Hi Jodi, thanks for the quick answer!
> Have you tried the command ompi_info? > What is its output? No, I haven't. I can try this evening, when I'm back home from work. > > Furthermore, the command you gave > > mpirun -np 2 --hostfile /home/stephan/mpd.hosts > is incomplete. There is no executable. Sorry, it should correctly be mpirun -np 2 --hostfile /home/stephan/mpd.hosts /bin/hostname The output shows, that the program is only executed on the local machine. This is the same on each of the machines. > > Try to make sure wether your host file has the correct > format. If i remember correctly Open-MPI does not use > the same format for hostfiles as MPICH. Yes, thats true according to the documentation. There is a possibility to define the number of slots and the max-number of slots in OpenMPI, which I haven't seen in MPICH so far (at least not within the hostfile). But when I use a hostfile without a specification regarding the slots, e.g. shell$ cat my-hosts node0 node1 (which is the same as in MPICH), it should interpret the default values, i.e. slots=1 and max_slots=unlimited). That should work for that simple test. > See the FAQ for more info > http://www.open-mpi.org/faq/?category=running#mpirun-scheduling I also tried the way to specify the hosts in the command, e.g. mpirun --host -np 2 node0,node1 /bin/hostname but the result is the same. The program runs only on one host. > > If you don't use a hostfile, mpirun will start > all processes on the local machine. Yes, that's what it obviously does. It doesn't recognise the cluster partner in each direction... Kind Regards Stephan > On Tue, Apr 22, 2008 at 8:56 AM, <gildo....@gmx.de> wrote: > > Dear all, > > > > I wanted to compare MPICH and OpenMPI. MPICH works fine. So I installed > OpenMPI the same way (configure, make, make install). The commands are > found in the OpenMPI installation directory. > > > > When I tried to run programs I was a little bit confused, that there > seems not to be a default hosts-file like in MPICH. I included it in the > command with "--hostfile". > > > > When I now want to run my first test with > > > > mpirun -np 2 --hostfile /home/stephan/mpd.hosts > > > > I get the error-message: > > > > orted: command not found > > > > The "orted"-executable resides as well as the "mpirun"- and > "mpiexec"-executables in the directory /home/stephan/openmpi-install. "orted" > is also > found by "which orted". > > > > What might be the problem? How does "orted" work? I'm not conscious > about anything equivalent in MPICH... > > > > Thanks in advance for your help! > > > > Kind Regards > > > > Stephan -- Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger
