Accurately measure CPU cycles used by a program? thanks

From: Wanghong Yuan (wyuan1@ews.uiuc.edu)
Date: Mon Apr 29 2002 - 17:15:14 EST

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Is there any package or program, which can be used to accurately measure the
CPU cycles used by a program? I think the following code can only provide an
inaccurate one, beause it may count on the waiting time of the program.

gettimeofday(t1)
runprogam
gettimeofday(t2)
t2-t1

If I need to instrument the kernel, which part I should investigate? Thanks
a lot in advance

Wanghong

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