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A Brief Word on MPI-2 and MPI-3


Intentionally, the MPI-1 specification did not address several “difficult” issues. For reasons of expediency, these issues were deferred to a second specification, called MPI-2 in 1998. MPI-2 was a major revision to MPI-1 adding new functionality and corrections.

Key areas of new functionality in MPI-2:


The MPI-3 standard was adopted in 2012, and contains significant extensions to MPI-1 and MPI-2 functionality including:

More Information on MPI-2 and MPI-3:

MPI Standard documents: