If I drop the number of threads to 10 as shown in your snippet, the context switches goes up to the 860k mark. Drop it to 2, and it averages out at over 1,100,000/s. Both for the empty loop.

Adding back the gettimeofday() and the best I can achieve if 170,000 even with just 2 threads and a single process.

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Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^9: OT How fast a cpu to overwhelm Time::HiRes by BrowserUk
in thread OT How fast a cpu to overwhelm Time::HiRes by zentara

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