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
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