I (a single user) am running N separate MPI applications doing 1 to N broadcasts over PVM, each MPI application is started on each machine simultaneously by PVM - the reasons are back in the post history.
The problem is that they somehow collide - yes I know this should not happen, the question is why. --- On Wed, 11/8/10, Richard Treumann <treum...@us.ibm.com> wrote: From: Richard Treumann <treum...@us.ibm.com> Subject: Re: [OMPI users] MPI_Bcast issue To: "Open MPI Users" <us...@open-mpi.org> Received: Wednesday, 11 August, 2010, 11:34 PM 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 -----Inline Attachment Follows----- _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users
