linux - Outliers during Performance Evaluation -

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I'm trying to measure some performance using Intels RDTSC, and it's variations that occur during different testers In most cases, my benchmark in C requires 3000000 Mio cycles, however, in some cases the same execution takes 5000000, it is almost two times more. I tried not to have any intensive workload running in parallel so that I get good performance estimates. Any ideas where this huge time difference can come? I know that there can be interconnection and stuff, but I did not expect such a great variety in time!

PS: I'm running it on a Pentium processor on which Linux is running.

Thanks for the response, John

I think the answer is:

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You have insufficient control over a modern OS.

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