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This was referenced Jun 24, 2026
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… source (#120) ## Problem With multiple cameras the app pegged CPU (~930% / 66% system on 4 real cameras) with bursty variance and frame drops. Profiling the **live** session (macOS \`sample\`) showed the #1 consumer was ORT thread-pool **spin-wait** (\`ThreadPoolTempl::WorkerLoop\`, 10,105 leaf samples; 88 ORT worker threads) — threads busy-spinning between intermittent inference runs, **not** actual compute. insightface's SCRFD+ArcFace sessions made it worse: \`get_model()\` forwards only \`providers\`, so they ran cores-wide + spinning, bypassing the per-camera thread cap. ## Fix - **\`inference.py\`** — \`_apply_low_idle_threading()\` disables ORT intra/inter-op spinning (\`session.intra_op.allow_spinning=0\`) and forces a single sequential inter-op pool on every \`make_session()\` session (detector + pose). Pure scheduling change; identical inference results. - **\`identify.py\`** — \`_capped_insightface_sessions()\` scopes a patch of \`onnxruntime.InferenceSession.__init__\` to inject a capped, non-spinning \`SessionOptions\` during \`FaceAnalysis\` construction (the only hook insightface leaves). Guarded by a module lock since the degraded per-worker face-build path isn't otherwise serialised across camera threads. ## Results (validated) | | old | fixed | |---|---|---| | Inference pool, headless A/B (4 cams, yolo11m, all services) | 514% | **273%** | | **Real 4 cameras, full pipeline (PyCharm)** | **~930% / 66% sys** | **~411% / 29% sys** | A **2.3× reduction**, under the 30% system target, with the CPU variance gone. Live re-profile confirms \`WorkerLoop\` is eliminated from the hotspots. ## Test / scaling infrastructure (enables headless multi-camera CPU validation, no camera permission) - **\`SyntheticAdapter\`** (\`source type: synthetic\`) — procedural / image / video synthetic source that pans the scene so detection/tracking/ego all run; effective-fps telemetry (\`AUTOPTZ_SYNTH_DEBUG\`). - **\`AUTOPTZ_DB_PATH\`** — run against an isolated config profile. - **\`AUTOPTZ_SKIP_CAMERA_PREFLIGHT\`** — start the engine with no local camera (NDI/RTSP/synthetic-only or headless), instead of gating all engine start on macOS camera permission. - \`tests/test_synthetic_source.py\` (9 tests). All 1336 tests pass; ruff + mypy + selftest green. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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this is test