From: Robert Creager <Robert_Creager@LogicalChaos.org>
To: Robert Creager <Robert_Creager@StorageTek.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Creager <Robert_Creager@StorageTek.com>
Cc: pgsql-performance@postgresql.org, Andy Hewitt III <ralph_hewitt_iii@StorageTek.com>
Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS
Date: Tue, 19 Jul 2005 22:49:08 -0600
Message-ID: <20050719224908.15415222@thunder.logicalchaos.org> (raw)
In-Reply-To: <20050719120951.00002520@C118181.stortek.com>
References: <20050718114952.00004ac5@C118181.stortek.com>
<15472.1121709173@sss.pgh.pa.us>
<20050719105014.00007635@C118181.stortek.com>
<7322.1121792062@sss.pgh.pa.us>
<20050719120951.00002520@C118181.stortek.com>
When grilled further on (Tue, 19 Jul 2005 12:09:51 -0600),
Robert Creager <Robert_Creager@StorageTek.com> confessed:
> On Tue, 19 Jul 2005 12:54:22 -0400
> Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> > Hmm, I hadn't thought about the possible impact of multiple concurrent
> > vacuums. Is the problem caused by that, or has performance already gone
> > into the tank by the time the cron-driven vacuums are taking long enough
> > to overlap?
>
>
> I'll re-start the database, vacuum full analyze and restart the runs without
the
> cron vacuum running.
>
It took a few hours, but the problem did finally occur with no vacuum running on
803. CS is averaging 72k. I cannot quantitatively say it took longer to
reproduce than with the vacuums running, but it seemed like it did.
Can any information be gotten out of this? Should I try CVS HEAD?
Thoughts?
Thanks,
Rob
--
22:41:36 up 6 days, 2:16, 6 users, load average: 0.15, 0.21, 0.30
Linux 2.6.5-02 #8 SMP Mon Jul 12 21:34:44 MDT 2004
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To: pgsql-performance@postgresql.org
Cc: Robert_Creager@LogicalChaos.org, Robert_Creager@StorageTek.com, tgl@sss.pgh.pa.us, ralph_hewitt_iii@StorageTek.com
Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS
In-Reply-To: <20050719224908.15415222@thunder.logicalchaos.org>
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