Section: New Results

High-Performance Point-to-Point Communications

Participants : Alexandre Denis, Raymond Namyst.

• NewMadeleine is our communication library designed for high performance networks in clusters. We have worked on optimizations on low-level protocols so as to improve point-to-point performance.

• We have proposed [29] auto-tuning mechanisms for most parameters of a communication library: rendez-vous threshold, multi-rail ratio, optimization strategies.

• We have proposed a communication protocol [33] for InfiniBand that completely amortizes the cost of memory registration, through the use of a superpipeline that overlaps communication and memory copies. We have modeled the behavior of the network and proposed auto-tuning mechanism to adapt the protocol to the hardware properties.