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Running MPI jobs with R, particularly R-snow, requires some special handling. If the MPI processes will all be on a single host then you can essentially start R as normal and spawn MPI slave ranksMPI ranks. However, if running across multiple nodes, the processes must be spawned by mpirun. This could also be done for the single node case. Since this will have R started by mpirun we need to use a wrapper that will distinguish between the master primary and slave secondary processes and start up the respective R sessions accordingly. This wrapper is called RMPISNOW. The launch command would look something like the following in an SGE job script.
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