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A Case for Random Shortcut Topologies for HPC Interconnects

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Executive Summary

As the scales of parallel applications and platforms increase the negative impact of communication latencies on performance becomes large. Fortunately, modern High Performance Computing (HPC) systems can exploit low-latency topologies of high-radix switches. In this paper, the authors propose the use of random shortcut topologies, which are generated by augmenting classical topologies with random links. Using graph analysis they find that these topologies, when compared to non-random topologies of the same degree, lead to drastically reduced diameter and average shortest path length. The best results are obtained when adding random links to a ring topology, meaning that good random shortcut topologies can easily be generated for arbitrary numbers of switches.

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