On Wed, May 7, 2014 at 11:38 AM, Andres Freund <and...@2ndquadrant.com> wrote: >> *) raising shared buffers does not 'give more memory to postgres for >> caching' -- it can only reduce it via double paging > > That's absolutely not a necessary consequence. If pages are in s_b for a > while the OS will be perfectly happy to throw them away.
The biggest problem with double buffering is not that it wastes memory. Rather, it's that it wastes memory bandwidth. I think that lessening that problem will be the major benefit of making larger shared_buffers settings practical. -- Peter Geoghegan -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
