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You have a program where 30% of its execution time is inherently sequential. The remaining 70% consists of 20 parallel threads. On a single core

You have a program where 30% of its execution time is inherently sequential. The remaining 70% consists of 20 parallel threads. On a single core processor it takes 100 seconds to run.

(i) What is the minimum time that it could take on a system with 8 cores? Explain and justify your answer.

(ii) Give 3 reasons why, in practice, you might not reach this theoretical speedup. Justify your answers.

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