Add Megascale Hangs Playbook as a how-to guide - #2490
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melissawm
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October 13, 2025 13:39
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| For example, use | ||
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| ```python | ||
| jax._src.distributed.global_state.client.wait_at_barrier("<barrier_id>") | ||
| multihost_utils.sync_global_devices(...) | ||
| ``` | ||
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| for worker synchronization. |
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How about something like this instead?
As an example, this could occur when using an all-reduce to synchronize at the end of checkpoint loading. One possible solution would be to switch this collective barrier to use the JAX distributed wait_at_barrier API instead:
jax._src.distributed.global_state.client.wait_at_barrier(...)
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Description
Adds the Megascale Hangs Playbook as a how-to guide. Initial content review done by @bvandermoon
Tests
Documentation currently builds successfully despite warnings (as flagged in #2356)
Checklist
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gemini-reviewlabel.