Consider three different processors, P1 P2 and P3, executing the same instruction set.

P1 has a 1.7 GHz clock rate and a CPI of 1.6

P2 has a 2.4 GHz clock rate and a CPI of 2.2

P3 has a 2.9 GHz clock rate and a CPI of 2.6.

QUESTION: (a). Which processor has the highest performance (please explain your answer). (b). If the processors each execute a program in 15 seconds, find the number of instructions and the number of cycles for each processor. (c). We are trying to reduce the current time of 15s by 30% but this leads to an increase of 25% in the CPI. For each processor, what clock rate should we have to achieve this time reduction?. (d). Using the results above, explain why it is inappropriate to compare the performance of each processor using the Clock Rate as a lone metric. What are the three key factors that affect performance?