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2010
IEEE

Executing task graphs using work-stealing

8 years 10 months ago
Executing task graphs using work-stealing
Abstract--NABBIT is a work-stealing library for execution of task graphs with arbitrary dependencies which is implemented as a library for the multithreaded programming language Cilk++. We prove that NABBIT executes static task graphs in parallel in time which is asymptotically optimal for graphs whose nodes have constant in-degree and out-degree. To evaluate the performance of NABBIT, we implemented a dynamic program representing the Smith-Waterman algorithm, an irregular dynamic program on a two-dimensional grid. Our experiments indicate that when task-graph nodes are mapped to reasonably sized blocks, NABBIT exhibits low overhead and scales as well as or better than other scheduling strategies. The NABBIT implementation that solves the dynamic program using a task graph even manages in some cases to outperform a divide-and-conquer implementation for directly solving the same dynamic program. Finally, we extend both the NABBIT implementation and the completion-time bounds to handle d...
Kunal Agrawal, Charles E. Leiserson, Jim Sukha
Added 13 Feb 2011
Updated 13 Feb 2011
Type Journal
Year 2010
Where IPPS
Authors Kunal Agrawal, Charles E. Leiserson, Jim Sukha
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