Question: 1. Write a shared memory version and a message passing version of a program to find the sum of the elements of a large array

1. Write a shared memory version and a message passing version of a program to find the sum of the elements of a large array of integers (large as in tens of billions).

2. Why does our MSI protocol write back the block to memory on a BusRdX to an M block even though memory will continue to be stale due to the new writer?

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