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A significant component of a high-performance cluster is the compute node interconnect. InfiniBand, is an interconnect of such systems that is enjoying wide success due to low latency (1.0-3.0?sec) and high bandwidth and other features. The Message Passing Interface (MPI) is the dominant programming model for parallel scientific applications. As a result, the MPI library and interconnect play a significant role in the scalability. These clusters continue to scale to ever-increasing levels making the role very important. As an example, the "Ranger" system at the Texas Advanced Computing Center (TACC) includes over 60,000 cores with nearly 4000 InfiniBand ports.
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