add agent skill for debugging distributed training log failures#15612
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pzelasko merged 1 commit intoApr 15, 2026
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gaikwadabhishek
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Apr 15, 2026
gaikwadabhishek
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- add /debug-training-logs slash command that analyzes SLURM worker stderr logs and optional AIStore daemon logs to find root causes of distributed training failures
- covers NCCL timeout analysis: distinguishes straggler ranks (stuck in data loading) from GPU fabric hangs by comparing enqueued vs completed work across ALL ranks
- includes AIStore log parsing: file time ranges, timezone verification, error counter tracking, proxy/target correlation
- documents NeMo-specific sync points (PreemptionCallback broadcast, checkpoint broadcasts, DDP allreduce) that can cause rank desync
- documents Lhotse data loading pitfalls: missing read timeouts, m4a BytesIO extension loss, idle connection resets, fault_tolerant silent drops
- includes instructions to obtain logs via scp and download AIS daemon logs via ais CLI with env var auth
- add /debug-training-logs slash command that analyzes SLURM worker stderr logs and optional AIStore daemon logs to find root causes of distributed training failures - covers NCCL timeout analysis: distinguishes straggler ranks (stuck in data loading) from GPU fabric hangs by comparing enqueued vs completed work across ALL ranks - includes AIStore log parsing: file time ranges, timezone verification, error counter tracking, proxy/target correlation - documents NeMo-specific sync points (PreemptionCallback broadcast, checkpoint broadcasts, DDP allreduce) that can cause rank desync - documents Lhotse data loading pitfalls: missing read timeouts, m4a BytesIO extension loss, idle connection resets, fault_tolerant silent drops - includes instructions to obtain logs via scp and download AIS daemon logs via ais CLI with env var auth Signed-off-by: Abhishek Gaikwad <gaikwadabhishek1997@gmail.com>
pzelasko
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Apr 15, 2026
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Amazing work @gaikwadabhishek!
First Agentic Skill to be merged in NeMo :)
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Thank you for this skill. Looks very useful! |
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