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 Dept X2ZA / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601 Tele (845) 433-7846 Fax (845) 433-8363
