I can't imagine how you would do that - only thing I can think of would be to start your "child" processes as one job, then start your "parent" processes and have them do an MPI_Comm_join with the child job.
That said, I can't imagine that comm_spawn is -that- slow to make much difference to an HPC application! At least, not in anything I've measured. On Jan 27, 2010, at 3:24 PM, Jaison Paul wrote: > Hi, I am just reposting my early query once again. If anyone one can give > some hint, that would be great. > > Thanks, Jaison > ANU > > Jaison Paul wrote: >> Hi All, >> >> I am trying to use MPI for scientific High Performance (hpc) applications. I >> use MPI_Spawn to create child processes. Is there a way to start child >> processes early than the parent process, using MPI_Spawn? >> >> I want this because, my experiments showed that the time to spawn the >> children by parent is too long for HPC apps which slows down the whole >> process. If the children are ready when parent application process seeks for >> them, that initial delay can be avoided. Is there a way to do that? >> >> Thanks in advance, >> >> Jaison >> Australian National University >> _______________________________________________ >> 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
