From: "Qingqing Zhou" <zhouqq@cs.toronto.edu>
Subject: Re: performance problems ... 100 cpu utilization
Date: Thu, 14 Jul 2005 11:11:29 +0800
Organization: Hub.Org Networking Services
Lines: 31
Message-ID: <db4l9c$1g4t$1@news.hub.org>
References: <42D567DB.6000100@works4me.com>
Reply-To: "Qingqing Zhou" <zhouqq@cs.toronto.edu>
To: pgsql-performance@postgresql.org


"Dennis" <dennis@works4me.com> writes
>
> checking the status of connections at this point ( ps -eaf | grep
> "postgres:")  where the CPU is maxed out I saw this:
>
> 127 idle
> 12 bind
> 38 parse
> 34 select
>

Are you sure 100% CPU usage is solely contributed by Postgresql? Also, from
the ps status you list, I can hardly see that's a problem because of problem
you mentioned below.

>
> I know there has been discussion about problems on Xeon MP systems. Is
> this what we are running into? Or is something else going on? Is there
> other information I can provide that might help determine what is going
on?
>

Here is a talk about Xeon-SMP spinlock contention problem:
http://archives.postgresql.org/pgsql-performance/2005-05/msg00441.php


Regards,
Qingqing