Neil Gunther extends Amdahl's law to the Universal Scalability Law in https://www.perfdynamics.com/Manifesto/USLscalability.pdf (pdf). He uses it to help model a system's scalibility.

Thanks for sharing both links. Seeing Amdahl’s original framing alongside Gustafson’s optimistic reinterpretation really helps clarify where the architectural limits start to dominate once workloads scale.

Nice write-up. I’ve always felt that Amdahl’s Law gets oversimplified in software discussions. The real bottlenecks tend to be architectural rather than purely parallelizable tasks.

an optimistic rebuttal to Amdahl's law: https://lawsofsoftwareengineering.com/laws/gustafsons-law/

the original 1967 paper: https://dl.acm.org/doi/epdf/10.1145/1465482.1465560