Hi all,
I'm having a little big problem related to memory being cached when
rendering tiles with mapnik.
I've followed the FOSS4G tutorial [1] to deploy a Mapnik in a local
server, I've imported the whole OSM planet into PostGIS.
I'm using a virtual machine with these specs:
Ubuntu Maverick (10.10 x64)
Postgres 8.4
postgis 1.5
Tomcat 6
6GB RAM
1 Intel Xeon 4Cores 2.4GHz
This is the console log when I make several tile requests:
root@Onda:/home/desa/tilelite# free -m
total used free shared buffers cached
Mem: 5983 605 5378 0 25290
-/+ buffers/cache: 288 5695
Swap: 5883 0 5883
root@Onda:/home/desa/tilelite# [TileLite Debug] --> Zoom,X,Y: 2,3,1
[TileLite Debug] --> scale_denom: 139770566.007
130.0.2.160 - - [24/Mar/2011 09:38:43] "GET /2/3/1.png HTTP/1.1" 200 -
[TileLite Debug] --> Zoom,X,Y: 2,2,1
[TileLite Debug] --> scale_denom: 139770566.007
130.0.2.160 - - [24/Mar/2011 09:38:51] "GET /2/2/1.png HTTP/1.1" 200 -
[TileLite Debug] --> Zoom,X,Y: 2,1,1
[TileLite Debug] --> scale_denom: 139770566.007
130.0.2.160 - - [24/Mar/2011 09:38:54] "GET /2/1/1.png HTTP/1.1" 200 -
[TileLite Debug] --> Zoom,X,Y: 2,0,1
[TileLite Debug] --> scale_denom: 139770566.007
130.0.2.160 - - [24/Mar/2011 09:38:57] "GET /2/0/1.png HTTP/1.1" 200 -
[TileLite Debug] --> Zoom,X,Y: 2,3,2
[TileLite Debug] --> scale_denom: 139770566.007
130.0.2.160 - - [24/Mar/2011 09:38:58] "GET /2/3/2.png HTTP/1.1" 200 -
root@Onda:/home/desa/tilelite# free -m
total used free shared buffers cached
Mem: 5983 2191 3792 0 261871
-/+ buffers/cache: 293 5689
Swap: 5883 0 5883
As I make tile requests the cached memory grows and it's never freed,
until no more memory lefts in the SO.
I've tried several configurations of the postgresql.conf, for example
the one at [2]. I've also tried increasing the max shared memory of the
kernel by editing the /etc/sysctl.conf and setting kernel.shmmax =
268435456.
Does anybody has faced this problem before?
Any help would be appreciated.
Best regards,
[1] http://dbsgeo.com/foss4g2010/html/index.html
[2]
http://www.geofabrik.de/media/2010-07-10-rendering-toolchain-performance.pdf
--
Alberto Romeu
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