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Scalable parallel implementations of list ranking on fine-grained machines

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3 Author(s)
J. N. Patel ; Adv. Technol. Div., Oracle Corp., Redwood Shores, CA, USA ; A. A. Khokhar ; L. H. Jamieson

We present analytical and experimental results for fine-grained list ranking algorithms. We compare the scalability of two representative algorithms on random lists, then address the question of how the locality properties of image edge lists can be used to improve the performance of this highly data-dependent operation. Starting with Wyllie's algorithm and Anderson and Miller's randomized algorithm as bases, we use the spatial locality of edge links to derive scalable algorithms designed to exploit the characteristics of image edges. Tested on actual and synthetic edge data, this approach achieves significant speedup on the MasPar MP-1 and MP-2, compared to the standard list ranking algorithms. The modified algorithms exhibit good scalability and are robust across a wide variety of image types. We also show that load balancing on fine grained machines performs well only for large problem to machine size ratios

Published in:

IEEE Transactions on Parallel and Distributed Systems  (Volume:8 ,  Issue: 10 )