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LinkTest can test different process-process combinations in parallel. What connections are tested in parallel to other connections and when is defined by the communication pattern. Given an even number of processes, say 16, LinkTest, in its default configuration, can test 16 of the potential 240 connections by testing between 8 exclusive pairs forwards and backwards. To test the remaining 224 possible connections requires repeating this 14 additional times. Each time LinkTest can test connections in parallel is called a step, so to test the connections between 16 processes takes about 15 steps.
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A communication pattern defines which connections are tested together in parallel. Continue with our example of
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```math
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\\Delta = \\nabla^2 = \\frac{\\partial^2 f}{\\partial x^2} + \\frac{\\partial^2 f}{\\partial y^2}
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``` |
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\ No newline at end of file |