CODEWITHSUNDEEP
performancecpu-architecture
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Reputation: 4508

What is the total speedup?

This is not homework. I'm taking a computer architecture MOOC on my own time. There is a problem I can't figure out and maybe someone can help me. Here it is:

Memory operations currently take 30% of the execution time.

What is the total speedup?

Here is the formula that is used to calculate the speedup:

Speedup = 1 / [(1 - Non-speedup portion) + (Sped up portion 1)/speedup1 + (Sped up portion 2)/speedup2 + ...]

I calculated it as follows:

Speedup = 1 / [0.7 + 0.3*0.8/4 + 0.3*0.2*0.5/2 + 0.3*0.2*0.5] = 1.2422

But the answer is wrong which indicates that my reasoning is wrong, but I can't figure out where it is wrong. Can someone help me out?

Thanks.

Upvotes: 1

Views: 768

Answers (1)

flashburn
flashburn

Reputation: 4508

So as it turns out my fist answer was correct. As it happens the answer has to be with 2 digits after the decimal point. I.e it will consider 1.2422 as a wrong answer but 1.24 as a correct one. Sorry for the confusion everyone and thanks for the help.

Upvotes: 1

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