> hosts ranks > =========== > node0 1,2,4 > node1 3,4,6 I guess there must be a typo: You can't assign one rank (4) to two nodes.... And ranks start from 0 not from 1.
Check this site, http://www.open-mpi.org/faq/?category=running#mpirun-host there might be some inforegarding your problem. Jody
