Hi Leonardo
It depends on how many "slots" (a.k.a. CPUs/cores) you have per node.
You can add the flag "-bynode" to the mpiexec command line
to force it to run on different nodes.
"man mpiexec" is a helpful source of information about these things.
I hope this helps.
Gus Correa
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Gustavo Correa
Lamont-Doherty Earth Observatory - Columbia University
Palisades, NY, 10964-8000 - USA
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Leonardo Machado Moreira wrote:
Sorry If I misunderstood but, Should the mpirun -np4 hostname command
return all the machines no the openmpi-default-hostfile?
My host file has just two ips, the first is the server and the second a
node.
192.168.0.1
192.168.0.3
It just return the name of my server 4 times.
The same happens with other commands like "ls" or just "dir".
I didn't understood yet why does the mpi run the process 4 times or x
times. It must be just one but spreading it on the other machines. Must
not it??
On Tue, Jan 5, 2010 at 6:14 PM, Jeff Squyres <jsquy...@cisco.com
<mailto:jsquy...@cisco.com>> wrote:
You might want to try something simpler than java to start with.
For example:
mpirun -np 4 hostname
(where hostname is the POSIX command line app, not an MPI app)
You should see the hostnames from the first 4 hosts in your hostfile
(assuming each one of them has 1 process slot). Then try running
the samples that are in the examples/ directory in the Open MPI
tarball (make sure that the example executables are available in the
same location on every node). For example:
cd examples
make
mpirun -np 4 hello_c
That's a trivial C MPI application that is the MPI equivalent of
"hello world".
On Jan 5, 2010, at 11:18 AM, Leonardo Machado Moreira wrote:
> Hi, I have created a cluster with openmpi this way.
>
> 1 - Configured SSH with authorized_keys from the server to the nodes.
> 2 - In /etc/openmpi-default-hostfile\ I have typed the IP of
every nodes and the server.
> 3 - Afterward I have created a Java application of two threads
just to type a text on the console and runned it by
> mpirun -1 java javaprogram
> or
> mpirun -2 java javaprogram
> It is on the ps -aux of the server but the nodes are still stoped.
>
> How can I know that my mpi is working
>
> Thanks a lot
> _______________________________________________
> users mailing list
> us...@open-mpi.org <mailto:us...@open-mpi.org>
> http://www.open-mpi.org/mailman/listinfo.cgi/users
--
Jeff Squyres
jsquy...@cisco.com <mailto:jsquy...@cisco.com>
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