You said "separate MPI applications doing 1 to > N broadcasts over PVM". You do not mean you are using pvm_bcast though - right?
If these N MPI applications are so independent that you could run one at a time or run them on N different clusters and still get the result you want (not the time to solution) then I cannot imagine how there could be cross talk. I have been assuming that when you describe this as an NxN problem, you mean there is some desired interaction among the N MPI worlds. If I have misunderstood and the N MPI worlds stared with N mpirun operations under PVM are each semantically independent of the other (N-1) then I am totally at a loss for an explanation. 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 users-boun...@open-mpi.org wrote on 08/11/2010 08:59:16 PM: > [image removed] > > Re: [OMPI users] MPI_Bcast issue > > Randolph Pullen > > to: > > Open MPI Users > > 08/11/2010 09:01 PM > > Sent by: > > users-boun...@open-mpi.org > > Please respond to Open MPI Users > > 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 > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
