"James D. Freels" <freelsjd@ornl.gov> writes: > mpirun trivialf > mpirun: cannot parse: Exec format error OK this is really a shot in the dark but, did you compile the code on both architectures? Maybe it's trying to run the i386 code on the alpha, or vice-versa? Othernat, try the MPI/LAM newsgroup/mailing-list/whatever.. BTW, is that all Beowulf clusters are? Boxes running MPI connected via a fast network? -chris