More cores, limited speedup
Find the part of a job more cores cannot speed up.
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When does total speedup equal the worker count?
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How it works & assumptions
Amdahl’s law: Tₙ=100[s+(1−s)/n] and speedup=1/[s+(1−s)/n]. Serial work finishes before evenly divided parallel work.
Fixed total work, ideal identical workers, no communication or scheduling overhead. 100 normalized time units on one worker.
References: Cornell Virtual Workshop: Amdahl's Law
This is an ideal mathematical model, not a measurement or a forecast.