Explain what torch.distributed.barrier does

Question

In PyTorch distributed training, what is the purpose of torch.distributed.barrier()?

Follow-ups

• Describe a scenario where you would call it.
• What can go wrong if it is invoked incorrectly?
• What is its connection to deadlocks and performance?

Overview: This question tests familiarity with PyTorch's distributed synchronization primitives, coordination across processes, and concurrency control in distributed training.

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