working on the grid #1444

Job	Run time
macos-latest: clang++ Release Threads	30m 10s
macos-latest: clang++ Release OneTBB	4m 23s
macos-latest: clang++ Release PaRSEC	5m 35s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	51m 14s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 24s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	3m 56s
macos-latest: clang++ Debug Threads	32m 40s
macos-latest: clang++ Debug OneTBB	4m 31s
macos-latest: clang++ Debug PaRSEC	5m 30s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	57m 24s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	2m 18s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	3m 19s
	3h 23m 24s

Provide feedback