Unverified50% confidenceFactExact time
NCCL automatically selects the optimal algorithm based on topology, using a two-level hierarchical strategy: within a node, the Ring algorithm is used via NVLink (H100 bandwidth up to 900 GB/s), and between nodes, the Tree or Recursive Halving-Doubling algorithm is used via InfiniBand.
1
Sources
50%
Confidence
Long-term
Relevance
8/7/2026
First Seen
Sources
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