Re: [GENERAL] commit performance anomaly

2009-03-26 Thread Greg Smith
On Thu, 26 Mar 2009, Ed L. wrote: But I'm curious why 'commit' statements (as well as certain update statements) seem to have actually degraded (1ms vs 5ms on avg, 2ms vs 14ms in the 95th percentile, etc). When you commit something, it writes information to the write-ahead log (WAL) and then

[GENERAL] commit performance anomaly

2009-03-26 Thread Ed L.
I've been tracking the performance of our DB query statements across a number of fairly high-volume pg clusters for several years (combined 2700 tps, ~1.3TB). Last year, we started migrating off HP-UX IA64 servers running pg 8.1.x onto Linux quadcore x86_64 Blade servers running pg 8.3.x while