I'm trying to snow working with openmpi and sge. Everything appears to work, except, the program only runs on 2 node. If i tell snow to run on 9 nodes, it spawns 9 processes on a single node. I'm at a loss of ideas. Any help would be appreciated. Setup: Rocks Cluster, OpenMPI, R 2.8.0, Snow, Rmpi. Please ask for specifics. Thanks in advance.