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
