SCHEDULE: NOV 12-18, 2011

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Optimizing All-to-All Algorithm for Blue Waters Using Simulation

SESSION: ACM Student Research Competition Poster Session

EVENT TYPE: ACM Student Research Competition Poster

TIME: 5:15PM - 7:00PM

SESSION CHAIR: Bernd Mohr

AUTHOR(S):Ehsan Totoni

ROOM:WSCC North Galleria 2nd/3rd Floors

ABSTRACT:
Communication algorithms play a crucial role in the performance of large-scale parallel systems. As vendors are willing to design new custom networks with significantly different performance properties for their new supercomputers, designing new efficient communication algorithms is an inevitable challenge. This task is desirable to be done before the machine comes online since inefficient use of the system before the new algorithm's availability is a huge waste of a possibly hundreds of millions of dollars resource. In this poster, we demonstrate the usability of our simulation framework - BigSim, in meeting this challenge. Using BigSim, we observe that the commonly used Pairwise-Exchange algorithm for all-to-all communication pattern is suboptimal for the upcoming Blue Waters system. We design a new all-to-all algorithm for Blue Waters and predict a five-fold performance improvement for large message sizes using this algorithm.

Chair/Author Details:

Bernd Mohr (Chair) - Juelich Supercomputing Centre

Ehsan Totoni - University of Illinois at Urbana-Champaign

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