On Mon, Oct 10, 2016 at 9:44 AM, Bruce Momjian <br...@momjian.us> wrote: > On Thu, Oct 6, 2016 at 02:38:56PM -0400, Robert Haas wrote: >> I decided to do some testing on hydra (IBM-provided community >> resource, POWER, 16 cores/64 threads, kernel 3.2.6-3.fc16.ppc64) using >> the newly-enhanced wait event stuff to try to get an idea of what >> we're waiting for during pgbench. I did 30-minute pgbench runs with >> various configurations, but all had max_connections = 200, >> shared_buffers = 8GB, maintenance_work_mem = 4GB, synchronous_commit = >> off, checkpoint_timeout = 15min, checkpoint_completion_target = 0.9, >> log_line_prefix = '%t [%p] ', max_wal_size = 40GB, log_checkpoints = >> on. During each run, I ran this psql script in another window and >> captured the output: > > This is a great study that shows how the new instrumentation has given > us a new window into performance. I am frankly surprised we got as far > as we did in finding performance bottlenecks before we had this > instrumentation.
Thanks, and +1. -- 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
