A B300 field report shows utilization can hide training deadlocks
Engineers documenting full fine-tuning of Qwen3-32B across sixteen NVIDIA B300 GPUs found board power more diagnostic than reported utilization during NCCL hangs and built a 2.7-second pre-run invariant check.
Why it matters: A smoke test and 100% utilization can coexist with a distributed job that will never complete.