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1. In MPI, what is purpose of organizing cores into groups? 2. Generally, taking execution times of cores allows overall system-wide performance analysis. How does

1. In MPI, what is purpose of organizing cores into groups?

2. Generally, taking execution times of cores allows overall system-wide performance analysis. How does MPI_Wtime() work or could be used in an MPI code to achieve this time-based task?

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