Hi, For different reasons, I need re-building a whole lot of rather old (~8month) mapnik tiles across europe I had.
I am in the process of building it from zoom 0 to zoom 12 (other levels are handeled with on demand cache system ) >From level 0 to 5 things are going quite fast (presumably because there is almost nothing on it) but zooms ~6 to 8 are generated terribly slowly. 9 to 12 being still quite slow and 13 or less starts to be manageable. I'm using the generate_tiles.py program and a one year old mapnik file to trouble shoot the problem (the same I used 8 month ago) and I can't remember this process to be that slow ! The machine seams io-bound, top : Cpu(s): 4.8%us, 1.8%sy, 0.0%ni, 69.4%id, 24.0%wa, 0.0%hi, 0.0%si, 0.0%st load 1.00, iostats tels me the reading speed on disks is around 2MB/s (~100 times less than my burst disk/raid0 speed) swap isn't used I've tweaked postgres with the wiki recommanded settings and a command like this : $ time ./nik2img.py -m osm_copy.xml -i jpeg -o test.jpeg -s 500,500 -e 2,40,8,46 (...) real 5m24.251s user 0m5.684s sys 0m0.572s poorly generates a small image in 5 minutes ! (dual core 2.6GHZ /2GO memory ) Is my memory faulty on what it used to be ? is this "expected" ? (or has data increase by a factor 10 ?) -- sly Sylvain Letuffe [email protected] qui suis-je : http://slyserv.dyndns.org _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
