what kind of communication between nodes do you have - tcp, openib ( IB/IWARP ) ? you can try
mpirun -np 4 -host node1,node2 -mca btl tcp,self random On Wed, Feb 4, 2009 at 1:21 AM, Ralph Castain <r...@lanl.gov> wrote: > Could you tell us which version of OpenMPI you are using, and how it was > configured? > > Did you install the OMPI libraries and binaries on both nodes? Are they in > the same absolute path locations? > > Thanks > Ralph > > > On Feb 3, 2009, at 3:46 PM, Robertson Burgess wrote: > >> Dear users, >> I am quite new to OpenMPI, I have compiled it on two nodes, each node with >> 8 CPU cores. The two nodes are identical. The code I am using works in >> parallel across the 8 cores on a single node. However, whenever I try to run >> across both nodes, OpenMPI simply hangs. There is no output whatsoever, when >> I run it in background, outputting to a log file, the log file is always >> empty. The cores do not appear to be doing anything at all, either on the >> host node or on the remote node. This happens whether I am running my code, >> or even if I when I tell it to run a process that doesn't even exist, for >> instance >> >> mpirun -np 4 -host node1,node2 random >> >> Simply results in the terminal hanging, so all I can do is close the >> terminal and open up a new one. >> >> mpirun -np 4 -host node1,node2 random >& log.log & >> >> simply produces and empty log.log file >> >> I am running Redhat Linux on the systems, and compiled OpenMPI with the >> Intel Compilers 10.1. As I've said, it works fine on one node. I have set up >> both nodes such that they can log into each other via ssh without the need >> for a password, and I have altered my .bashrc file so the PATH and >> LD_LIBRARY_PATH include the appropriate folders. >> I have looked through the FAQ and mailing lists, but I was unable to find >> anything that really matched my problem. Any help would be greatly >> appreciated. >> >> Sincerely, >> Robertson Burgess >> University of Newcastle >> >> _______________________________________________ >> 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 >
