Thank you for pointing me in the direction of shapeindex. I ran shapeindex and this is now my performance when rendering 1 tile at a time: (southeastern united states, lots of borders) zoom level: seconds / tile 2 12 3 10 4 10 5 5 6 2.6 7 0.8 8 0.5 9 0.5 10 0.5 11 0.3 (below this no boundaries are visible for this particular location) 12 0.1 (anything with no boundaries visible is really fast, but with boundaries visible its over 0.5 seconds)
Any tile that has a visible border, even at really high zoom levels (16+) will take .5 seconds to render. The end result is that when browsing my google map, the CPU is pegged at 100% for 10-15 seconds before any tiles show up. I can pre-create all the images at low zoom levels so i'm not concerned with the slow performance there. But anything beyond zoomd level 10 may require too much disk space to pre-create... My stylesheet is very simple right now. A single fill color and a single border color. In reality I will need to have a little more defined styling as well. On Thu, Jul 8, 2010 at 2:45 AM, Frederik Ramm <[email protected]> wrote: > Joel, > > joel collins wrote: >> >> What can be done to speed up the rendering? Should I be downsampling >> the number of data points in the shape files? We like the high level >> of accuracy that we see in the tiger files but maybe thats what is >> slowing this down? > > Have you created index files using the shapeindex tool? > > You might want to create two versions of your shapes, one downsampled one > full resolution, then configure Mapnik so that the downsampled ones are used > on the lower zoom levels and the high-resolution ones on the higher zoom > levels. (My assumption here is that your performance gets worse for lower > zooms.) > > Bye > Frederik > _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
