Basic mpirun order is, “mpirun -np 4 ./Bin/regcmMPI test_001.in”.
But, it will be trouble thing if the run use the cpu at log-in node.
So, allocating cpu where you want to allocate is necessary.
under the “MPICH1” environment,
(1) creates mpd.hosts file for allocating CPUs
f00:0 (<- the node for log-in)
total cpu is 12.
mpirun -np 12 -machinefile mpd.hosts ./Bin/regcmMPI test_001.in
then, allocating cpu to log-in node can be avoided.