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From: Alvaro Herrera <alvherre@commandprompt.com>
To: Rajesh Kumar Mallah <mallah.rajesh@gmail.com>
Cc: Kevin Grittner <kevin.grittner@wicourts.gov>
Cc: pgsql-performance <pgsql-performance@postgresql.org>
Subject: Re: cpu bound postgresql setup.
Date: Thu, 24 Jun 2010 14:58:23 -0400
Message-ID: <1277405847-sup-5188@alvh.no-ip.org> (raw)
In-Reply-To: <AANLkTik0XxiLb-1doYhioxPKdrWjOrOcbIjxpH0us9YJ@mail.gmail.com>
References: <AANLkTimYZkyh7njK9QzJnaPJwXIiRrSOgedChwRTHdKL@mail.gmail.com>
	<4C220163020000250003291B@gw.wicourts.gov>
	<AANLkTinpclmoagyu2pdNhFYNw3cObC5uc68ePZGW5vXn@mail.gmail.com>
	<4C22096E020000250003292B@gw.wicourts.gov>
	<AANLkTimuGbbQ3covXd3ciZSa_p1Zqf4U7HUgas3cVx6Q@mail.gmail.com>
	<4C220C2C0200002500032930@gw.wicourts.gov>
	<AANLkTikGb5KxmJEoC2dXubxMc5LKCjj8_prtDJJkWvCy@mail.gmail.com>
	<AANLkTikOTRq8O4NGXosoQ2fvdjsRnknEt6ziytK0tmm_@mail.gmail.com>
	<4C23332E0200002500032A1C@gw.wicourts.gov>
	<AANLkTik0XxiLb-1doYhioxPKdrWjOrOcbIjxpH0us9YJ@mail.gmail.com>

Excerpts from Rajesh Kumar Mallah's message of jue jun 24 13:25:32 -0400 2010:

> What prompted me to post to list is that the server transitioned from
> being IO bound to CPU bound and 90% of syscalls being
> lseek(XXX, 0, SEEK_END) = YYYYYYY

It could be useful to find out what file is being seeked.  Correlate the
XXX with files in /proc/<pid>/fd (at least on Linux) to find out more.

-- 
Álvaro Herrera <alvherre@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support



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