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Difference between revisions of "MPI Hello World"
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Now, to run your mpi program on the cluster, you will need to create a hostfile.
First, lets create a simple hostfile that just runs four processes on the local machine
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▲Put that line in a file called <tt>localhost </tt>.
Now run your program with that hostfile, using
mpirun --hostfile localhost ./hello_mpi
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and keep adding lines until you get to <tt> pnode40 slots=4 max_slots=8 </tt>.
The next step assumes you have set up your ssh keys as described in [[Cluster SSH Access]]
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