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Which of the following NCCL environment variables enable SHARP aggregation with NCCL when using the NCCL-SHARP plugin? Pick the 2 correct responses below
Correct Answer: A,D
To enable SHARP (Scalable Hierarchical Aggregation and Reduction Protocol) aggregation using theNCCL- SHARP plugin, the following two environment variables are required: * NCCL_COLLNET_ENABLE=1 Enables NCCL's support for CollNet (Collective Network) operations, including SHARP. * NCCL_SHARP_AUTOINIT=1 Automatically initializes the SHARP plugin when available, activating SHARP-based collectives. From theNVIDIA NCCL User Guide - SHARP Plugin Section: "NCCL_COLLNET_ENABLE must be set to enable collective network acceleration features." "NCCL_SHARP_AUTOINIT enables automatic SHARP plugin integration at NCCL runtime." Incorrect Options: * B. NCCL_ALGO=CollNet- This variable controls the algorithm used for collectives but does not enable SHARP. * C. NCCLSPECTRUM_ENABLE- This is not a documented NCCL variable. Reference: NCCL SHARP Plugin Guide & NCCL User Guide - Environment Variables Section
