[OSM-talk] Quicker Tile Rendering

Grant Slater openstreetmap at firefishy.com
Sun May 8 15:47:16 BST 2011


Hi OSM,

The OSM tile server has been upgraded over the last few days. Changes
should now appear much quicker on the map.

Many thanks to Jon Burgess, the Mapnik.org guys and the others for
making this happen.

Technical:
The rendering database was switched to an Intel 320 Series 600GB SSD
disk, from 4x 300GB 10K rpm in RAID10. PG8.3 -> PostgreSQL 9 with GIN
Index FASTUPDATE disabled. Rendering has also switched to Mapnik2 svn
r2875.
The full DB reload into PG9 used approximately 1TB of the SSD write
capacity of a rating of 60TB. Now that only diffs are being applied
the write usage has dropped drastically. We'll watch the write usage.
Some metatiles are being moved across to the 'old' RAID10 array to
improve overall tile IOPs. Tile server munin graph is here:
http://munin.openstreetmap.org/openstreetmap/yevaud.openstreetmap/index.html

Recent reports of rendering problems should all be resolved now:
 http://lists.openstreetmap.org/pipermail/talk/2011-April/057651.html
 http://lists.openstreetmap.org/pipermail/dev/2011-April/022402.html
 http://lists.openstreetmap.org/pipermail/dev/2011-May/022495.html

Regards
 Grant
 Part of OSM sysadmin team.



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