I have just installed OpenMPI on a Lenny cluster where SLURM works fine.
I can compile a sample C source of mine (I used LAM a few years ago),
but I can not run it on the cluster.
With LAM some configuration files must be set up, I guess it is the same here.
But as SLURM is also involved, it is not clear to me right now how I must
configure both SLURM and OpenMPI to make them work together. Any hint is welcome !