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The universal scalability law (USL) is an analytic model used to quantifyapplication scaling. It is universal because it subsumes Amdahl's law andGustafson linearized scaling as special cases. Using simulation, we show: (i)that the USL is equivalent to synchronous queueing in a load-dependent machinerepairman model and (ii) how USL, Amdahl's law, and Gustafson scaling can beregarded as boundaries defining three scalability zones. Typical throughputmeasurements lie across all three zones. Simulation scenarios provide deeperinsight into queueing effects and thus provide a clearer indication of whichapplication features should be tuned to get into the optimal performance zone.

Getting in the Zone for Successful Scalability