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/usr/lib/R/site-library/snow/RMPInode.R is in r-cran-snow 1:0.4.2-1.1.

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local({
    snowlib <- Sys.getenv("R_SNOW_LIB")
    outfile <- Sys.getenv("R_SNOW_OUTFILE")

    args <- commandArgs()
    pos <- match("--args", args)
    args <- args[-(1 : pos)]
    for (a in args) {
        pos <- regexpr("=", a)
        name <- substr(a, 1, pos - 1)
        value <- substr(a,pos + 1, nchar(a))
        switch(name,
               SNOWLIB = snowlib <- value,
               OUT = outfile <- value)
    }

    if (! (snowlib %in% .libPaths()))
        .libPaths(c(snowlib, .libPaths()))
    library(methods) ## because Rscript as of R 2.7.0 doesn't load methods
    library(Rmpi)
    library(snow)

    sinkWorkerOutput(outfile)
    cat("starting MPI worker\n")
    runMPIslave()
})