Ok, make sense .. I will update that as well and report back. Thank you for your advice.
Sébastien On Wed, Sep 12, 2012 at 8:04 PM, John R Pierce <pie...@hogranch.com> wrote: > On 09/12/12 4:49 PM, Sébastien Lorion wrote: > >> You set shared_buffers way below what is suggested in Greg Smith book >> (25% or more of RAM) .. what is the rationale behind that rule of thumb ? >> Other values are more or less what I set, though I could lower the >> effective_cache_size and vfs.zfs.arc_max and see how it goes. >> > > I think those 25% rules were typically created when ram was no more than > 4-8GB. > > for our highly transactional workload, at least, too large of a > shared_buffers seems to slow us down, perhaps due to higher overhead of > managing that many 8k buffers. I've heard other read-mostly workloads, > such as data warehousing, can take advantage of larger buffer counts. > > > > > -- > john r pierce N 37, W 122 > santa cruz ca mid-left coast > > > > > -- > Sent via pgsql-general mailing list (pgsql-general@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/**mailpref/pgsql-general<http://www.postgresql.org/mailpref/pgsql-general> >
