Cannot run MPI job across nodes using OpenMPI in F17

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http://forums.fedoraforum.org – I am new in Linux and clustering. I am setting up a Beowulf Cluster using several PCs according to this guide http://www.tldp.org/HOWTO/html_single/Beowulf-HOWTO/. I have setup and configure accordingly except for NFS part. Because I am not requiring it for my application. I have set my ssh to login each other without password. I started with 2 nodes 1st. I can compile and run in my headnode using openmpi. But when I try to run my MPI application across nodes, there is nothing displaying. It just like hanging there. Headnode: master client: slave4 The command I used to mpirun across (HowTos)