EBK COMPUTER SYSTEMS
EBK COMPUTER SYSTEMS
3rd Edition
ISBN: 8220101459107
Author: O'HALLARON
Publisher: YUZU
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Chapter 1.9, Problem 1.2PP
Program Plan Intro

Amdahl’s Law:

  • It denotes an observation on effectiveness of performance improving of a system part.
  • The main idea is that when one system part is been speed up the effect on overall system would depend on significance and speed up of the part.
  • Suppose the execution of an application needs “Told” time.
  • Some part of system may require a fraction “α” of this time and the performance is improved by a factor of “k”.
  • The overall execution time will be “Tnew=Told[(1-α)+α/k] ”.
  • The speed up can be computed as “S=Told/Tnew”.
  • Hence, the expression for speed up is “S=1/(1-α)+α/k”.

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