Abstract
A communication layer NICAM is designed to reduce the overhead and latency by directly utilizing a micro-processor equipped on the network interface. NICAM runs active messages handlers on the network interface for flexibility in programming. Running message handlers on the network interface reduces the overhead by freeing the main processors from the work of polling incoming messages, and also reduces the latency in synchronizations by avoiding costly interactions between the main processors and the network interface. Moreover, this makes it possible to hide latency of barriers completely in data-parallel programs, because barriers can be performed in the background of the main processors.
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