Hello everybody, thanks for help. I'm having this problem using the package Rmpi. I run R with mpi and then I load the library 'Rmpi' and 'snow'. But when I try to create the cluster: mycluster <- makeCluster(2) I get this error Error in makeMPIcluster(spec, ...) : a cluster already exists 1 The first time I did this was ok, but I didn't link the created cluster to any object, to see if it worked I just tiped: makeCluster("name") So, now, I think I have this cluster. But since it has no name I cannot communicate with it. I can't even remove it or just link it to an object I can handle with. I checked all the documentations but I couldn't find anything useful. -- ___________________________________________________________ Sign-up for Ads Free at Mail.com http://promo.mail.com/adsfreejump.htm