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Re: postgres 7.4 at 100%

From: Richard Huxton <dev(at)archonet(dot)com>
To: Chris Cheston <ccheston(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: postgres 7.4 at 100%
Date: 2004-06-25 09:09:51
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Chris Cheston wrote:
> Hi all,
> I was running Postgres 7.3 and it was running at about 15% with my
> application. On Postgres 7.4 on another box, it was running at 100%...

People are going to need more information. Are you talking about 
CPU/disk IO/memory?

> My settings are default on both boxes I think.

Doubtful - PG crawls with the default settings. Check your old 
postgresql.conf file and compare. Also, read the tuning article at:

> There are only about 20 inserts per second, which is really low. 
> Anyone have any ideas as to something I have to do to Postgres 7.4 to
> change it from the default so that it's not eating up all my CPU?  I
> have no clue how to debug this...

What does top/vmstat/iostat show during heavy usage?

> Help please!!!!  Should I downgrade to 7.3 to see what happens?  BTW
> I'm running Postgres 7.3.2 on:
> Linux box 2.4.25-040218 #1 SMP Wed Feb 18 17:59:29 CET 2004 i686 i686
> i386 GNU/Linux
> on a single processor P4 1.4GHz, 512 MB RAM.  Does the SMP kernel do
> something with the single processor CPU? or should this not affect
> psql?

Don't know about the SMP thing. Unlikely that one of the big 
distributions would mess that up much though.

   Richard Huxton
   Archonet Ltd

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Subject: How can one see what queries are running withing a postgresinstance?
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Subject: postgres 7.4 at 100%

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