Download CS497_Lab2.zip to your cluster head node account. Unzip it.

You will make changes to the file **hello_mpi.c**.

Complete the program so that it computes the sum of all
integers from 1 to *n* in parallel, where *n* is an integer value
entered by the user. Each parallel process of the program
should use its rank to choose which range of integers
to sum.

Suggested approach:

- The process with rank 0 should read the integer value from the user and send it to all of the other processes, (All processes other than rank 0 should start by receiving the integer value from the process with rank 0.)
- Each process should sum the integers in a non-overalapping range,
based on its rank. (I.e., given
*p*processes, the process with rank 0 should sum the first*n*/*p*integers.) - Once the local sum has been computed, each process other than the one with rank 0 should send its local sum to the process with rank 0.
- The process with rank 0 should add its local sum to the local sums computed by the other nodes, and print the global sum.

Use the included **runpar** script to run the program.
It takes a single command line argument, the number of
parallel processes to create. E.g.:

./runpar 10

To run the program with 10 processes.