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PRODID:-//Microsoft Corporation//Outlook MIMEDIR//EN
VERSION:1.0
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DTSTART:20111116T011500Z
DTEND:20111116T030000Z
LOCATION:WSCC North Galleria 2nd/3rd Floors
DESCRIPTION;ENCODING=QUOTED-PRINTABLE: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=0ABlue 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.
SUMMARY:Optimizing All-to-All Algorithm for Blue Waters Using Simulation
PRIORITY:3
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