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chenh1

Because we assume perf(1) = 1 here, what the relationship between perf(r) and perf(1), linear or any other?

kayvonf

perf(r) is just a function that returns the single-threaded throughput of a processor that built r units of hardware. On the next slide we modeled perf(r) as sqrt(r) so more resources doesn't result in linearly proportional increases in single threaded performance.

kayvonf

This section of the lecture was taken from "Amdahl's Law in the Multi-Core Era", by Hill and Marty, IEEE Computer 2008.

http://research.cs.wisc.edu/multifacet/papers/ieeecomputer08_amdahl_multicore.pdf