The Message Passing Interface (MPI) is a computer communications protocol. It is a de facto standard for communication among the nodes running a parallel program on a distributed memory system . MPI is a library of routines that can be called from Fortran, C and C++ programs. MPI's advantage over older message passing libraries is that it is both portable (because MPI has been implemented for almost every distributed memory architecture) and fast (because each implementation is optimized for the hardware it runs on).
The most common implementation in use is MPICH. Also available is LAM-MPI.
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