From: Neil Conway <neilc@samurai.com>
To: PostgreSQL <martin@portant.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: 8.1beta3 performance
Date: Mon, 31 Oct 2005 21:06:15 -0500
Message-ID: <1130810775.8561.20.camel@localhost.localdomain> (raw)
In-Reply-To: <dk68ku$2lqa$1@news.hub.org>
References: <dk68ku$2lqa$1@news.hub.org>
On Mon, 2005-31-10 at 17:16 -0600, PostgreSQL wrote:
> We're running 8.1beta3 on one server and are having ridiculous performance
> issues. This is a 2 cpu Opteron box and both processors are staying at 98
> or 99% utilization processing not-that-complex queries. Prior to the
> upgrade, our I/O wait time was about 60% and cpu utilization rarely got very
> high, now I/O wait time is at or near zero.
Have you done anything to verify that this is actually a problem with
8.1, and not some other change that was made as part of the upgrade
process? For example, if ANALYZE hasn't been re-run, that could cause
the plans chosen by the optimizer to be completely different.
-Neil
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To: pgsql-performance@postgresql.org
Cc: neilc@samurai.com, martin@portant.com
Subject: Re: 8.1beta3 performance
In-Reply-To: <1130810775.8561.20.camel@localhost.localdomain>
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