Engineering topics
Grunau, Daryl W.
Publications and source records attributed to Grunau, Daryl W..
Typhoon IB Performance
While running fundamental IB verbs testing on the Typhoon cluster, it was discovered that IB performance was not satisfactory for a QDR system. The theoretical maximum bandwidth expected on a QDR system is 32Gb/sec. After significant testing and analysis, RDMA read performance was consistently shown to be 50% lower than RDMA write performance, resulting in significantly less than half the theoretical maximum. Thorough testing and analysis identified a BIOS setting as the reason for this behavior.
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