Exercise 9

Exercise 9

Each process initializes a one-dimensional array by giving to all the elements the value of its rank+1. Then the root process (task 0) performs two reduce operations (sum and then product) to the arrays of all the processes. Finally, each process generates a random number and root process finds (and prints) the maximum value among these random values.

Modify the code to perform a simple scalability test using MPI_Wtime. Notice what happens when you go up with the number of processes involved.