Summary

In this section we have covered elements of Process Topologies which are the subject of Chapter 6 of ``MPI: A Message-Passing Interface Standard''. We have also covered some elements of Derived Data Types discussed in section 3.12. The new functions introduced in this lesson are:

• MPI_Cart_create creates a new communicator with a Cartesian process topology attached to it; discussed in section 7.6.1
• MPI_Cart_shift explores the neighbourhood of a given process in Cartesian topology; discussed in section 7.6.1
• MPI_Cart_coords converts process rank to Cartesian coordinates; discussed in section 7.6.1
• MPI_Cart_rank converts Cartesian coordinates to a process rank; discussed in section 7.6.1
• MPI_Sendrecv performs a simultaneous send a received operation; discussed in section 7.6.2
• MPI_Type_vector declares a not necessarily contiguous vector like structure characterised by a stride; discussed in section 7.6.3
• MPI_Type_commit asks MPI to optimise access operations for a newly defined MPI type; discussed in section 7.6.3