Randolf

I am confused about using multiple, concurrent mpirun operations. If there are M uses of mpirun and each starts N tasks (carried out under pvm or any other way) I would expect you to have M completely independent MPI jobs with N tasks (processes) each. You could have some root in each of the M MPI jobs do an MPI_Bcast to the other N-1) in that job but there is no way in MPI (without using accept.connect) to get tasks of job 0 to give data to tasks of jobs 1-(m-1).

With M uses of mpirun, you have M worlds that are forever isolated from the other M-1 worlds (again, unless you do accept/connect)

In what sense are you treating this as an single MxN application? ( I use M & N to keep them distinct. I assume if M == N, we have your case)

Dick Treumann - MPI Team
IBM Systems & Technology Group
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