On Thu, Mar 1, 2012 at 10:13 PM, Tomas Vondra <tv@xxxxxxxx> wrote: > > Maybe. I still am not sure how fsync=off affects the eviction in your > opinion. I think it does not (or just very remotely) and you were saying > the opposite. IMHO the eviction of (dirty) buffers is either very fast > or slow, no matter what the fsync setting is. I was thinking page cleanup, but if you're confident it doesn't happen on a read-only database, I'd have to agree on all your other points. I have seen a small amount of writes on a read-only devel DB I work with, though. Usually in the order of 100kb/s writes per 10mb/s reads - I attributed that to page cleanup. In that case, it can add some wait time to fsync, even though it's really a slow volume of writes. If you're right, I'm thinking, it may be some other thing... atime updates maybe, I'd have to check the filesystem configuration I guess. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
