On Sun, 2009-10-18 at 21:59 +0530, Viji V Nair wrote: > On Sun, Oct 18, 2009 at 8:37 PM, Jon Burgess <jburgess777@xxxxxxxxxxxxxx> wrote: > > On Sun, 2009-10-18 at 18:44 +0530, Viji V Nair wrote: > >> > > >> >> can see lots of system resources are free, memory, processors etc > >> >> (these are 4G, 2 x 5420 XEON) > > > > 4GB may be a little small. Have you checked whether the IO reading your > > data sources is the bottleneck? > > I will be upgrading the RAM, but I didn't see any swap usage while > running this applications... > the data source is on a different machine, postgres+postgis. I have > checked the IO, looks fine. It is a 50G DB running on 16GB dual xeon > box Going into swap is not the issue. If you have extra RAM available then the OS will use this as a disk cache which means the DB will be able to access indexes etc without needing to wait for the disk every time. 16GB of RAM for a 50GB DB should be sufficient if the data is sensibly indexed. > I have to give a try on mod_tile. Do you have any suggestion on using > nginx/varnish as a cahce layer? There have been some tests using squid as a cache in front of mod_tile. This worked reasonably well but did not give a big performance increase because the server was already able to handle the load without an additional cache. If you want to discuss this further then I'd suggest continuing the conversation on the OSM or Mapnik lists. Jon _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
