PLease Explain? You have an important program to execute and you want to minimiz

Question

PLease Explain?

You have an important program to execute and you want to minimize its run time. You have a choice between two 800 MHz processors i.e. both processors have a cycle time of 1.25 ns. Here are the other specs for the processor and it's compiler, on your application: Option A: This option has a processor with a CPI of 0.5 and a compiler requiring your program to execute 1 million instructions. Option B: This option has a processor with a CPI of 0.6 and a compiler requiring your program to execute 750 thousand instructions. Which of these two options do you select and why?

Explanation / Answer

execution time = Instruction count * CPI * cycle time

so for A exec time = 10^6 * 0.5 = 5,00,000

for B exec.time = 0.6 * 750000 = 4,50,000

execution time of B < exec.time of aA

choose B

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