cleaned up before managing zero bcs #1457

Job	Run time
macos-latest: clang++ Release Threads	2m 27s
macos-latest: clang++ Release OneTBB	3m 5s
macos-latest: clang++ Release PaRSEC	2m 59s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	1m 38s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	1m 13s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	1m 9s
macos-latest: clang++ Debug Threads	2m 44s
macos-latest: clang++ Debug OneTBB	3m 25s
macos-latest: clang++ Debug PaRSEC	3m 2s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	1m 46s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	1m 7s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	1m 54s
	26m 29s

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