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A low-diameter, fast interconnection network is going to be a prerequisite for building exascale machines. A two-level direct network has been proposed by several groups as a scalable design for future machines. IBM's PERCS topology and the dragonfly network discussed in the DARPA exascale hardware study are examples of this design. The presence of multiple levels in this design leads to hot-spots...
Although distributed computing over a network of computers has become a reality; its success mainly depends on the performance of the underlying topology. The number of users may grow way beyond the number for which the physical topology was originally designed for, resulting in performance degradation. In such situation, the redesign of network topology is an essential scheme to improve the performance...
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