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The PERCS system was designed by IBM in response to a DARPA challenge thatcalled for a high-productivity high-performance computing system. The IBM PERCSarchitecture is a two level direct network having low diameter and highbisection bandwidth. Mapping and routing strategies play an important role inthe performance of applications on such a topology. In this paper, we studymapping strategies for PERCS architecture, that examine how to map tasks of agiven job on to the physical processing nodes. We develop and presentfundamental principles for designing good mapping strategies that minimizecongestion. This is achieved via a theoretical study of some commoncommunication patterns under both direct and indirect routing mechanismssupported by the architecture.

Mapping Strategies for the PERCS Architecture