postGIS/generate_tiles.py > with a quite common machine : dual core 2.5GHZ / 2Go RAM > > After much fighting I finaly made it work, and I am happy on all > aspects, but > speed. > > While the Mapnik at openstreetmap.org does the rendering (until > level 18 if I > see it well) in something like around ~24 hours, I am currently > doing it for > france (600Mo of osm data) until level 14 at a poor ~15 hours time > > Unless the server over there is a martian one clocked at 10^16 Hz, I > think I'm > doing something wrong, but what ? > > I was searching on the wiki/doc at mapnik but didn't find tips for > that > > The only thing I changed in generate_tiles.py is : > minZoom = 5 > maxZoom = 16 > bbox = (-4, 42.0,8,50.0) > render_tiles(bbox, mapfile, tile_dir, minZoom, maxZoom) > > Symptoms to help : > - The CPU is fed up at 100% ( load 1.00) > - The memory is almost unused (5Mo for postgres !! 60Mo for > generate_tiles.py) > - The disk is unused > - A tile takes ~0.5s to be generated > - Severall thousand of "Empty Tile" messages appears during the > process, while > still taking ~0.5s > Does this benchmark looks okay ? > > Thanks for help or URL > > > > -- > Sylvain Letuffe [EMAIL PROTECTED] > qui suis-je : http://slyserv.dyndns.org > > > > _______________________________________________ > dev mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/dev _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
