On 2013-12-05 17:46:44 +0200, Metin Doslu wrote: > I tried your patches on next link. As you suspect I didn't see any > improvements. I tested it on PostgreSQL 9.2 Stable. You tested the correct branch, right? Which commit does "git rev-parse HEAD" show? But generally, as long as your profile hides all the important information behind the hypervisor's cost, you're going to have a hard time analyzing the problems. You really should try to reproduce the problems on native hardware (as similar to the host hardware as possible), to get accurate data. On CPU bound workloads that information is often transportable to the virtual world. Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance