11f6643h3-key - 1, . .., lg p -1 The new time is t s lg p +...

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CS 6643 Parallel Processing Fall 2011 Homework 3 Solutions 10/4/11 4.2 Solved in the class. (b) Time taken = t s lg p + (p-1) m t w Step i takes t s + 2 i m t w , 0 <= i < lg p : Link between nodes 2 i -1 and 2 i is used by 2 i message. Improvement: Half the messages can use the wraparound link in steps
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Unformatted text preview: 1, . .., lg p -1 The new time is t s lg p + p/2 m t w 4.3 AAB on a ring (a) This was analyzed in the class. The run time is (p-1)(t s + m t w ) ....
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11f6643h3-key - 1, . .., lg p -1 The new time is t s lg p +...

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