mpirun -np NCPUS ./gs2 runname
To execute on the O2K's at acl.lanl.gov:
bsub -I -n 10 -R "span[ptile=10]" mpirun ./gs2 runname
where the -R "span[ptile=10]" command insures that all 10 processors are in the same machine (to avoid hippi communication).