Merits of MPI

• Runs on any shared or distributed memory architectures;
• Can be used on a wider range of troubles than OpenMP;
• Every process has its own local variables; and
• Distributed memory computers are not costly rather than large shared memory computers.

Drawback of MPI

• Needs more programming changes to go from serial to parallel version.
• Can be harder to debug, and
• Performance is partial by the communication network among the nodes.