MPI CART CREATE While having the processes laid out in the Cartesian topology help you write code that's conceivably more readable, many MPl routines recognize only rank number and hence knowing the relationship between ranks and Cartesian coordinates (as shown in the figures above)is the key to exploit the topology for computational advantages. In the following sections, we will discuss two subroutines that provide this information. They are MPI CART COORDS MPI CART RANKMPI_CART_CREATE • While having the processes laid out in the Cartesian topology help you write code that's conceivably more readable, many MPI routines recognize only rank number and hence knowing the relationship between ranks and Cartesian coordinates (as shown in the figures above) is the key to exploit the topology for computational advantages. In the following sections, we will discuss two subroutines that provide this information. They are – MPI_CART_COORDS – MPI_CART_RANK