From: Robert Creager <Robert_Creager@LogicalChaos.org>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: PGPerformance <pgsql-performance@postgresql.org>
Cc: Andy Hewitt <Andy_Hewitt@StorageTek.com>
Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS
Date: Sun, 17 Jul 2005 23:56:30 -0600
Message-ID: <20050717235630.26a7c979@thunder.logicalchaos.org> (raw)
In-Reply-To: <24520.1121659853@sss.pgh.pa.us>
References: <20050717213416.59dcb52e@thunder.logicalchaos.org>
<24520.1121659853@sss.pgh.pa.us>
When grilled further on (Mon, 18 Jul 2005 00:10:53 -0400),
Tom Lane <tgl@sss.pgh.pa.us> confessed:
> The context swap problem was no worse in 8.0 than in prior versions,
> so that hardly seems like a good explanation. Have you tried reverting
> to the cron-based vacuuming method you used in 7.4?
>
I've "vacuum_cost_delay = 10" in the conf file for 803. hit, miss, dirty and
limit are 1, 10, 20 and 200 respectively. Could that be contributing to the
problem? I'll know more in an hour or so with 741 running and cron vac and the
same load.
Cheers,
Rob
--
23:53:53 up 4 days, 3:28, 6 users, load average: 0.11, 0.13, 0.11
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, tgl@sss.pgh.pa.us, Andy_Hewitt@StorageTek.com
Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS
In-Reply-To: <20050717235630.26a7c979@thunder.logicalchaos.org>
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