Printing from mclapply in R Studio

Question

I am using mclapply from within RStudio and would like to have an output to the console from each process but this seems to be suppressed somehow (as mentioned for example here:

Answer 1

Just expanding a little on the solution used by the asker, i.e. writing to a file to check progress:

write.file = '/temp_output/R_progress'

time1 = proc.time()[3]
outstuff = unlist(mclapply(1:1000000, function(i){
  if (i %% 1000 == 0 ){
    file.create(write.file)
    fileConn<-file(write.file)
    writeLines(paste0(i,'/',nrow(loc),' ',(i/nrow(loc)*100)), fileConn)
    close(fileConn)
  }
  #do your stuff here
}, mc.cores=6))
print(proc.time()[3] - time1)

And then you can monitor from a console with

tail -c +0 -f '/temp_output/R_progress'