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fix(sat): fan check uses hottest GPU load + IPMI-hang-proof polling

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- GPU load switches from bee-gpu-burn (compute burn, ~88% TDP) to
  dcgmproftester -t 1004 / targeted_power via
  resolveBenchmarkPowerLoadCommand — the same engine Power/Thermal Fit
  uses and the hottest sustained NVIDIA load we have, so fans are
  actually pushed toward their ceiling.
- Sample loop is now IPMI-hang-proof: every ipmitool read is time-boxed
  in an abandonable goroutine, and the poll interval backs off
  geometrically (1s→30s) when reads are slow, tightening again on
  recovery. A plateau is only trusted while telemetry is healthy;
  degraded runs ride out to MaxLoadSec. Summary gains fan_samples /
  telemetry_degraded. Drops the per-second nvidia-smi+power+cpu-temp
  sampling from the hot loop.
- Dead code removed: FanStressRow, GPUStressMetric, sampleFanStressRow,
  sampleGPUStressMetrics, WriteFanStressCSV/WriteFanSensorsCSV,
  analyzeMaxTemp, sampleSystemPowerResolved.

Topology fan tiles:
- size encodes the fan's ceiling RPM (its class), not current speed;
  coloured fill rising from the bottom encodes live duty cycle
  (current / ceiling), shown only when the ceiling was measured.
- glyph spin rate now maps absolute RPM into a human-perceptible band
  (fanSpinPeriodSec: 2.2s/turn at <=1000 RPM, 0.35s at >=13000).
- the "N fans · N OK · tile size ∝ …" caption line is gone.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019VHG21rgTUiR1G3qFHTVmN
This commit is contained in:
Mikhail Chusavitin
2026-09-04 11:02:31 +03:00
co-authored by Claude Sonnet 5
parent bb2a501a28
commit 8cb250f3f4
6 changed files with 328 additions and 267 deletions
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bible-local/README.md
+3 -3
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@@ -76,7 +76,7 @@ Generic engineering rules live in `bible/rules/patterns/`.
- GPU bandwidth check
- `dcgmi diag -r nvbandwidth` (per CPU socket, then all selected GPUs, on multi-socket systems -- see `decisions/2026-07-27-nvbandwidth-per-socket-split.md`)
- Fan ceiling check (Load tier / `3. Load` only)
- `stressapptest` (or `stress-ng`) + `bee-gpu-burn` / `rvs gst` at 100%, run simultaneously
- `ipmitool sdr type Fan` sampled 1 Hz until every fan plateaus (~1 min flat) or the 15 min cap
- records each fan's observed peak RPM to `/var/log/bee-sat/fan-observation.json` (used by the Topology fan tiles); FAIL only on a fan at 0 RPM / IPMI cr-nr under load; **cancelled ("not applicable")**, never failed, if the host cannot be loaded or has no fan sensors
- `stressapptest` (or `stress-ng`) + the hottest GPU load — `dcgmproftester -t 1004` / `targeted_power` (Power/Thermal Fit engine), **not** `bee-gpu-burn` — run simultaneously
- `ipmitool sdr type Fan` on an adaptive interval (1 s floor, backs off to 30 s when the BMC gets slow, every read time-boxed) until every fan plateaus (~1 min flat, only trusted while telemetry is healthy) or the 15 min cap
- records each fan's observed peak RPM to the fan-observation store (used by the Topology fan tiles: size ∝ ceiling, fill ∝ duty cycle); FAIL only on a fan at 0 RPM / IPMI cr-nr under load; **cancelled ("not applicable")**, never failed, if the host cannot be loaded or has no fan sensors
- see `decisions/2026-09-04-fan-ceiling-check.md`