From: Greg Smith <gsmith@gregsmith.com>
To: Guillaume Smet <guillaume.smet@gmail.com>
Cc: pgsql-performance <pgsql-performance@postgresql.org>
Cc: Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Cc: Devrim GÜNDÜZ <devrim@commandprompt.com>
Subject: Re: More shared buffers causes lower performances
Date: Wed, 26 Dec 2007 18:35:33 -0500 (EST)
Message-ID: <Pine.GSO.4.64.0712261816520.16448@westnet.com> (raw)
In-Reply-To: <1d4e0c10712261453s4b171452g8aa30a1124f8fff1@mail.gmail.com>
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<1d4e0c10712261453s4b171452g8aa30a1124f8fff1@mail.gmail.com>
On Wed, 26 Dec 2007, Guillaume Smet wrote:
> beta RPMs are by default compiled with --enable-debug and
> --enable-cassert which doesn't help them to fly fast...
Got that right. Last time I was going crazy after running pgbench with
those options and not having realized what I changed, I was getting a 50%
slowdown on results that way compared to without the debugging stuff.
Didn't realize it scaled with shared_buffers though.
> Really sorry for the noise
Nothing to be sorry for, I know I wasn't aware the beta RPMs were compiled
that way. Probably need to put a disclaimer about that fact *somewhere*.
It's unfortunate for you, but I know I'm glad you run into it rather than
someone who wouldn't have followed through to figure out the cause.
--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD
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To: pgsql-performance@postgresql.org
Cc: gsmith@gregsmith.com, guillaume.smet@gmail.com, stefan@kaltenbrunner.cc, devrim@commandprompt.com
Subject: Re: More shared buffers causes lower performances
In-Reply-To: <Pine.GSO.4.64.0712261816520.16448@westnet.com>
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