I don’t have an MPI copy of 3.4 handy at the moment, but I’m pretty sure it does. It’s not the same MPI exactly as most of the executables. If I remember correctly, it requires you to precreate output directories (output_1, output_2, etc for N processors, or something similar). I forget the details. Give it a shot and tell me if there are errors. I’ll try to doublecheck on my copy of 3.4 once it finishes recompiling.