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Add "Interpreting TPU States" section to megascale debugging doc. #120633

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copybara-service merged 1 commit into from
Jun 8, 2026
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Add "Interpreting TPU States" section to megascale debugging doc. #120633

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22 changes: 21 additions & 1 deletion third_party/xla/docs/megascale/debugging_workflow.md
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Expand Up @@ -44,6 +44,26 @@ Megascale hang detected: Timed out waiting for 4 graphs to complete at launch_id

### Diagnosis

#### Interpreting TPU States

Before diagnosing MXLA hangs, it is important to understand the TPU states
report format. Below is a sample report:

```text
Full error digest:
Potential cause: <determined_cause>
Potential culprit workers: <task_name>
First error timestamp: <timestamp>
First error type: <error_type>
TPU states:
Launch ID: <launch_id>
Module: jit.step_fn Fingerprint: <fingerprint>
Sample worker: <task_name>@<host_name>:<tpu_chip>:<tpu_core>
Tag:PC breakdown:
<num_cores>@<location>(HLO): [<task_name>:<host_name>@<tpu_chip>:<tpu_core>, ...]
...
```

#### Bad TPU Chip (tensor core or sparse core)

```text
Expand Down Expand Up @@ -313,4 +333,4 @@ in order to share them with the XLA or Megascale team.

**Note on Future Tooling:** Google is actively working on open-sourcing versions
of diagnostic dashboards to provide a more streamlined experience for Cloud TPU
customers to identify and diagnose stragglers. These will be available soon.
customers to identify and diagnose stragglers. These will be available soon.
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