macpow

Real-time power consumption monitor for Apple Silicon Macs (M1–M5+).

macpow reads directly from macOS hardware interfaces — IOReport, SMC, IORegistry, CoreAudio, and Mach/kernel APIs — to show per-component power draw, temperatures, frequencies, CPU utilization, and per-process energy attribution. No sudo required.

Features

• SoC breakdown — CPU (E/P cores with per-core power, utilization bars, temperatures), GPU, ANE, DRAM, GPU SRAM, Media Engine, Camera (ISP), Fabric — all from IOReport Energy Model
• CPU utilization — per-core usage % with visual bars from Mach host_processor_info
• Real frequencies — CPU and GPU MHz from DVFS voltage-states tables, not percentages
• Temperatures — per-component and per-core from SMC sensors (CPU, GPU, ANE, DRAM, SSD, Battery); adaptive key mapping for M1–M3 (Tp0*) and M4+ (Tex*/Tp1*/Tp2*)
• Memory — used/total GB via host_statistics64 Mach API
• Display — brightness estimate + IOReport SoC display controller; external display power via IOReport DISPEXT
• Keyboard — backlight brightness and estimated power via IORegistry PWM
• Battery — voltage, amperage, charge %, time remaining, temperature, drain/charge rate
• SSD — model, interconnect (Apple Fabric/PCIe), power estimation from IORegistry disk counters
• Peripherals — Thunderbolt/PCIe (IOReport measured), WiFi (signal/mode/channel), Bluetooth devices with battery levels, USB devices (speed/power/I/O counters)
• Per-process energy — dynamically-sized top processes by session energy (from proc_pid_rusage), dead process detection
• Fans — RPM and cubic power model per fan
• Collapsible tree — fold/unfold with arrows, +/- for all
• Sparkline charts — pin any resource with Space, inline 1-line history column at wide terminals
• Time-based SMA — toggle 0s/5s/10s smoothing window
• Latency control — toggle UI refresh rate: 500ms / 2s / 5s
• Mouse support — click to select rows
• JSON mode — pipe structured data for scripts and dashboards
• No sudo — runs entirely with user-level permissions

Install

With cargo

cargo install macpow

From source

git clone https://github.com/k06a/macpow.git
cd macpow
cargo build --release
./target/release/macpow

Homebrew

brew tap k06a/tap
brew install macpow

Usage

macpow                    # TUI mode (default)
macpow --json             # JSON output to stdout
macpow --interval 1000    # Set sampling interval in ms (default: 500)
macpow --dump             # Dump IOReport channel names (diagnostics)

Keybindings

All letter keys work on any keyboard layout (QWERTY, Russian, Dvorak, etc).

Architecture

Each data source runs in its own thread, updating shared metrics at its own pace. The TUI renders at the configured interval without blocking on slow sources.

+------------------+---------------------------------------------+
| Data source      | What it provides                            |
+------------------+---------------------------------------------+
| IOReport         | SoC power (Energy Model),                   |
|                  | CPU/GPU frequencies (DVFS residency)        |
| SMC              | System power (PSTR), temps, fans            |
| IORegistry       | Battery, display brightness, keyboard PWM,  |
|                  | USB devices, SSD model, disk I/O counters   |
| CoreAudio        | Volume level, mute state                    |
| Mach API         | Per-CPU utilization ticks, memory stats      |
| proc_pid_rusage  | Per-process billed energy                   |
| getifaddrs       | Network traffic byte counters               |
| system_profiler  | WiFi info, Bluetooth devices                |
| IOPMAssertions   | Power assertions, audio playback detection  |
+------------------+---------------------------------------------+

Power measurements vs estimates

Requirements

• macOS 12+ (Monterey or later)
• Apple Silicon (M1, M2, M3, M4, M5 — any variant)
• Rust 1.70+

License

MIT