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4. (30 points) Consider using four processors to add 1024 numbers and the result is kept in a variable sum. We assume the data is evenly split among the four processors. What is the performance predicted by CTA model (non-local access time is 1) in the following two scenarios: 1) the sum variable is allocated to one processor's memory; 2) each thread keeps a local copy of the sum. 4. (30 points) Consider using four processors to add 1024 numbers and the result is kept in a variable sum. We assume the data is evenly split among the four processors. What is the performance predicted by CTA model (non-local access time is 1) in the following two scenarios: 1) the sum variable is allocated to one processor's memory; 2) each thread keeps a local copy of the sum