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The best time measured is the time of execution with least switching to other processes. So, it's actually the closest to the real time.

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No, there are other things which affect timing besides switching to other processes. For example, virt:physical mapping of the process memory affects cache performance unpredictably, see http://d3s.mff.cuni.cz/publications/download/hocko-sipew10.p...

No, there are other things which affect timing besides switching to other processes. For example, virt:physical mapping of the process memory affects cache performance unpredictably.

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