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	SCHEDULE: NOV 11-17, 2006 Energy/Performance Modeling for Collective Communication in 3-D Torus Cluster Networks Session: Poster Reception Event Type: Poster Time: 5:15pm - 7:15pm Author(s): S. Conner, G. M. Link, S. Tobita, M. J. Irwin, P. Raghavan Location: Ballroom Corridor Abstract: As supercomputers scale ever larger, energy consumption in interconnection networks is an emerging problem. In this work, we analyze the energy consumption and traffic patterns in a 3-D torus network in order to locate and exploit opportunities to save energy by disabling network links dynamically. Using a custom-built simulator, TorusSim, we show that, for common scientific computing codes that utilize collective communications, regularities in the network and algorithmic data flow result in many unused and under-utilized links that can be disabled to save energy at no performance cost. In the case of a reduce operation, we see that at least 56% of the links in a 4x4x4 torus network can be disabled during communication, with significant other opportunity to save energy on under-utilized links that could lead to over 80% overall link energy savings. Chair/Author Details: S. Conner Pennsylvania State University G. M. Link Pennsylvania State University S. Tobita Pennsylvania State University M. J. Irwin Pennsylvania State University P. Raghavan The Pennsylvania State University
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