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PostgreSQL 8.4 performance tuning questions

From: Rauan Maemirov <rauan(at)maemirov(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: PostgreSQL 8.4 performance tuning questions
Date: 2009-07-30 12:06:40
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Hi, list. I've just upgraded pgsql from 8.3 to 8.4. I've used pgtune
before and everything worked fine for me.

And now i have ~93% cpu load. Here's changed values of config:

default_statistics_target = 50
maintenance_work_mem = 1GB
constraint_exclusion = on
checkpoint_completion_target = 0.9
effective_cache_size = 22GB
work_mem = 192MB
wal_buffers = 8MB
checkpoint_segments = 16
shared_buffers = 7680MB
max_connections = 80

My box is Nehalem 2xQuad 2.8 with RAM 32Gb, and there's only
postgresql working on it.

For connection pooling i'm using pgbouncer's latest version with
pool_size 20 (used 30 before, but now lowered) and 10k connections.

What parameters i should give more attention on?


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