5. Amdahl's Law For an important application, an old processor spends 30% of its time on...

 

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5. Amdahl's Law For an important application, an old processor spends 30% of its time on executing J-type instructions, 40% of the time on executing R-type instructions, and 30% of the time on executing I-type instructions. a) [10 points] An engineer claims it is possible to redesign the processor to achieve 2X speedup simply by speeding up one (and just one) type of instructions alone. Do you agree with the claim? Justify your answer. b) [10 points] A company wants to achieve a speedup of 100/65-1.54 simply by making one (and just one) type of instructions fasters. Which type of instruction does it have to be? Justify your answer c) [10 points] In the new processor, the type of instruction in b) must be N times as fast as in the old processor to achieve an overall speedup of 100/65. What is N? [Clarify: 1 time as fast means equally fast. N can be a fraction]. 5. Amdahl's Law For an important application, an old processor spends 30% of its time on executing J-type instructions, 40% of the time on executing R-type instructions, and 30% of the time on executing I-type instructions. a) [10 points] An engineer claims it is possible to redesign the processor to achieve 2X speedup simply by speeding up one (and just one) type of instructions alone. Do you agree with the claim? Justify your answer. b) [10 points] A company wants to achieve a speedup of 100/65-1.54 simply by making one (and just one) type of instructions fasters. Which type of instruction does it have to be? Justify your answer c) [10 points] In the new processor, the type of instruction in b) must be N times as fast as in the old processor to achieve an overall speedup of 100/65. What is N? [Clarify: 1 time as fast means equally fast. N can be a fraction].