R Snow show all created clusters

Question

I'm doing some stuff that uses snow clusters. Currently the only way I know of to see how many active clusters there are is to open the task manager -> resource manager -> sort by name and look for RScript objects. Is there a way to do this in R?

Also the reason I ask this is so I can delete the previously created clusters. Sometimes I'll see RScript objects still around after running stopCluster() in R. Any suggestions would be appreciated.

Note: So far all the clusters I've done are localhost/SOCK clusters to use 2nd core on my laptop.

Answer 1

You must create a cluster object, frequently called cl, which you can inspect.

From the help page:

## Two workers run on the local machine as a SOCK cluster.
cl <- makeCluster(c("localhost","localhost"), type = "SOCK")
clusterApply(cl, 1:2, get("+"), 3)
stopCluster(cl)

That cl object will tell you about hosts.