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For johns hopkins rockfish infrastructure and platform teams

Johns Hopkins Rockfish: GPU memory class or input filesystem?

Connect the first useful exception with the relevant runtime evidence. Which Rockfish GPU memory class was assigned?

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Replay a resolved Johns Hopkins Rockfish workflow incident

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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Up to 50 diagnoses a day for 30 days. Verify your work email to activate an eligible company evaluation, then replay a resolved incident and compare the evidence and next steps with your team's confirmed cause.

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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. Which Rockfish GPU memory class was assigned? Only assign a rank, device or safe recovery state when the submitted evidence establishes it.

Which Rockfish GPU memory class was assigned?

Evidence to compare: Allocated device model and memory, job request and first allocation traceback.

One GPU family can contain different memory capacities. Compare the assigned device before treating a model that fits another node as evidence of faulty hardware.

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.

Did artifact writing complete before storage filled?

Evidence to compare: Approved output path, quota result and the saved-artifact writer completion.

A full filesystem can invalidate the latest save even when training reached its final step. The existence of a filename does not establish a complete recovery checkpoint.

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