Exchange is another one of PMB's Parallel Transfer Benchmarks. Exchange is a
communications pattern that often occurs in grid splitting
algorithms (boundary exchanges). The group of processes is seen as a periodic
chain, and each process exchanges data with both left and right neighbor
in the chain.
The turnover count is 4 messages per sample (2 in, 2 out) for each process.
2-node Cluster Results
4-node Cluster Results
8-node Cluster Results
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#bytes #reps linux dom0 domU(noSMP) domU(SMP)
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#bytes #reps linux dom0 domU(noSMP) domU(SMP)
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#bytes #reps linux dom0 domU(noSMP) domU(SMP)
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#bytes #reps linux dom0 domU(noSMP) domU(SMP)
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#bytes #reps linux dom0 domU(noSMP) domU(SMP) -------------------------------------------------------------------------- 0 1000 281.54 429.36 565.25 973.46 1 1000 281.19 435.82 485.76 877.18 2 1000 285.75 433.47 482.67 1105.28 4 1000 285.90 435.85 486.66 820.09 8 1000 285.00 436.05 485.44 967.67 16 1000 304.95 438.99 620.95 1190.52 32 1000 286.06 445.63 631.08 1138.39 64 1000 287.67 450.57 502.23 888.69 128 1000 295.64 464.49 516.16 904.27 256 1000 342.10 511.82 565.61 1100.40 512 1000 366.18 632.50 657.13 2101.90 1024 1000 498.45 760.31 736.25 3239.72 2048 1000 779.28 1189.53 2699.41 11729.42 4096 1000 1155.15 1336.72 1530.59 12422.06 8192 1000 2257.39 2753.39 7470.11 22706.57 16384 1000 4199.82 4465.29 16938.53 30219.32 32768 1000 11746.70 12464.87 29844.82 72139.23 65536 640 24965.25 28936.41 42195.51 116714.49 131072 320 64966.33 64104.88 101934.76 231995.28 262144 160 132964.32 130781.39 143293.85 374124.26 524288 80 261793.36 263867.58 255780.38 651676.86 1048576 40 510482.33 520217.42 542601.23 1128027.18 2097152 20 1078979.11 1061722.18 1060231.26 2580126.19 4194304 10 2222642.98 2224997.34 2259047.59 4805922.79
#bytes #reps linux dom0 domU(noSMP) domU(SMP) -------------------------------------------------------------------------- 0 1000 0.00 0.00 0.00 0.00 1 1000 0.01 0.01 0.01 0.00 2 1000 0.03 0.02 0.02 0.01 4 1000 0.05 0.04 0.03 0.02 8 1000 0.11 0.07 0.06 0.03 16 1000 0.20 0.14 0.10 0.05 32 1000 0.43 0.27 0.20 0.11 64 1000 0.85 0.54 0.49 0.28 128 1000 1.65 1.05 0.95 0.54 256 1000 2.89 1.91 1.72 0.88 512 1000 5.33 3.09 2.97 0.97 1024 1000 7.86 5.14 5.30 1.28 2048 1000 10.02 6.57 2.99 0.68 4096 1000 13.52 11.69 10.21 1.25 8192 1000 13.85 11.37 4.18 1.44 16384 1000 14.88 13.99 3.69 2.06 32768 1000 10.64 10.02 4.19 1.73 65536 640 10.01 8.64 5.94 2.15 131072 320 7.69 7.79 4.91 2.15 262144 160 7.51 7.64 6.98 2.67 524288 80 7.61 7.55 7.78 3.05 1048576 40 7.77 7.62 7.30 3.50 2097152 20 7.28 7.41 7.42 3.02 4194304 10 6.93 6.98 6.87 3.13
