Abstract
Today's communication architectures for parallel machines reduce communication overheads and latencies by over an order of magnitude. However, carrying over these techniques to workstation clusters connected by an ATM network presents major design challenges. We discuss the differences in communication characteristics between workstation clusters built from standard hardware and software components and state-of-the-art multiprocessors, and then evaluate a prototype implementation of an active message communication layer. Application round-trip latencies of about 50 microseconds for small messages roughly compare to a similar implementation on the Thinking Machines CM-5 multiprocessor.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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