From: Ralph Mason <ralph.mason@telogis.com>
To: 'Mark Lewis' <mark.lewis@mir3.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Ever Increasing IOWAIT
Date: Mon, 21 May 2007 08:41:41 +1200
Message-ID: <005c01c79b1f$459c2160$d0d46420$@mason@telogis.com> (raw)
In-Reply-To: <1179496683.31471.72.camel@archimedes>
References: <011b01c798d5$141365a0$3c3a30e0$@mason@telogis.com>
<1179496683.31471.72.camel@archimedes>
>You're not swapping are you? One explanation could be that PG is
>configured to think it has access to a little more memory than the box
>can really provide, which forces it to swap once it's been running for
>long enough to fill up its shared buffers or after a certain number of
>concurrent connections are opened.
>
>-- Mark Lewis
No - no swap on this machine. The number of connections is stable.
Ralph
On Fri, 2007-05-18 at 10:45 +1200, Ralph Mason wrote:
> We have a database running on a 4 processor machine. As time goes by
> the IO gets worse and worse peeking at about 200% as the machine loads
> up.
>
>
>
> The weird thing is that if we restart postgres it’s fine for hours but
> over time it goes bad again.
>
>
>
> (CPU usage graph here
> http://www.flickr.com/photos/8347741@N02/502596262/ ) You can clearly
> see where the restart happens in the IO area
>
>
>
> This is Postgres 8.1.4 64bit.
>
>
>
> Anyone have any ideas?
>
>
>
> Thanks
>
> Ralph
>
>
>
>
>
> --
> Internal Virus Database is out-of-date.
> Checked by AVG Free Edition.
> Version: 7.5.432 / Virus Database: 268.15.9/573 - Release Date:
> 5/12/2006 4:07 p.m.
>
>
---------------------------(end of broadcast)---------------------------
TIP 7: You can help support the PostgreSQL project by donating at
http://www.postgresql.org/about/donate
--
Internal Virus Database is out-of-date.
Checked by AVG Free Edition.
Version: 7.5.432 / Virus Database: 268.15.9/573 - Release Date: 5/12/2006 4:07 p.m.
--
Internal Virus Database is out-of-date.
Checked by AVG Free Edition.
Version: 7.5.432 / Virus Database: 268.15.9/573 - Release Date: 5/12/2006 4:07 p.m.
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: ralph.mason@telogis.com, mark.lewis@mir3.com
Subject: Re: Ever Increasing IOWAIT
In-Reply-To: <005c01c79b1f$459c2160$d0d46420$@mason@telogis.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox