NCCL symmetric memory: faster small-payload comms in a few lines of code
StasBekman · x · 2026-10-05
- Stas Bekman, author of the 19.1k-star ml-engineering repo, highlights newly added symmetric memory support in NCCL and PyTorch, which yields much faster NCCL comms at small-to-medium payloads.
- For engineers struggling to overlap comms and compute during LLM training, this could be the fix in just a few lines of code.
- Details are documented in the repo's networking chapter, covering inter-node/intra-node hardware and RDMA background.
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