linux-kernel - Measuring CPU time with getrusage

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Message-ID: <x6pr5a18dk.wl%malmeida@netc.pt>
Date:	Sat, 16 Jan 2010 13:34:15 +0000
From:	Marco Almeida <malmeida@...c.pt>
To:	linux-kernel@...r.kernel.org
Subject: Measuring CPU time with getrusage

Hi,

I'm trying to measure the CPU time of several algorithms (some written
in C others in Python) by using getrusage() after wait() for the child
process to end.

On a machine with hypterthreading, the measured user times depend a
lot on the system load of the machine. A heavy system load sometimes
increases the measured time by 10x!

Is there a better way to measure the used CPU time of a given process
(or part of a program) or have I missed some important fact?

Any help appreciated. 

Thanks,
Marco
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