/usr/bin/mb-mpi is in mrbayes-mpi 3.2.3+dfsg-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/bin/sh
# To use more than one processor set MPI_OPTIONS - eg.
#
# export MPI_OPTIONS="-np 4"
exec mpirun `echo $MPI_OPTIONS` /usr/lib/mrbayes-mpi/mb-mpi "$@"
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