checking frequencies #1589

Job	Run time
macos-latest: clang++ Release Threads	28m 40s
macos-latest: clang++ Release OneTBB	3m 41s
macos-latest: clang++ Release PaRSEC	2m 41s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	28m 39s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	1m 31s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	1m 4s
macos-latest: clang++ Debug Threads	26m 2s
macos-latest: clang++ Debug OneTBB	4m 53s
macos-latest: clang++ Debug PaRSEC	2m 18s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	28m 0s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	1m 37s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	51s
	2h 9m 57s

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