Diagnosing Hangings and Deadlocks in Multi-Node Multi-GPU Python Programs
August 13, 2026 ยท View on GitHub
Moved to Debugging PyTorch Programs.
Helper tools
Moved to Debugging PyTorch Programs.
Approaches to diagnosing multi-gpu hanging / deadlocks
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py-spy
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multi-process py-spy
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multi-node py-spy via srun
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multi-node py-spy via pdsh
Moved to Debugging PyTorch Programs.
multi-node py-spy via ds_ssh
Moved to Debugging PyTorch Programs.
Network-level hanging
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Isolate problematic GPUs
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python trace
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NicerTrace
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Working with generated trace files
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good old print
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core files
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Code loops
Moved to Debugging PyTorch Programs.
Hardware-specific issues
Moved to Debugging PyTorch Programs.