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With the correct pinning we can now test the core-to-core connectivity on a node. For reliable numbers it is, however, imperative to use a sufficient number of messages, including warm-up messages. We chose to use 2000 messages for testing and 200 for warm up with a message size of 1 MiB. Testing was performed via ParaStation MPI 5.4.10-1 which uses local memory for transfers when possible.
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The results of this test for two different identically configured nodes can be seen in this report: [JURECA-DC_AMD-EPYC-7742.pdf](uploads/15b18b5e70bef06406ca25d33e6e8766/JURECA-DC_AMD-EPYC-7742.pdf). A newer test using unidirectional MPI and taking the median across 64 CPUs results in less noisy results: [JURECA-DC_AMD-EPYC-7742_MedianCorrected.pdf](uploads/fbf7c1470f2edb0616f9fa1c9500143b/JURECA-DC_AMD-EPYC-7742_MedianCorrected.pdf). Note that for this report the central purple blocks along the diagonal come from a single test sending 8192 messages. This report is shown below:
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The results of this test for two different identically configured nodes can be seen in this report: [JURECA-DC_AMD-EPYC-7742.pdf](uploads/15b18b5e70bef06406ca25d33e6e8766/JURECA-DC_AMD-EPYC-7742.pdf). The upcoming paragraphs are based on this report. A newer test using unidirectional MPI and taking the median across 64 CPUs results in less noisy results: [JURECA-DC_AMD-EPYC-7742_MedianCorrected.pdf](uploads/fbf7c1470f2edb0616f9fa1c9500143b/JURECA-DC_AMD-EPYC-7742_MedianCorrected.pdf). Note that for this report the central purple blocks along the diagonal come from a single test sending 8192 messages. This report is shown below:
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