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Add link to NCCL analysis paper to NCCL page
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docs/software/communication/nccl.md

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@@ -20,6 +20,8 @@ While the container engine sets these automatically when using the NCCL hook, th
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--8<-- "docs/software/communication/nccl_env_vars"
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[_Demystifying NCCL: An In-depth Analysis of GPU Communication Protocols and Algorithms_](https://arxiv.org/abs/2507.04786v2) contains detailed information about NCCL algorithms and protocols, which can be helpful for deciding if your application could benefit from an alternative configuration.
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!!! warning "Using NCCL with uenvs"
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The environment variables listed above are not set automatically when using uenvs.
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