fa96-quiz2 - 1 CS 252 Quiz 2 Name:________________________...

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Unformatted text preview: 1 CS 252 Quiz 2 Name:________________________ Place your name on all of the pages containing questions. There should be a total of 8 pages in this exam, including the figure at the end. Note: For this exam, 1 MB = 2 20 bytes . 1. Double your Pleasure a) Give one reason why speedup is not a good way to measure the performance of a multiproces- sor. b) Give a situation where a program is mor e than twice as fast when you double the number of processors in a multiprocessor. 1. Double your Pleasure 2. Queueing the Network 3. RAIDers and RAINers 4. Cleaning up the States Total 2 CS 252 Quiz 2 Name:________________________ 1. Double your Pleasure (contd) c) What is the fourth C for multiprocessors? How does the fourth C change as you increase block size in a shared memory multiprocessor? Why? d) Suppose a parallel machine with 100 processors can function in just two modes: parallel (in which all processors are used) and serial (in which only one processor at a time is doing useful work). What is the maximum percentage of time that a parallel application can spend in serial mode for a speedup of 80 compared to the sequential version? 3 CS 252 Quiz 2...
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fa96-quiz2 - 1 CS 252 Quiz 2 Name:________________________...

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