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Test results for Intel's Sandy Bridge processor
Author:  Date: 2015-12-25 15:10
Why microseconds ? It would be more precise if you measured the difference using different frequency as most likely it is measured internally in cycles. Something like internal counter to shut down or power up unofficial ports (which rises the question how many of them are there, actually). Switching time is most likely limited by the time necessary to flush the internal compiled code (as confirmed by some polymorphic code tests) and probably the interpreter (decoder), should they decrease the timeout, there might be some decent performance drop.
 
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