(Solution) 18- When Parallelizing An Application, The Ideal Speedup Is Speeding Up By The Number Of Processors. This Is Limited By Two Things: | Snapessays.com


(Solution) 18- When parallelizing an application, the ideal speedup is speeding up by the number of processors. This is limited by two things:


1.18- When parallelizing an application, the ideal speedup is speeding up by the number of processors. This is limited by two things: percentage of the application that can be parallelized and the cost of communication. Amdahl’s law takes into account the former but not the latter.

 

a) What is the speedup with N processors if 80% of the application is parallelizable, ignoring the cost of communication?

 

 

b) What is the speedup with 8 processors if, for every processor added, the communication overhead is 0.5% of the original execution time.

 

 

 

c) What is the speedup with 8 processors if, for every time the number of processors is doubled, the communication overhead is increased by 0.5% of the original execution time?

 

 

d) What is the speedup with N processors if, for every time the number of processors is doubled, the communication overhead is increased by 0.5% of the original execution time?

 

 

 

e) Write the general equation that solves this question: What is the number of processors with the highest speedup in an application in which P% of the original execution time is parallelizable, and, for every time the number of processors is doubled, the communication is increased by 0.5% of the original execution time?

 

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This question was answered on: May 23, 2022

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