Power Virus and Thermal Stress Testing: Reports and Metrics

Reports and metrics

Reports and Metrics for Power Virus and Thermal Stress Testing is anchored on Worst-case sustained power, hotspot temperature, throttling onset, and recovery behavior under stress kernels.. Convert measurements into mechanism-backed decisions with clear owner accountability.

A useful report explains why movement happened, not only that movement happened.

Evidence matrix

EVIDENCE MATRIX - Power Virus and Thermal Stress Testing

+-----------------------------+--------------------------------+--------------------------------+---------------------------+
| Evidence                    | Tells you                      | Does not prove                 | Next action               |
+-----------------------------+--------------------------------+--------------------------------+---------------------------+
| occupancy + timeline traces | where utilization is lost      | precise root cause             | map to memory and schedule|
| cache/SRAM/bandwidth stats  | data movement pressure         | model-level quality impact     | correlate with quality run|
| counter + profile alignment | bottleneck class confidence    | rollout safety                 | run full regression matrix|
| thermal/power telemetry     | sustained operating envelope   | correctness closure            | pair with verification    |
| before/after scenario pack  | mitigation movement            | long-tail stability            | execute guardrail replay  |
+-----------------------------+--------------------------------+--------------------------------+---------------------------+

• Track Worst-case sustained power, hotspot temperature, throttling onset, and recovery behavior under stress kernels. on representative production workloads.

• Include build/runtime metadata in every report header.

• Correlate throughput, latency, and quality before rollout decisions.

• Call out contradictory evidence explicitly.

AI accelerator deep dive

Bring-up speed and correctness depend on designed-in observability and replayable debug flow.

Concept diagram

BRING-UP EVIDENCE LOOP

failure symptom -> trace packet -> replay -> isolate root cause -> bounded fix

Metric graph

OBSERVABILITY VALUE

directed tests only      ██████████
plus counters            ███████
plus trace and replay    ███

Metrics and artifacts to collect

• counter completeness

• trace trigger coverage

• replay success rate

• escape-risk trend

Mini case study

A silicon-only regression closed quickly because trace identity and counter alignment were planned before tapeout.

Debug branches

• Start from first failing trace window

• Align software and hardware timestamps

• Demand reversible owner fix before signoff

Senior review question

Ask: which first-principles bottleneck class explains the symptom, and what artifact proves it reproducibly?

Key takeaways

• Tie every accelerator claim to a reproducible workload slice and one primary metric trend.

• Prefer bounded fixes with clear owner and rollback boundary over broad tuning bundles.

Common pitfalls

• Optimizing synthetic kernels without production-shape validation.

• Reading average latency while ignoring p95 and p99 behavior.

• Declaring sparse or precision wins without fallback and quality evidence.

Report interpretation

Power-virus workloads intentionally maximize switching activity across compute and memory fabrics to test package, cooling, and DVFS control margins. Thermal testing should include steady-state and transient bursts to capture hotspot migration, sensor lag, and control-loop stability. Bring-up teams compare measured envelopes against pre-silicon estimates to validate guardbands and identify hidden leakage or IR-drop sensitivities. Early stress characterization prevents field failures where real customer workloads combine high utilization with unfavorable ambient conditions. A useful explanation always ties observed symptom to a repeatable path where useful work was blocked, delayed, or diluted by overhead.

Use Worst-case sustained power, hotspot temperature, throttling onset, and recovery behavior under stress kernels. as an alarm, then anchor action using hard evidence such as Thermal and power stress report with limits, throttle policy checks, and mitigation recommendations..

Signoff strength comes from proving first-silicon observability and reproducible closure paths. Senior reviews expect a chain of proof: workload intent -> mapping -> hardware behavior -> product impact.

For Power Virus and Thermal Stress Testing, reports should explain why Worst-case sustained power, hotspot temperature, throttling onset, and recovery behavior under stress kernels. moved and which path consumed budget first.