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Re: Pgstat.tmp file activity

From: "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
To: Dan Austin <DAustin(at)au(dot)westfield(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-admin(at)postgresql(dot)org
Subject: Re: Pgstat.tmp file activity
Date: 2005-12-27 21:08:44
Message-ID: 20051227210844.GP72143@pervasive.com (view raw or flat)
Thread:
Lists: pgsql-admin
On Fri, Dec 23, 2005 at 04:50:32PM +1100, Dan Austin wrote:
> > [...]
> > Right, the file is fully written under a temp name, and then 
> > rename()'d
> 
> This makes sense and is almost certainly not the cause of the problem.
> Although there is a lot more data being written to that file than I
> would have thought.
> 
> One of Sun's kernel engineers has come up with a solution that seems to
> have fixed the problem. Instead of increasing work_mem (which we still
> might do) we've mounted a swapfs partition over the pg temp directory:
> 
>   # mount | grep pgsql_tmp
>   /export/data/pgsql/data/base/64920741/pgsql_tmp on swap [...]
> 
> This has actually reduced the disk activity considerably. So far, the
> blocking problem seems to have gone.
> 
> Now to find some Postgres DBAs in Sydney to do some review / tuning of
> our memory settings. :-)

Note also that Solaris by default limits the amount of memory used for
disk caching, which is Not Good for PostgreSQL. IIRC this can be changed
with a sysctl, but I don't recall the details off-hand.
-- 
Jim C. Nasby, Sr. Engineering Consultant      jnasby(at)pervasive(dot)com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461

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