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[minor] delete logging in tutorial/chapter6; update comments; change … #223

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Job	Run time
build (3.9, openmpi)	4m 18s
build (3.10, openmpi)	4m 12s
build (3.11, openmpi)	3m 52s
build (3.12, mpich)	7m 10s
build (3.12, openmpi)	6m 53s
	26m 25s