Cost-Efficient Dragonfly Topology for Large-Scale Systems
John Kim, William J. Dally, Steve Scott, Dennis Abts · IEEE Micro · 2009
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.