bee/bible-local/docs/gpu-model-propagation.md

GPU Model Name Propagation

How GPU model names are detected, stored, and displayed throughout the project.

---

Detection Sources

There are two separate pipelines for GPU model names — they use different structs and don't share state.

Pipeline A — Live / SAT (nvidia-smi query at runtime)

File: audit/internal/platform/sat.go

• ListNvidiaGPUs() → NvidiaGPU.Name (field: name, from nvidia-smi --query-gpu=index,name,...)
• ListNvidiaGPUStatuses() → NvidiaGPUStatus.Name
• Used by: GPU selection UI, live metrics labels, burn/stress test logic

Pipeline B — Benchmark results

File: audit/internal/platform/benchmark.go, line 124

• queryBenchmarkGPUInfo(selected) → benchmarkGPUInfo.Name
• Stored in BenchmarkGPUResult.Name (json:"name,omitempty")
• Used by: benchmark history table, benchmark report

Pipeline C — Hardware audit JSON (PCIe schema)

File: audit/internal/schema/hardware.go

• HardwarePCIeDevice.Model *string (field name is Model, not Name)
• For AMD GPUs: populated by audit/internal/collector/amdgpu.go from info.Product
• For NVIDIA GPUs: NOT populated by audit/internal/collector/nvidia.go — the NVIDIA enricher sets telemetry/status but skips the Model field
• Used by: hardware summary page (hwDescribeGPU in pages.go:487)

---

Key Inconsistency: NVIDIA PCIe Model is Never Set

audit/internal/collector/nvidia.go — enrichPCIeWithNVIDIAData() enriches NVIDIA PCIe devices with telemetry and status but does not populate HardwarePCIeDevice.Model.

This means:

• Hardware summary page shows "Unknown GPU" for all NVIDIA devices (falls back at pages.go:486)
• AMD GPUs do have their model populated

The fix would be: copy gpu.Name from the SAT pipeline into dev.Model inside enrichPCIeWithNVIDIAData.

---

Benchmark History "Unknown GPU" Issue

Symptom: Benchmark history table shows "GPU #N — Unknown GPU" columns instead of real GPU model names.

Root cause: BenchmarkGPUResult.Name has tag json:"name,omitempty". If queryBenchmarkGPUInfo() fails (warns at benchmark.go:126) or returns empty names, the Name field is never set and is omitted from JSON. Loaded results have empty Name → falls back to "Unknown GPU" at pages.go:2226, 2237.

This happens for:

• Older result files saved before the Name field was added
• Runs where nvidia-smi query failed before the benchmark started

---

Fallback Strings — Current State

Location	File	Fallback string
Hardware summary (PCIe)	pages.go:486	"Unknown GPU"
Benchmark report summary	benchmark_report.go:43	"Unknown GPU"
Benchmark report scorecard	benchmark_report.go:93	"Unknown" ← inconsistent
Benchmark report detail	benchmark_report.go:122	"Unknown GPU"
Benchmark history per-GPU col	pages.go:2226	"Unknown GPU"
Benchmark history parallel col	pages.go:2237	"Unknown GPU"
SAT status file write	sat.go:922	"unknown" ← lowercase, inconsistent
GPU selection API	api.go:163	"GPU N" (no "Unknown")

Rule: all UI fallbacks should use "Unknown GPU". The two outliers are benchmark_report.go:93 ("Unknown") and sat.go:922 ("unknown").

---

GPU Selection UI

File: audit/internal/webui/pages.go

• Source: GET /api/gpus → api.go → ListNvidiaGPUs() → live nvidia-smi
• Render: 'GPU N — <model> · <mem> MiB · sn: <serial>' (serial from nvidia-smi --query-gpu=...,serial; omitted when N/A)
• Single source: audit/internal/webui/gpu_picker.go — beeGpuPicker.render({...}) builds every row. All three pages (Load/SAT, Burn, Benchmark) call it from their *RenderGPUList wrapper; gpuPickerCSS/gpuPickerJS are injected once by layoutHead/renderPage.
• Serial is rendered monospace; the digits that differ across the listed GPUs (common prefix/suffix stripped) are bolded in accent colour.
• Fallback: gpu.name || 'GPU ' + idx (JS, line ~1432)

This always shows the correct model because it queries nvidia-smi live. It is not connected to benchmark result data.

---

Data Flow Summary

nvidia-smi (live)
  └─ ListNvidiaGPUs() → NvidiaGPU.Name
       ├─ GPU selection UI (always correct)
       ├─ Live metrics labels (charts_svg.go)
       └─ SAT/burn status file (sat.go)

nvidia-smi (at benchmark start)
  └─ queryBenchmarkGPUInfo() → benchmarkGPUInfo.Name
       └─ BenchmarkGPUResult.Name (json:"name,omitempty")
            ├─ Benchmark report
            └─ Benchmark history table columns

nvidia-smi / lspci (audit collection)
  └─ HardwarePCIeDevice.Model (NVIDIA: NOT populated; AMD: populated)
       └─ Hardware summary page hwDescribeGPU()

---

Fixed Issues

All previously open items are resolved:

1. NVIDIA PCIe Model — enrichPCIeWithNVIDIAData() sets dev.Model = &v (nvidia.go:78).
2. Fallback consistency — sat.go and benchmark_report.go both use "Unknown GPU".
3. tops_per_sm_per_ghz — computed in benchmark.go and stored in BenchmarkGPUScore.TOPSPerSMPerGHz.
4. MultiprocessorCount, PowerLimitW, DefaultPowerLimitW — present in benchmark_types.go.
5. Old benchmark JSONs — no fix possible for already-saved results with missing names (display-only issue).