2010/1/29 Richard Neill <rn214@xxxxxxxxx>: > > > **Rod MacNeil wrote: >> >> Hi All, >> >> I have a server running CentOS5 with 6gb of memory that will run postgres >> 8.3 exclusively. >> I would like to allocate 4gb of the memory to shared buffers for postgres. > > It might be worth pausing at this point: > > The various postgresql tuning guides usually suggest that on a dedicated > system, you should give postgres about 1/4 of the RAM for shared buffers, > while telling it that the effective_cache_size = 1/2 RAM. > > Postgres will make good use of the OS cache as a file-cache - the > "effective_cache_size" setting is advisory to postgres that it can expect > about this much data to be in RAM. AFAIK effective_cache_size is estimation of OS Page Cache + Estimated Cache in shared_buffers. > > Also, If you are setting up a new system, it's probably worth going for > 8.4.2. Postgres is relatively easy to build from source. > > HTH, > > Richard > > -- > Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-performance > -- Cédric Villemain -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
