Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > Have you checked whether the spikes correlate with checkpoints? > Turn on log_checkpoints and watch for awhile. If so, fooling with > the checkpoint parameters might give some relief. If that by itself doesn't do it, I've found that making the background writer more aggressive can help. We've had good luck with: bgwriter_lru_maxpages = 1000 bgwriter_lru_multiplier = 4.0 If you still have checkpoint-related latency issues, you could try scaling back shared_buffers, letting the OS cache handle more of the data. Also, if you have a RAID controller with a battery-backed RAM cache, make sure it is configured for write-back. -Kevin -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
