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Computing Speedup & Efficiency

If I have 100 processors for a computation with 5% of the code cannot be parallelized, how do I compute the speedup and efficiency?

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<br>Speedup is defined as the time it takes a program to execute in serial (with one processor) divided by the time it takes to execute in parallel (with many processors).
<br>The formula for speedup is:
<br><br> S = ...

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