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# Performance reported by NCCL tests
NCCL tests report the average operation time in ms, and two bandwidths in GB/s : algorithm bandwidth and bus bandwidth. This page explains what those numbers mean and what you should expect depending on the hardware used.
NCCL tests report the average operation time in ms, and two bandwidths in GB/s : algorithm bandwidth and bus bandwidth. The measurement is of a unidirectional bandwidth. This page explains what those numbers mean and what you should expect depending on the hardware used.
# Time