Make sure you're using the "right" mpirun. If you have both MPICH and
Open MPI installed, you need to install them into the different
directories.
As for not finding the "orted" on the remote nodes, it simply means
that your PATH / LD_LIBRARY_PATH is not set properly on the remote
nodes. See:
http://www.open-mpi.org/faq/?category=running#run-prereqs
http://www.open-mpi.org/faq/?category=running#adding-ompi-to-path
http://www.open-mpi.org/faq/?category=running#mpirun-prefix
A few notes about your command line syntax:
- "-np X" specifies how many processes to launch (where X is an
integer). If you don't specify this, OMPI defaults to as many slots
are defined in your hostfile.
mpirun -np 4 ....
- "--host LIST", where LIST is a comma-delimited list of hostnames to
launch on (*instead* of specifying a hostfile).
mpirun --host host1,host2,host3,host4 ....
- "--hostfile FILENAME", where FILENAME is a list of a hostfile as
described in the FAQ.
mpirun --hostfile my_hostfile.txt ...
You can't mix and match these params, like your example:
mpirun --host -np 2 node0,node1 /bin/hostname
On Apr 22, 2008, at 4:40 AM, gildo....@gmx.de wrote:
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
_______________________________________________
users mailing list
us...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/users
--
Jeff Squyres
Cisco Systems
