Question: Q4 A SPEC benchmark program has 1 billion total instructions. The reference time is 4 secs. The program consists of 4 classes of instructions A.B,C,D

Q4 A SPEC benchmark program has 1 billion total instructions. The

Q4 A SPEC benchmark program has 1 billion total instructions. The reference time is 4 secs. The program consists of 4 classes of instructions A.B,C,D in the ratio 4:3:2:1. The CPI for the classes are 3, 2, 2, 1 respectively. The clock rate of the CPU under test is 2 GHz (i) what is the SPEC ratio? (i) What should be the clock rate to obtain a SPEC ratio of 5? (iii) What will be the SPEC ratio if a compiler optimization reduces the number of class A instructions by 20% and the number of class B instructions by 10% keeping the clock rate unchanged at 2 GHz

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