Optimal communication performance on fast ethernet with GAMMA

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The current prototype of the Genoa Active Message MAchine (GAMMA) is a low-overhead, Active Messages-based inter-process communication layer implemented mainly at kernel level in the Linux Operating System. It runs on a pool of low-cost Pentium-based Personal Computers (PCs) networked by a low-cost 100base-TX Ethernet hub to form a low-cost message-passing parallel platform. In this paper we describe in detail how GAMMA could achieve unprecedented communication performance (less than 13 μs one-way user-to-user latency time and up to 98% of the communication throughput of the raw interconnection hardware) on such a kind of low-cost parallel architecture.