Computer Architecture Question: The computer spends 82% of the time computing an

Question

Computer Architecture Question:

The computer spends 82% of the time computing and 18% waiting for the disk. The instruction mix and the average cycles per instruction (CPI) for each type is:

Type / Instruction% / CPI

int / 40% / 1

FP / 30% /5

Other /30% /2

A) Consider 3 modifications to the computer. Compute the speedup for each. Then show which modification gave the best speedup?

i) The processor is replaced with a new one that reduces the total computation time by 35%

ii) The disk is replaced with a solid state device that reduces the disk waiting time by 85%

iii) The processor is replaced with a new one that has improved floating point performance. The average floating point CPI is reduced to 3; all other aspects are unchanged.

Explanation / Answer

Considering the threee modifications:

1) The processor is replaced with a new one reduces the total computation time by 35%

2) The disk is replaced with a solid state device that reduces the waiting time by 85%.

3) The average floating point CPI is reduced to 3.

Considering the three modifications the third one gives the best speed up. Because more number CPI is taken nder floating point but if the CPI for floating point is reduced the speed up will increase.

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