On Jul 12, 2010, at 9:07 AM, Brian Budge wrote: > Hi Jody - > > Thanks for the reply. is there a way of "fusing" intercommunicators? > Let's say I have a higher level node scheduler, and it makes a new > node available to a COMM that is already running. So the master > spawns another process for that node. How can the new process > communicate with the other already started processes?
They can connect/accept via ompi-server - checkout "man ompi-server". You can also have them all rendezvous at a common mpirun if you prefer by using the appropriate mca param to give the required contact info. > > Also, how can you specify with MPI_Comm_spawn/multiple() how do you > specify IP addresses on which to start the processes? Look at "man MPI_Comm_spawn" > > If my higher level node scheduler needs to take away a process from my > COMM, is it good/bad for that node to call MPI_Finalize as it exits? The entire job will automatically abort if it fails to call Finalize as this is considered an abnormal termination event. > > I would prefer not to use any of the MPI command-line utilities > (mpirun/mpiexec) if that's possible. Not possible at the moment. I have provided a patch to another user on this list that made it possible to use ompi-server as a rendezvous point for singletons, but that isn't in any formal release yet. > > Thanks, > Brian > > On Sat, Jul 10, 2010 at 11:53 PM, jody <jody....@gmail.com> wrote: >> Hi Brian >> When you spawn processes with MPI_Comm_spawn(), one of the arguments >> will be set to an intercommunicator of thes spawner and the spawnees. >> You can use this intercommunicator as the communicator argument >> in the MPI_functions. >> >> Jody >> On Fri, Jul 9, 2010 at 5:56 PM, Brian Budge <brian.bu...@gmail.com> wrote: >>> Hi all - >>> >>> I've been looking at the dynamic process features of mpi-2. I have managed >>> to actually launch processes using spawn, but haven't seen examples for >>> actually communicating once these processes are launched. I am additionally >>> interested in how processes created through multiple spawn calls can >>> communicate. >>> >>> Does anyone know of resources that describe these topics? My google-fu must >>> not be up to par :) >>> >>> Thanks, >>> Brian >>> >>> _______________________________________________ >>> 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 >> > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
