On Mon, Mar 12, 2012 at 4:45 PM, Jeff Janes <jeff.ja...@gmail.com> wrote: > Rerunning all 4 benchmarks (both 16MB and 32MB wal_buffers on both > machines) with fsync=off (as well as synchronous_commit=off still) > might help clarify things.
I reran the 32-client benchmark on the IBM machine with fsync=off and got this: 32MB: tps = 26809.442903 (including connections establishing) 16MB: tps = 26651.320145 (including connections establishing) That's a speedup of nearly a factor of two, so clearly fsync-related stalls are a big problem here, even with wal_buffers cranked up through the ceiling. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
