I have a simple hello program where each child prints out the hostname of the node it is running on. When I run this (on a bproc machine) with -np 4 and no host file it launches one process per node on each of the first 4 avaliable nodes. ie:
$ mpirun -np 4 ./mpi_hello n1 hello n3 hello n2 hello n4 hello What I am trying to get is to launch 2 processes per node, or this output: $ mpirun -np 4 $magic_arg ./mpi_hello n1 hello n1 hello n2 hello n2 hello ita, Josh
