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From: Johann Schuster <johann.schuster@unibw.de>
To: linux-kernel@vger.kernel.org
Subject: Measuring cpu time using getrusage
Date: Wed, 14 Feb 2007 14:17:19 +0100	[thread overview]
Message-ID: <45D30BDF.5010608@unibw.de> (raw)

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

             reply	other threads:[~2007-02-14 15:26 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-14 13:17 Johann Schuster [this message]
2007-02-17 12:09 ` Tim Schmielau

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