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mpi: Prevent parallel halo exchanges #752

Job	Run time
pytest-mpi (pytest-mpi-docker-gcc-arm)	21m 17s
pytest-mpi (3.10)	46m 59s
pytest-mpi (pytest-mpi-docker-gcc)	29m 21s
pytest-mpi (pytest-mpi-docker-icx)	33m 1s
pytest-mpi (3.11)	45m 23s
	2h 56m 1s