system blocking when do megatron update load weights
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- Dominant language
- Python
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Description
During the training of GLM-AIR with colocate mode, we encountered a system freeze, and after a period of time, a watchdog timeout error would occur.
I'm not sure if this code snippet is the cause, since it could potentially lead to processes in this group using different src_ranks during toch.distribute.broacast?
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Research direction
Start with slime/backends/megatron_utils/update_weight_utils.py at line 475 and inspect the surrounding weight-loading path and torch.distributed broadcast usage. Reproduce the GLM-AIR colocate-mode training freeze if possible, then determine whether inconsistent source ranks cause the watchdog timeout and verify the resolved behavior under that workload.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python, pytorch
- Domain
- distributed-systems, machine-learning
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100