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Subject: Re: [OMPI users] How to test it
From: Leonardo Machado Moreira (lm.moreira_at_[hidden])
Date: 2010-01-05 17:18:15


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 <jsquyres_at_[hidden]> 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
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>
> --
> Jeff Squyres
> jsquyres_at_[hidden]
>
>
> _______________________________________________
> users mailing list
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> http://www.open-mpi.org/mailman/listinfo.cgi/users
>