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Dynamic Load Balancing of Unbalanced Computations Using Message Passing

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6 Author(s)
Dinan, J. ; Dept. of Comput. & Inf. Sci., Ohio State Univ., Columbus, OH ; Olivier, S. ; Sabin, G. ; Prins, J.
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This paper examines MPI's ability to support continuous, dynamic load balancing for unbalanced parallel applications. We use an unbalanced tree search benchmark (UTS) to compare two approaches, 1) work sharing using a centralized work queue, and 2) work stealing using explicit polling to handle steal requests. Experiments indicate that in addition to a parameter defining the granularity of load balancing, message-passing paradigms require additional parameters such as polling intervals to manage runtime overhead. Using these additional parameters, we observed an improvement of up to 2times in parallel performance. Overall we found that while work sharing may achieve better peak performance on certain workloads, work stealing achieves comparable if not better performance across a wider range of chunk sizes and workloads.

Published in:

Parallel and Distributed Processing Symposium, 2007. IPDPS 2007. IEEE International

Date of Conference:

26-30 March 2007

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