rforeachparallel-processingdomc

How to kill a doMC worker when it's done?

The documentation for doMC seems very sparse, listing only doMC-package and registerDoMC(). The problem I'm encountering is I'll spawn several workers via doMC/foreach, but then when the job is done they just sit there taking up memory. I can go and hunt their process IDs, but I often kill the master process by accident. 

library(doMC)
library(foreach)

registerDoMC(32)

foreach(i=1:32) %dopar% foo()

##kill command here?

I've tried following with registerDoSEQ() but it doesn't seem to kill off the processes.

Solution

  • I never did find a suitable solution for doMC, so for a while I've been doing the following:

    library(doParallel)
cl <- makePSOCKcluster(4) # number of cores to use
registerDoParallel(cl)

## computation

stopCluster(cl)

    Works every time.