fixing expectation value of using the singles #1881

Job	Run time
macos-latest: clang++ Release Threads	15m 8s
macos-latest: clang++ Release OneTBB	1m 28s
macos-latest: clang++ Release PaRSEC	1m 52s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	37m 48s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 59s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	1m 55s
macos-latest: clang++ Debug Threads	33m 6s
macos-latest: clang++ Debug OneTBB	1m 42s
macos-latest: clang++ Debug PaRSEC	1m 55s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	52m 0s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	2m 11s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	2m 15s
	2h 34m 19s

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