The easiest way of installing MPI on Ubuntu is by ‘sudo apt-get install mpich’.
As long as these two machines can ssh to each other, MPI can be used to connect them.
To use multiple machines, you need to create a machine file like:
        //machinefile:
        hostnameA
        hostnameB
Then if you run MPI using ‘mpiexec -f machinefile -n 2 ./example/cpi’, the application ‘cpi’ will run on both machines and communication through MPI.

For more details, please refer to https://www.mpich.org/static/downloads/3.1/mpich-3.1-userguide.pdf for more information.

—
Huiwei Lu
Postdoc Appointee
Mathematics and Computer Science Division, Argonne National Laboratory
http://www.mcs.anl.gov/~huiweilu/

On Apr 24, 2014, at 7:39 AM, ehsan saei <ehsan.saei@gmail.com> wrote:

> Dear community,
>
> I have to PCs with ubuntu 12.04 installed on them. How can I use MPI on these machines?
> Is it possible to connect them without router?
> It would be grateful if you guide me.
>
> Thanks in advance,
> Ehsan

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