Frequently Asked Questions
What does Amdahl's Law actually predict?
It predicts the maximum speedup for a fixed-size task when you add processors. The serial portion that cannot be parallelized sets a hard ceiling on speedup no matter how many processors you add.
Why does a small serial fraction limit speedup so much?
If even ten percent of a task runs serially, the best possible speedup is ten times, because that serial slice never gets faster. This is why reducing the serial fraction often matters more than adding hardware.
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