Serge <sk...@ap.smu.ca> writes: > However, there are cases when being able to specify the hostfile is > important (hybrid jobs, users with MPICH jobs, etc.).
[I don't understand what MPICH has to do with it.] > For example, > with Grid Engine I can request four 4-core nodes, that is total of 16 > slots. But I also want to specify how to distribute processes on the > nodes, so I create the file 'hosts' > > node01 slots=1 > node02 slots=1 > node03 slots=1 > node04 slots=1 > > and modify the line in the submission script to: > mpirun -hostfile hosts ./program Regardless of any open-mpi bug, I'd have thought it was easier just to use -npernode in that case. What's the problem with that? It seems to me best generally to control the distribution of processes with mpirun on the SGE-allocated nodes than to concoct host files as we used to do here, e.g. to get -byslot v. -bynode behaviour (or vice versa).
