Regular Grid Example:Getting the Decomposition

int size, dims[2], periods[2];

MPI_Comm_size( MPI_COMM_WORLD, &size );
MPI_Dims_create( size, 2, dims );
periods[0] = periods[1] = 0;
MPI_Cart_create( MPI_COMM_WORLD, 2, dims,
periods, 1, &comm2d );

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