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Pipeline Efficiency

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A pipeline has a speedup factor of 5 and operating at 70% efficiency. How many stages are there in the pipeline?

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In Pipeline with K stages,

Efficiency (ɳ)=speed up (S) /# stages(K)
So, K= S/ɳ
S=5/.7
K=ceil(7.14) =8 Stages
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Efficiency is speedup/number of processors

here we can find number of processors by dividing speedup by efficiency

5/0.7 = 8 take the ceil value
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