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nvshmem-configure-nic-pe-mapping

Recommend NVSHMEM NIC-to-PE mappings and environment exports. Use for HCA selection, multi-NIC configuration, or topology-based mapping diagnostics.

skills/nvshmem-configure-nic-pe-mapping/SKILL.md

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# Tune NVSHMEM NIC-to-PE Mapping

## Purpose

Produce a reproducible recommendation from the target node's actual GPU/NIC topology. Do not promise a performance improvement; present the mapping as a topology-informed starting point that must be validated.

## Requirements

- Use an allocated target compute node with visible GPUs and RDMA devices; do not use login-node topology as evidence.
- Make `nvidia-smi` and `/sys/class/infiniband` readable on that node. If `/sys` is unavailable, make `ibv_devinfo` available or provide equivalent per-port evidence.
- Provide the NVSHMEM installation prefix, make `nvshmem-info` available on the target node, or supply the installed NVSHMEM version explicitly.
- Use the bundled read-only collector when possible. It requires no API keys, credentials, package installation, or writable filesystem access.

## Inputs