Q: Consider three different processors P1, P2, and P3 that support the same instruction set. P1 has a 3 GHz clock rate and a CPI of 1.5. P2 has a 2.5 GHz clock rate and a CPI of 1.0. P3 has a 4.0 GHz clock rate and has a CPI of 2.2. (a) Which processor has the highest performance expressed in instructions per second? Show your calculations. (b) If the processors each execute a program in 10 seconds, find the number of cycles and the number of instructions for each processor. (c) We are trying to reduce the execution time by 30% (i.e., execution time is reduced from 10 seconds to 7 seconds). However, this leads to an increase of 20% in the CPI. For each processor, what clock rate should we have to get this time reduction? (Show the calculations you did to answer this question.)
Q: Consider three different processors P1, P2, and P3 that support the same instruction set. P1 has a 3 GHz clock rate and a CPI of 1.5. P2 has a 2.5 GHz clock rate and a CPI of 1.0. P3 has a 4.0 GHz clock rate and has a CPI of 2.2.
(a) Which processor has the highest performance expressed in instructions per second? Show your calculations.
(b) If the processors each execute a program in 10 seconds, find the number of cycles and the number of instructions for each processor.
(c) We are trying to reduce the execution time by 30% (i.e., execution time is reduced from 10 seconds to 7 seconds). However, this leads to an increase of 20% in the CPI. For each processor, what clock rate should we have to get this time reduction? (Show the calculations you did to answer this question.)
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