if ( !is.loaded("mpi_initialize") ){
	library(Rmpi)
}

number_of_plots = 5
nodes = mpi.universe.size()-1
mpi.spawn.Rslaves(nslaves=nodes)

generate_plot <- function(filename){
	print(mpi.comm.rank())
	samples = rep(NA, 100000)
	for ( i in 1:100000 ){ samples[i] = mean(rexp(40, 0.2)) }
	
	jpeg(paste('plots/', filename, '.jpg', sep=""))
	
	hist(samples, main="", prob=T)
	lines(density(samples), col="darkblue", lwd=3)
	
	dev.off()
}

samples = 1:number_of_plots

mpi.applyLB(samples, generate_plot)

mpi.close.Rslaves()
mpi.quit()