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Conceptually, the Paragon is very similar to the CM-5.
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Bandwidth is higher
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Latency is longer
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The network topology is a two-dimensional torus
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To program these machines:
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Divide the problem to minimize number of messages while retaining parallelism
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Convert all references to global structures into references to local pieces
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Optimization: Pack messages together to reduce fixed overhead (almost always needed)
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Optimization: Carefully schedule messages (usually done by library)
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Every processor has a memory others canšt access.
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Advantages:
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Can be scalable
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Can hide latency of communication
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Disadvantages:
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Hard to program
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Program and O/S (and sometimes data) must be replicated
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