linux-kernel - Measuring cpu time using getrusage

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Message-ID: <45D30BDF.5010608@unibw.de>
Date:	Wed, 14 Feb 2007 14:17:19 +0100
From:	Johann Schuster <johann.schuster@...bw.de>
To:	linux-kernel@...r.kernel.org
Subject: Measuring cpu time using getrusage

Hello,

currently i'm trying to measure the cpu times for
numerical algorithms written in C using two calls of
getrusage() and then calculating the time difference.

According to the man page of getrusage i looked at the
user time of my process. Surprisingly the measured user
times vary strongly depending on the system load of the
machine.
A heavy system load nearly doubles the measured time
for my routine.

Does anyone know a better way to measure the used
cpu cycles of a given process (or part of a program)
or can anyone give me a hint if i missed some important
fact.

Any help appreciated. Thank you in advance.

Johann Schuster
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