On Wed, Oct 10, 2012 at 09:12:20AM +0200, Strahinja Kustudić wrote: > Hi everyone, > > I have a Postgresql 9.1 dedicated server with 16 cores, 96GB RAM and RAID10 15K > SCSI drives which is runing Centos 6.2 x64. This server is mainly used for > inserting/updating large amounts of data via copy/insert/update commands, and > seldom for running select queries. > > Here are the relevant configuration parameters I changed: > > shared_buffers = 10GB > effective_cache_size = 90GB > work_mem = 32MB > maintenance_work_mem = 512MB > checkpoint_segments = 64 > checkpoint_completion_target = 0.8 > > My biggest concern are shared_buffers and effective_cache_size, should I > increase shared_buffers and decrease effective_cache_size? I read that values > above 10GB for shared_buffers give lower performance, than smaller amounts? > > free is currently reporting (during the loading of data): > > $ free -m > total used free shared buffers cached > Mem: 96730 96418 311 0 71 93120 > -/+ buffers/cache: 3227 93502 > Swap: 21000 51 20949 > > So it did a little swapping, but only minor, still I should probably decrease > shared_buffers so there is no swapping at all. You might want to read my blog entry about swap space: http://momjian.us/main/blogs/pgblog/2012.html#July_25_2012 It is probably swapping unused memory _out_ to make more use of RAM for cache. -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
