nccl tests
2 articles
NCCL Algorithms and Protocols: Selection and Debugging
A 2026 guide to NCCL algorithms and protocols, covering Ring, Tree, LL, LL128 and NVLS, versioned controls, tuning logs, bandwidth formulas and reversible diagnostic experiments.
October 12, 2026• 22 min read
nccl algorithms and protocolsnccl ring vs treenccl ll128
GPU Cluster Acceptance Testing: DCGM and NCCL Runbook
A 2026 evidence runbook for GPU cluster acceptance testing, with DCGM and NCCL commands, pass and skip rules, pair-coverage math, and a contractual acceptance matrix.
September 18, 2026• 21 min read
gpu cluster acceptance testingdcgm diagnosticsnccl tests