Rename MPI command for compatibility.
Rename MPI command for compatibility.

atlarge-research/graphalytics-platforms-graphmat,atlarge-research/graphalytics-platforms-graphmat,atlarge-research/graphalytics-platforms-graphmat,tudelft-atlarge/graphalytics-platforms-graphmat,tudelft-atlarge/graphalytics-platforms-graphmat,tudelft-atlarge/graphalytics-platforms-graphmat