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From: Greg Smith <gsmith@gregsmith.com>
To: pgsql-performance@postgresql.org
Subject: Re: PostgreSQL 8.0 occasionally slow down
Date: Mon, 2 Jul 2007 18:21:40 -0400 (EDT)
Message-ID: <Pine.GSO.4.64.0707021819410.11762@westnet.com> (raw)
In-Reply-To: <97e6e20f0706281904v4b7c4a97p570deda85e590ee4@mail.gmail.com>
References: <97e6e20f0706272354m5e42c91em177c8b80abb2ea52@mail.gmail.com>
	<468361A9.1040308@archonet.com>
	<97e6e20f0706280101y543b871ao4cbf85e57f07f7e9@mail.gmail.com>
	<46836B66.7050109@archonet.com>
	<97e6e20f0706280117h20ab2e03n770abc588f17742@mail.gmail.com>
	<46837C50.20603@archonet.com>
	<97e6e20f0706281904v4b7c4a97p570deda85e590ee4@mail.gmail.com>

On Fri, 29 Jun 2007, Ho Fat Tsang wrote:

> I noticed that for each time the pgsql slow down, there is a short 
> period a process called "pdflush" eating up lot of I/O. I've goolgled 
> and know it is a process for writing dirty pages back to the disk by the 
> Linux kernel.

The pdflush documentation is really spread out, you may find my paper at 
http://www.westnet.com/~gsmith/content/linux-pdflush.htm a good place to 
start looking into that.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD



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