Update mdi.py #1377

Job	Run time
windows (windows-latest)	2m 31s
conda (ubuntu-latest)	1m 13s
posix (ubuntu-latest, OFF)	10m 33s
posix (ubuntu-latest, ON)	12m 1s
posix (ubuntu-latest, mpich, OFF)	12m 0s
posix (ubuntu-latest, mpich, ON)	12m 0s
posix (ubuntu-latest, openmpi, OFF)	11m 59s
posix (ubuntu-latest, openmpi, ON)	11m 59s
posix (macos-latest, OFF)	1m 4s
posix (macos-latest, ON)	1m 14s
posix (macos-latest, mpich, OFF)	2m 15s
posix (macos-latest, mpich, ON)	2m 24s
	1h 21m 13s

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