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In this case, Gustafson's law gives a less pessimistic and more realistic assessment of the parallel performance. [10] Universal Scalability Law (USL), developed by Neil J. Gunther, extends the Amdahl's law and accounts for the additional overhead due to inter-process communication. USL quantifies scalability based on parameters such as ...
Gustafson's law addresses the shortcomings of Amdahl's law, which is based on the assumption of a fixed problem size, that is of an execution workload that does not change with respect to the improvement of the resources. Gustafson's law instead proposes that programmers tend to increase the size of problems to fully exploit the computing power ...
Amdahl's law is used to find out the maximum expected improvement to an overall system when only a part of it is improved. Named after Gene Amdahl (1922–2015). Ampère's circuital law , in physics, relates the circulating magnetic field in a closed loop to the electric current through the loop.
Gene Myron Amdahl (November 16, 1922 – November 10, 2015) was an American computer architect and high-tech entrepreneur, chiefly known for his work on mainframe computers at IBM and later his own companies, especially Amdahl Corporation. He formulated Amdahl's law, which states a fundamental limitation of parallel computing.
Also, IMO Gustafson's law does not contradict Amdahl's law: it's merely a different approach to parallelism, but both are valid. As explained in the last paragraph of Gustafson's paper, Gustafson's point has to be replaced in the context of a misuse of Amdahl's law causing overrated skepticism over the practical value of massive parallelism ...
Substantive due process is a principle in United States constitutional law that allows courts to establish and protect substantive laws and certain fundamental rights from government interference, even if they are unenumerated elsewhere in the U.S. Constitution.
All three speedup models, Sun–Ni, Gustafson, and Amdahl, provide a metric to analyze speedup for parallel computing. Amdahl’s law focuses on the time reduction for a given fixed-size problem. Amdahl’s law states that the sequential portion of the problem (algorithm) limits the total speedup that can be achieved as system resources increase.
As you say, assuming that the problem size does not vary with processing resources is a limitation of Amdahl’s law, and why Gustafson’s law was formulated. As an encyclopedia, it’s important for us to describe Amdahl’s law as it is ordinarily defined, rather than to try to improve it. Sneftel 11:27, 21 September 2024 (UTC)