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You don't run lapack. lapack is a library that other applications use.

To use MPICH2, you need to start the mpd daemon on each machine to be used by your program. Make sure you have a file .mpd.conf in your home directory on each machine, with a line like

Code:

secretword=

with your favorite word following. You also need to have passwordless SSH from your machine to all the other machines you will be using.

The primitive way to launch the daemons is to simply type

Code:

mpd &

in a terminal window at each machine. It is more convenient to use mpdboot. To do this, first set up a file mpd.hosts in your home directory, with the names of the machines on which you want daemons to be running; list the network names of the machines, one line per machine, e.g. my mpd.hosts file

Code:

aragorn.clusterfsck.net

boromir.clusterfsck.net

samwise.clusterfsck.net

legolas.clusterfsck.net

gimli.clusterfsck.net

gandolf.clusterfsck.net

meriadoc.clusterfsck.net

pippin.clusterfsck.net

treebeard.clusterfsck.net

frodo.clusterfsck.net

faramir.clusterfsck.net

Then execute

Code:

mpdboot -n <number of machines to start> -f ~/mpd.hosts

To run your program called my_parallel_program

Code:

mpirun my_parallel_program

There are many good HOWTOs for MPICH2 on the internet, including the MPICH2 website. Feel free to use them for more detailed instructions.