Vineet, probably *not* what you expect, but I guess you can try
$ cat host-file host1 slots=3 host2 slots=3 host3 slots=3 $ mpirun -hostfile host-file -np 2 ./EXE1 : -np 1 ./EXE2 : -np 2 ./EXE1 : -np 1 ./EXE2 : -np 2 ./EXE1 : -np 1 ./EXE2 Cheers, Gilles On Mon, Dec 21, 2020 at 10:26 PM Vineet Soni via users <users@lists.open-mpi.org> wrote: > > Hello, > > I'm having touble using the MPMD hostfile in which I want to place 2 > executables on the same nodes. > > For example, I can do this using Intel MPI by: > $ mpirun -machine host-file -n 6 ./EXE1 : -n 3 ./EXE2 > $ cat host-file > host1:2 > host2:2 > host3:2 > host1:1 > host2:1 > host3:1 > > This would place 2 MPI processes of EXE1 and 1 MPI process of EXE2 on host1. > > However, I get an error if I define the same hostname twice in the hostfile > of OpenMPI: > $ mpirun -hostfile host-file -np 6 ./EXE1 : -np 3 ./EXE2 > $ cat host-file > host1 slots=2 max_slots=3 > host2 slots=2 max_slots=3 > host3 slots=2 max_slots=3 > host1 slots=1 max_slots=3 > host2 slots=1 max_slots=3 > host3 slots=1 max_slots=3 > > Is there a way to place both executables on the same hosts using a hostfile? > > Thanks in advance. > > Best, > Vineet
