Google Research

Cost-efficient Dragonfly Topology for Large-scale Systems

  • John Kim
  • William J. Dally
  • Steve Scott
  • Dennis Abts
IEEE Micro, vol. Vol 29, Issue 1 (Jan/Feb 2009) (2009), pp. 33-40


It is more efficient to use increasing pin bandwidth by creating high-radix routers with a large number of narrow ports instead of low-radix routers with fewer wide ports. Building networks using high-radix routers lowers cost and improves performance, but also presents many challenges. The dragonfly topology minimizes network cost by reducing the number of global channels required.

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