By Topic

Topology-aware task mapping for reducing communication contention on large parallel machines

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Agarwal, T. ; Univ. of Illinois at Urbana-Champaign, IL, USA ; Sharma, A. ; Kale, L.V.

Communication latencies constitute a significant factor in the performance of parallel applications. With techniques such as wormhole routing, the variation in no-load latencies became insignificant, i.e., the no-load latencies for far-away processors were not significantly higher (and too small to matter) than those for nearby processors. Contention in the network is then left as the major factor affecting latencies. With networks such as fat-trees of hypercubes, with number of wires growing as P log P, even this is not a very significant factor. However, for torus and grid networks now being used in large machines such as BlueGene/L and the Cray XT3, such contention becomes an issue. We quantify the effect of this contention with benchmarks that vary the number of hops traveled by each communicated byte. We then demonstrate a process mapping strategy that minimizes the impact of topology by heuristically minimizing the total number of hop-bytes communicated. This strategy, and its variants, are implemented in an adaptive runtime system in Charm++ and adaptive MPI, so it is available for a broad class of applications.

Published in:

Parallel and Distributed Processing Symposium, 2006. IPDPS 2006. 20th International

Date of Conference:

25-29 April 2006