Measuring CPU time with getrusage

From: Marco Almeida
Date: Sat Jan 16 2010 - 09:04:22 EST


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.

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