Two processors P1 and P2execute the same instruction set. Assume four classes of

Question

Two processors P1 and P2execute the same instruction set. Assume four classes ofinstruction (A, B, C, and D). Following table has the clockrate and CPI for each processor. Processor Clock rate CPI Class A CPI Class B CPI Class C CPI Class D P1 1.5 GHz 1 2 3 4 P2 2 GHz 2 2 2 2

1. suppose there is aprogram with 10^6 instructions divided into 10% class A, 20% B, 50%C and 20% D, which processor has higher performance?
2. What is the global CPIfor each processor?
3. How many total clockcycles will each processor spend on running theprogram?

Processor Clock rate CPI Class A CPI Class B CPI Class C CPI Class D P1 1.5 GHz 1 2 3 4 P2 2 GHz 2 2 2 2 Processor Clock rate CPI Class A CPI Class B CPI Class C CPI Class D P1 1.5 GHz 1 2 3 4 P2 2 GHz 2 2 2 2

Explanation / Answer

           CPUTime = (IC * CPI) / clock rate

Processor P1

           CPUtime for A = (100000 * 1) / (1.5*10^9) = 6.67 *10^-5

           CPUtime for B = (200000 * 2) / (1.5*10^9) = 1.33 *10^-4

           CPUtime for C = (500000 * 3) / (1.5*10^9) = 0.001

           CPUtime for D = (200000 * 4) / (1.5*10^9) = 5.33 *10^-4

Processor P2

            CPUtime for A = (100000 * 2) / (2*10^9) = 1*10^-4

           CPU time for B = (200000 * 2) / (2*10^9) = 2*10^-4

           CPU time for C = (500000 * 2) / (2*10^9) = 5*10^-4

           CPU time for D = (200000 * 2) / (2*10^9) = 2*10^-4

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