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How to Configure GPUDirect RDMA and Prove Multi-Node GPU Performance with NCCL

TL;DR A working GPU driver, an RDMA device inside a pod, and a completed NCCL test do not prove that GPUDirect RDMA is working efficiently. Production validation must prove the complete path: GPU topology, GPU-to-NIC affinity, PCIe peer access, IOMMU and ACS behavior, RDMA fabric health, container resource exposure, NCCL transport selection, and repeatable multi-node

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