Point-to-point

• Send/Receive

• Datatype

  • Basic for heterogeneity
  • Derived for non-contiguous

• Contexts

  • Message safety for libraries

• Buffering

  • Robustness and correctness

A(10)

B(20)

MPI_Send( A, 10, MPI_DOUBLE, 1, �)

MPI_Recv( B, 20, MPI_DOUBLE, 0, � )

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