Amdahl's Law - Relation To Gustafson's Law

Relation To Gustafson's Law

John L. Gustafson pointed out in 1988 what is now known as Gustafson's Law: people typically are not interested in solving a fixed problem in the shortest possible period of time, as Amdahl's Law describes, but rather in solving the largest possible problem (e.g., the most accurate possible approximation) in a fixed "reasonable" amount of time. If the non-parallelizable portion of the problem is fixed, or grows very slowly with problem size (e.g., O(log n)), then additional processors can increase the possible problem size without limit.

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