README.md

mcprogress

Adds a progress bar to mclapply() using echo to output to the console in Rstudio or Linux environments. Simply replace your original call to mclapply() with pmclapply().

A progress bar can also be displayed with parallelisation via the foreach package.

Also included are functions to safely print messages (including error messages) from within parallelised code. This can be very useful for debugging parallelised R code.

Installation

Install direct from Github.

devtools::install_github("myles-lewis/mcprogress")

Example

# toy example
res <- pmclapply(letters[1:20], function(i) {
                 Sys.sleep(0.2 + runif(1) * 0.1)
                 setNames(rnorm(5), paste0(i, 1:5))
                 }, mc.cores = 2, title = "Working")

Working / |================================                 |  60%  eta 3.1 secs

Another example using the foreach package with doMC backend.

# Example from doMC vignette
library(doMC)
library(foreach)
registerDoMC(4)

x <- iris[which(iris[,5] != "setosa"), c(1,5)]
trials <- 10000

{
  start <- Sys.time()
  r <- foreach(i = seq_len(trials), .combine = cbind) %dopar% {
    ind <- sample(100, 100, replace = TRUE)
    result1 <- glm(x[ind, 2] ~ x[ind, 1], family = binomial(logit))
    mcProgressBar(i, trials, cores = getDoParWorkers(), start = start)
    coefficients(result1)
  }
  closeProgress(start)
}