Mapping Strategies for the PERCS Architecture
  The PERCS system was designed by IBM in response to a DARPA challenge that called for a high-productivity high-performance computing system. The IBM PERCS architecture is a two level direct network having low diameter and high bisection bandwidth. Mapping and routing strategies play an important role in the performance of applications on such a topology. In this paper, we study mapping strategies for PERCS architecture, that examine how to map tasks of a given job on to the physical processing nodes. We develop and present fundamental principles for designing good mapping strategies that minimize congestion. This is achieved via a theoretical study of some common communication patterns under both direct and indirect routing mechanisms supported by the architecture. 
Venkatesan T. Chakaravarthy and Naga Praveen Kumar Katta and Monu   Kedia and Ramakrishnan Rajamony and Aruna Ramanan and Yo...
cs.DC