On Thu, Feb 7, 2013 at 11:16 PM, Tony Chan <tonychan@xxxxxxxxxxxxxx> wrote:
Hi,May I know what is your setting for OS cache?
Tony:
Wasn't sure if you were asking me, but here's the output from "free":
# free
total used free shared buffers cached
Mem: 198333224 187151280 11181944 0 155512 179589612
-/+ buffers/cache: 7406156 190927068
Swap: 16777208 0 16777208
- better to analyze large joins and sequential scan, and turn this parameter, e.g. reduce the size of effective_cache_size in postgresql.conf and change it for big queries.
This makes sense. We were setting it based on the tuning guideline from this page:
"Setting effective_cache_size to 1/2 of total memory would be a normal conservative setting, and 3/4 of memory is a more aggressive but still reasonable amount."
johnny
