A program has 1024 instructions and runs on a 20 GHz process

A program has 1024 instructions, and runs on a 2.0 GHz processor in 20 seconds. What is its CPI?

Solution

Answer:

We have given I = 1024 , CR = 2.0Hz , execution time = 20 seconds

We know that , execution time = CPI * I * 1/CR

execution time x CR = CPI x I

=> CPI = execution time x CR / I = 20 x 2/1024 = 0.0390625