In reply to Kathleen McCandless.

I'd say that this sounds like the exact case that we created the MPI Java bindings for. Give it a whirl with the Java bindings and send us your feedback -- let us know what's good and what's bad.

Oscar Gisbert has been pushing in some further performance improvements after 1.7.4 was released, too -- they'll all be included in 1.7.5, which should be out sometime soon (!) (we had lots of new stuff queued up while 1.7.4 was undergoing its release process, so 1.7.5 isn't far behind).