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README_cartesian.md

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Heat equation solver with Cartesian communicator

If you are not familiar with the two dimensional heat equation, please have a look for basic description in "Parallel programming with MPI" exercise material.

Here, starting point is a working code parallelized over columns (in Fortran) or rows (in C/C++).

The current version uses only MPI_COMM_WORLD, and neighboring process are determined manually.

  1. Add a "communicator" attribute to the basic parallelization data structure (type :: parallel_data in fortran/heat_mod.F90 or class ParallelData in cpp/heat.hpp)
  2. Create the Cartesian communicator in the routine parallel_setup() (Fortran) or in the the ParallelData() constructor (C++), and use MPI_Cart_shift for determining the neighboring processes
  3. Use the Cartesian communicator in all communication routines

To build the code, please use the provided Makefile (by typing make). By default, Intel compiler is used, in order to use gcc type make COMP=gnu.