Universal Scalability Law: The Physics of Scaling
The Universal Scalability Law (USL) models throughput by quantifying the two costs of parallelism: contention and coherency. Use it to forecast performance and diagnose bottlenecks.
The Universal Scalability Law (USL) is a model that predicts system throughput by quantifying the two main costs of parallelism: contention (resource sharing) and coherency (data consistency). It's used to forecast performance at unmeasured load levels and diagnose whether a bottleneck is caused by contention or coherency overhead. The biggest mistake is treating the USL as just a curve-fitting exercise; its parameters represent real, physical overheads in your system's architecture.
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