"We suspected that maybe this is related to server spec or postgresql. Firstly, We change the spec of the server to test, and the result is the same: the different lat/lng, and the different speed. But when high CPU is used, all of rendering speed become faster. "
What does this mean? When you run it on a different server it renders faster? 2011/2/23 Kaku Shou <[email protected]>: > Hi, > > My name is Kaku from Rainbow. Currently, I am trying to render osm data of > Japan, and encounter a problem that the speed is very slow when rendering > some lat/lng. > > For exmaple, if we set bbox = (135.5,34, 136,34.5), and zoom level = 16, the > rendering speed of folder between 54435 (lng = 135.5) and 57498(lng = > 135.85) is very fast, and it takes 4 minutes to render; but the rendering > speed of folder between 57499 (lng = 135.855) and 57526 (lng = 136) is very > slow, and it takes 3 hour to render. > > We suspected that maybe this is related to server spec or postgresql. > Firstly, We change the spec of the server to test, and the result is the > same: the different lat/lng, and the different speed. But when high CPU is > used, all of rendering speed become faster. Secondly, we check the log of > postgresql, the query is executed as fast as it could be. So it doesn't look > like this is related to either server spec or postgresql. > > Could anyone give me any advice to resolve this problem to accelerate the > rendering speed. Below are our server spec: > > Server spec: > CPU : 64bit, 4 Cores > Memory : 2G > OS : Ubuntu 10.04 > > Installed packages > python-cairo libmapnik0.7 mapnik-utils python-mapnik > Postgres 8.4 > PostGIS 1.4 > Mapnik > src : http://svn.mapnik.org/tags/release-0.7.1/ > Rendering OpenStreetMap with Mapnik > src : http://svn.openstreetmap.org/applications/rendering/mapnik/ > rendering srcript : generate_tiles_multiprocess.py > > > _______________________________________________ > Mapnik-users mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/mapnik-users > > _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
