Thanks! That worked.
From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of Ralph Castain Sent: Wednesday, April 17, 2013 7:45 AM To: Open MPI Users Subject: [External] Re: [OMPI users] Change In Behavior Running on Multiple Nodes Hmmm...yes, I see what you mean. Try using "-default-hostfile mpimachines" instead of -hostfiles. I think that's the problem - at least, it fixed it for me. On Apr 17, 2013, at 7:08 AM, "Welder, Wallace T PWR" <wallace.wel...@pwr.utc.com> wrote: I’ve recently tried running OpenMPI v1.6.4 on multiple nodes and have noticed a change in behavior that I don’t understand. In OpenMPI version 1.4.x, 1.5.x and 1.6.1, I could run a job spanning two nodes as shown below. The procedure results in 8 processes running on the first node and 8 on the second node. mpirun –hostfile mpimachines –n 1 host.exe : -n 15 node.exe where the file mpimachines looks like: node1 slots=8 node2 slots=8 In OpenMPI v1.6.2 and v1.6.4 (haven’t tried v1.6.3) when I try to run the same way, all the processes start on node1 and none start on node2. I’ve noticed there are now runtime flags -bynode and –byslot, but I haven’t had any success with those. I’ve also tried changing the mpimachines file to look like: node1 slots=8 max-slots=8 node2 slots=8 max-slots=8 When I tried this, I got a runtime error saying there were not enough slots in the system to satisfy the 15 slots that were requested by the application node.exe. I think there is a hint in here about my problem, but I haven’t been able to figure out what it is yet. Can anyone let me know how the process has changed with these newer versions of OpenMPI? Thanks, Wallace _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users
