| 摘要 |
An interconnection method is disclosed for connecting multiple sub-neworks providing significant improvements in performance and reductions in cost. The method interconnects copies of a given sub-network, e.g., a 2-hop Moore graph sub-network, or a 2-hop Flattened Butterfly sub-network. Each sub-network connects to every other sub-network over multiple links, and the originating nodes in each sub-network lie at a maximum distance of 1 hop from all other nodes in that sub-network. This set of originating nodes connects to a set of similarly chosen nodes in another sub-network, for each pair of sub-networks, to produce a system-wide diameter of 4 (maximum of 4 hops between any two nodes), given 2-hop sub-networks. For example, to reach a given remote sub-network j, starting at a node in sub-network i, a packet must first reach any one of the local sub-network i's originating nodes, connected to nodes in remote sub-network j. This takes at most one hop. Another hop reaches the remote sub-network j, where it takes at most two hops to reach the desired node. The disclosed interconnection methodology scales up to billions of nodes in an efficient manner, keeping the number of required ports per router low, the number of hops to connect any given pair of nodes low, the bisection bandwidths high, and it provides easily determined routing. Moreover, because each sub-network can be identical, only one PCB design for the subnet needs to be designed, tested, and manufactured. All of these design features significantly reduce costs and while also significantly increasing performance. |
