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glm: TF_GLM_PREFILL_REDUCE=ring, for fabrics where a rank reaches only its neighbours - #902

Merged

ashhart merged 2 commits into

ashhart:mainfrom

Bizuayeu:pr/glm-ring-split

Oct 18, 2026

Merged

glm: TF_GLM_PREFILL_REDUCE=ring, for fabrics where a rank reaches only its neighbours#902
ashhart merged 2 commits into
ashhart:mainfrom
Bizuayeu:pr/glm-ring-split

Commits on Oct 16, 2026
- glm: TF_GLM_PREFILL_REDUCE=ring passes split's exchanges along the ring, for a fabric where a rank reaches only its neighbours
  Bizuayeu
  committed
  3b0093a
- nccl: Library.group ends a group whose post failed, so later calls stay out of it; the ring relay posts through it, and a fake NCCL fails each posting in turn
  Bizuayeu
  committed
  98a5dc6