Consider three different processors P1, P2, and P3 executing the same instruction set. P1 has a 3.5 GHz clock rate and a CPI of 2.75. P2 has a 2.75 GHz clock rate and a CPI of 2.25. P3 has a 2.0 GHz clock rate and has a CPI of 1.75.
a) Which processor has the highest performance expressed in Instructions per second( P1, P2, or P3)?
b) If the processors each execute a program in 5 seconds, find the number of instructions that each processor performs in these 5 seconds.
For processor P1?
For processor P2?
For processor P3?
c) We are trying to decrease the execution time of P2 by 30% (70% of the original time) with a 20% increase in clock frequency. What must P2’s CPI become to get this 30% increase with a 20% increase in frequency?