NCCL log analyzer
Paste NCCL_DEBUG=INFO output to highlight ranks, errors, GDR usage, and topology decisions.
Drop a chunk of NCCL_DEBUG=INFO (or NCCL_DEBUG=WARN) output below and the page will tag warning/error lines, surface vendor err codes with a quick diagnosis, decide whether GDR is active, and tally rings vs trees announced. Useful when triaging a multi-node training run that just blew up.
Paste NCCL output above to begin.