Hm, I just notices that shared_buffers + effective_cache_size = 100 > 96GB, which can't be right. effective_cache_size should probably be 80GB.
Strahinja Kustudić | System Engineer | Nordeus
On Wed, Oct 10, 2012 at 9:12 AM, Strahinja Kustudić
<strahinjak@nordeus.com> 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.
Thanks in advance,
Strahinja
