Or you can use PERFMON. Check manual page for perfmon. It gives you access to internal counters of CPU.
Of course this is a subjective measurement, since, AFAIK, the counters are not kept separately for every process, but for entire system, including kernel. Maybe repeating the same measurement for many times, with a system running no other CPU consumers, you will get a more accurate measurement
As I said, multiple measurements provide better accuracy. Much better.
And as Joseph Koshy pointed out, the RDTSC instruction (works on Pentium i think) may even provide better accuracy then just measuring time. Using it in a cycle of measurements would provide relevant output, and perhaps more accurate then PERFMON (because of direct CPU access).
clock_gettime also provides nanoseconds resolution, as pointed out.
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