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/usr/lib/R/site-library/snow/RMPISNOWprofile is in r-cran-snow 1:0.3.9-1.

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The actual contents of the file can be viewed below.

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library(Rmpi)
library(snow)

.MPIrun <- function() 
{
    if (mpi.comm.rank(0) > 0){
        sys.load.image(".RData",TRUE)
        .First.sys()
	sink(file="/dev/null")
        slaveLoop(makeMPImaster())
        mpi.quit()
    }
    else {
        makeMPIcluster()
        .Last <<- function(){
            cl <- getMPIcluster()
            if (! is.null(cl))
                stopCluster(cl)
            mpi.quit()
        }
    }
}

.MPIrun()