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For zyphra infrastructure and platform teams

Zyphra: AMD runtime, attention collective or input stall?

Connect the first useful exception with the relevant runtime evidence. Did the first stall occur inside the attention collective?

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Upload your log file. Review the selected evidence and masking, then run diagnosis. Keep the original log for any follow-up questions.

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What a useful evaluation should establish

Compare one incident your team already resolved with the first failure, cited evidence and remaining questions. Did the first stall occur inside the attention collective? Only assign a rank, device or safe recovery state when the submitted evidence establishes it.

Did the first stall occur inside the attention collective?

Evidence to compare: AMD runtime identity, per-worker progress and the first timed collective or kernel event.

Collective timing depends on topology and participating workers. Compare the earliest stalled stage rather than attributing a final timeout to NVIDIA hardware or a missing input without evidence.

Which accelerator backend produced this exception?

Evidence to compare: Actual device vendor, selected runtime backend and first initialization error.

CUDA, ROCm and other backends have different failure boundaries. Keep NVIDIA-specific hardware conclusions out of unsupported devices or unseen provider infrastructure.

Was input delivery interrupted before the timeout?

Evidence to compare: Input-reader progress, first read exception and matched worker timestamps.

A stalled input stage can leave downstream workers waiting. Establish the earlier event before attributing the final symptom to communication or device capacity.

Use Denpex alongside your existing telemetry tools to investigate submitted incident evidence. With monitoring configured on a supported plan, detected failures can trigger alerts and an automatic diagnosis from the captured evidence.

Inside Denpex

See the evidence, not just the claim

Follow the causal chain, inspect the quoted evidence and prepare the next handoff. These actual product captures use founder-account examples and the VS Code extension, with the source identified under each image. Open a capture to inspect it at full size.

Follow the failure through the cascade

Denpex founder-account example: a causal graph connects an Xid 48 ECC event to a rank exit and downstream collective failures, with quoted evidence for each stage.
Live founder-account capture from the bundled NCCL/ECC example. Follow the hardware event, rank exit and downstream symptoms with a supporting log quote at each stage.Inspect original image

Prepare the hardware escalation

Denpex hardware handoff summary asks the operator to capture diagnostic evidence and verify RMA eligibility with the vendor.
Actual hardware handoff summary from the same founder-account example. Capture diagnostic evidence before an approved reset, then confirm RMA eligibility with the vendor.Inspect original image

Ask for the evidence that is missing

Denpex historical example says a collective timeout does not establish the initiating rank, cause or failure domain and requests distinguishing evidence before a remedy.
Founder-account example restored from history. The original timeout remains unattributed, and the UI keeps the missing-evidence assessment visible.Inspect original image

Keep the investigation in the editor

Denpex VS Code extension displaying a bundled OOM-before-NCCL example, matched log evidence, verification guidance and an investigation handoff.
Actual VS Code extension capture of the bundled OOM-before-NCCL example. Review matched log evidence, verification guidance and the investigation handoff without leaving the editor.Inspect original image