InfiniBand is one of the most popular interconnection network standards in HPC. InfiniBand standard defines variety of routing algorithm to be configured to the Subnet Manager (SM). InfiniBand architecture supports deterministic routing. This may prevents packets from using alternative paths when the requested output port is busy, thus may lead to network performance degradation .
Adaptive Routing (AR) algorithms will dynamically select the route of a packet based on the network switches availability to deliver the packet. AR is controlled by the Subnet Manager (SM) while the switch is performing the routing decision to achieve lowest latency and maximum bandwidth accumulated over all pairs in the network achieving highest possible efficiency of the network.
This post discussed the needs for Adaptive Routing for HPC, and supply configuration examples and Performance Analysis.
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