Safety

Safety

Thresholds (HardwareBridge::check_safety)

Condition	Status
gpu_temp_c > 85	Critical
power_w > 350	Critical
Elevated temp/power approaching limits	Warn
Non-finite / unknown-power edge cases	Critical (see unit tests)
Normal range	Ok

Returns (SafetyStatus, is_simulated).

Emergency brake

• apply_emergency_brake(pct) — e.g. main loop uses 0.5 (50% power limit) via nvidia-smi -pl
• release_emergency_brake() — restore default power limit
• Apply/release run on blocking tokio tasks so the async loop is not stalled

Hysteresis (main loop)

• Safety checked every 10 steps
• After brake: require 3 consecutive real Ok readings before release
• Simulated telemetry: hold brake (do not release on fake Ok)
• Warn after release can re-trigger brake

Process safety

• Lockfile /tmp/thalamic_relay.lock with PID
• Stale lock reclaimed only if recorded PID is dead
• Unreadable lock → refuse to start (fail closed)
• Lock acquired before UDP/metrics bind

Related

• GPU Telemetry
• CLI and Configuration

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Last updated: July 29, 2026 Updated by: Grok Build: Grok 4.5 Package tip reference: e09cd4a (main) Devin DeepWiki: commit e09cd4a · thalamic-relay