Question

2. A certain program has the following instruction classes, CPIs, and mixtures: Instruction Type CPI ratio 1.5 .40 2.1 .35 3 a. What is the average CPI for this processor? b. You have the following options: • Option 1: Reduce the CPI of instruction type B to 1.8 • Option 2: Reduce the CPI of instruction type C to 2.5 Which option would you choose and why? 3. Consider three different processors P1, P2, and P3 executing the same instruction set. P1 has a 450 MHz Clock rate and a CPI of 1.75 P2 has a 227 MHz Clock rate and a CPI of 2.0 P3 has a 2.3 GHz Clock rate and a CPI of 5.0 If the processors each execute a benchmark program in 750 milliseconds, find the number of clock cycles and the number of instructions for each processor to execute the benchmark program.

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Answer 1

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(2) a) average CPI = { CPI; x ratio: = 1.5 X 0.40 + 2.1 x 0.35 + 3 X0:25 = 2.085

Q2) b) obtion 1: arg. CPI = 1.5 x 0.40 + 1.8 x 0.35 + 3x0.25 = 0.6 + 0.63 + 0.75 = 1.98 option: 2 aug. CPI = 1.5 x 0.40 + 2.1 x0.35 + 215x0.25 = 0.6 + 0.735 + 0.625 = 1.96 We would choose option & lower is cru time which better CPU performance. as lower is CPI turn leads to in

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