Parallel processing in R limited

Question

I\'m running ubuntu 12.04 and R 2.15.1 with the parallel and doParallel packages. when I run anything in parallel I\'m limited to 100% of a core, when I should have up to 80

Answer 1

My guess is that you probably had the wrong code. I would like to post one example copied from online http://www.r-bloggers.com/parallel-r-loops-for-windows-and-linux/ :

library(doMC)
registerDoMC()
x<- iris[which(iris[,5]!='setosa'),c(1,5)]
trials<- 10000
r<- foreach(icount(trials), .combine=cbind) %dopar% {
    ind<- sample(100,100,replace=T)
    result1<- glm(x[ind,2]~x[ind,1],family=binomial(logit))
    coefficients(result1)
}

and you can define how many cores you want to use in the parallel:

options(cores=4)