On 2015-03-15 20:42:51 +0300, Ilya Kosmodemiansky wrote: > On Sun, Mar 15, 2015 at 8:20 PM, Andres Freund <andres@xxxxxxxxxxxxxxx> wrote: > > On 2015-03-15 11:09:34 -0600, Scott Marlowe wrote: > >> shared_mem of 12G is almost always too large. I'd drop it down to ~1G or so. > > > > I think that's a outdated wisdom, i.e. not generally true. > > Quite agreed. With note, that proper configured controller with BBU is needed. That imo doesn't really have anything to do with it. The primary benefit of a BBU with writeback caching is accelerating (near-)synchronous writes. Like the WAL. But, besides influencing the default for wal_buffers, a larger shared_buffers doesn't change the amount of synchronous writes. Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
