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[OpenMP] [test] Test omp_get_wtime for invariants

Authored by protze.joachim on Oct 25 2021, 7:55 AM.



As discussed in D108488, testing for invariants of omp_get_wtime would be more reliable than testing for duration of sleep, as return from sleep might be delayed due to system load.

Alternatively/in addition, we could compare the time measured by omp_get_wtime to time measured with C++11 chrono (for portability?).

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