How to show the true wall time instead of cpu_time?

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Do you have the benchmarks available to the public?

Details are posted in this blog post (written in Japanese) in 2018.
I uploaded the source file used for the measurement to GitHub.

Any thought on why omp_get_wtime timing is so different from system_clock ?

Sorry, I am not sure in detail. Parallelization with OpenMP (forking and joining threads) may have some effect.

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