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Title:
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TORUS-CONNECTED TOROIDS: AN INTERCONNECTION NETWORK FOR MASSIVELY PARALLEL SYSTEMS |
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Author(s):
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Antoine Bossard |
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ISBN:
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978-989-8704-44-3 |
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Editors:
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Hans Weghorn and Pedro Isaias |
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Year:
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2022 |
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Edition:
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Single |
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Keywords:
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Interconnect, Dependability, Supercomputer, High-Performance, Routing, Topology |
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Type:
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Full Paper |
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First Page:
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21 |
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Last Page:
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28 |
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Language:
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English |
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Cover:
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Full Contents:
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click to dowload 
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Paper Abstract:
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Modern supercomputers are massively parallel systems which include hundreds of thousands of compute nodes. To maximise performance, connection of these nodes is critical. To this end, torus-based interconnection networks have proven popular. For instance, the world no. 1 supercomputer as of May 2022, the Fujitsu Fugaku machine, is based on the torus topology. On the other hand, the network dimension of such torus-based devices is kept rather low, for instance three for the Fujitsu Fugaku supercomputer. So, in order to connect the numerous compute nodes with such a conventional approach, the arity of the torus is increased, which is at the cost of a greater diameter. Additional layers can also be introduced, thus inducing hierarchical interconnection networks (HIN). In this paper, we describe a novel topology for the interconnection network of massively parallel systems: torus-connected toroids. The merit of this network compared to existing topologies is that while retaining the popular torus structure, it smartly combines it with another layer, toroids, to reduce the diameter of the network. The proposal is formally evaluated and compared to conventional approaches to show its advantages. |
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