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Equation 7 · The Network Is the Computer Again

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The classical accounting for a collective operation separates three terms: a per-message latency, a per-byte transfer cost, and a per-byte computation cost for reductions [ 2 ] . Writing α\alpha for latency per message, β\beta for transfer time per byte and γ\gamma for reduction time per byte, the cost of a collective over p participants on n bytes takes the shape

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