Fetch And Add – switching network

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Presentation transcript:

Fetch And Add – switching network S = S + inc as executed by 8 processors inc 2 5 3 2 9 4 7 1 9 2 7 3 5 13 7 8 5 7 15 18 15 First Stage: Incrementing Memory S + 33 register S: memory

Fetch And Add – switching network S = S + inc S= 12 17 24 25 28 30 39 43 Inc= 2 5 3 2 9 4 7 1 39 10 12 17 24 25 28 30 9 2 7 3 25 30 10 17 5 7 10 25 15 Second Stage: Returning Value O (log P) S =10 Left: pass # up Right: # + register S = 10 + 33 S: memory