Technology-Driven, Highly-Scalable Dragonfly Topology

Evolving technology and increasing pin-bandwidth motivate the use of high-radix routers to reduce the diameter, latency, and cost of interconnection networks. High-radix networks, however, require longer cables than their low-radix counterparts. Because cables dominate network cost, the number of ca...

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Vydáno v:2008 International Symposium on Computer Architecture s. 77 - 88
Hlavní autoři: Kim, John, Dally, Wiliam J., Scott, Steve, Abts, Dennis
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: Washington, DC, USA IEEE Computer Society 01.06.2008
IEEE
Edice:ACM Conferences
Témata:
Bandwidth
Cables
Computer architecture
Costs
Delay
dragonfly
Hardware
Hardware > Hardware validation
Hardware > Integrated circuits > Interconnect
Hardware > Integrated circuits > Interconnect > Input > output circuits
interconnection networks
Multiprocessor interconnection networks
Network topology
Optical network units
Optical sensors
Routing
topology
dragonfly
interconnection networks
topology
ISBN:9780769531748, 0769531741
ISSN:1063-6897
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Popis
Shrnutí:Evolving technology and increasing pin-bandwidth motivate the use of high-radix routers to reduce the diameter, latency, and cost of interconnection networks. High-radix networks, however, require longer cables than their low-radix counterparts. Because cables dominate network cost, the number of cables, and particularly the number of long, global cables should be minimized to realize an efficient network. In this paper, we introduce the dragonfly topology which uses a group of high-radix routers as a virtual router to increase the effective radix of the network. With this organization, each minimally routed packet traverses at most one global channel. By reducing global channels, a dragonfly reduces cost by 20% compared to a flattened butterfly and by 52% compared to a folded Clos network in configurations with ≥ 16K nodes.We also introduce two new variants of global adaptive routing that enable load-balanced routing in the dragonfly. Each router in a dragonfly must make an adaptive routing decision based on the state of a global channel connected to a different router. Because of the indirect nature of this routing decision, conventional adaptive routing algorithms give degraded performance. We introduce the use of selective virtual-channel discrimination and the use of credit round-trip latency to both sense and signal channel congestion. The combination of these two methods gives throughput and latency that approaches that of an ideal adaptive routing algorithm.
ISBN:9780769531748
0769531741
ISSN:1063-6897
DOI:10.1109/ISCA.2008.19