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* Measuring cpu time using getrusage
@ 2007-02-14 13:17 Johann Schuster
  2007-02-17 12:09 ` Tim Schmielau
  0 siblings, 1 reply; 2+ messages in thread
From: Johann Schuster @ 2007-02-14 13:17 UTC (permalink / raw)
  To: linux-kernel

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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2007-02-14 13:17 Measuring cpu time using getrusage Johann Schuster
2007-02-17 12:09 ` Tim Schmielau

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