cs140-complexity

cs140-complexity - Complexity Measures for Parallel...

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Complexity Measures for Parallel Computation
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Several possible models! Several possible models! Execution time and parallelism: Work / Span Model Total cost of moving data: Communication Volume Model Detailed models that try to capture time for moving data: Latency / Bandwidth Model (for message-passing) Cache Memory Model (for hierarchical memory)
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t p = execution time on p processors Work / Span Model Work / Span Model
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t p = execution time on p processors t 1 = work Work / Span Model Work / Span Model
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t p = execution time on p processors *Also called critical-path length or computational depth . t 1 = work t = span * Work / Span Model Work / Span Model
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t p = execution time on p processors t 1 = work t = span * *Also called critical-path length or computational depth . W ORK L AW t p ≥t 1 /p S PAN L AW t p ≥ t Work / Span Model Work / Span Model
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Work: t 1 (A∪B) = Series Composition Series Composition A B (A∪B) = t 1 (A) + t 1 (B) Span: t (A∪B) = t (A) +t (B) (A∪B) =
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This document was uploaded on 02/22/2011.

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cs140-complexity - Complexity Measures for Parallel...

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