Abstract:

With the increasing peak performance of the high performance computers, high performance interconnection network is facing more design challenges. Enabled by advancements in high bandwidth serial transport technology and pin bandwidth, high performance interconnection network paves the way for high-radix network. How to utilize high-radix router providing more design choices is the key for high performance network topology. The paper studies several typical high-radix topologies. We analyze the performance and cost of those high-radix networks theoretically and compare them with common low-radix topologies. A high-radix interconnection network simulator, named xNetSim, is explored to evaluate these topologies. xNetSim is built in the OMNeT++ platform. In the simulation, the network loads is varied and the throughput and latency of different topologies are verified. At last, the performance gaps between these kinds of high-radix interconnection network topologies are briefly analyzed.

Key words: high-radix router;network topology;high performance interconnection network