sysmon

A terminal-based system monitor written in Go that displays CPU, memory, GPU, and process information in real-time.

Features

• Real-time CPU usage (overall and per-core)
• Memory usage statistics
• GPU usage and memory:
  • NVIDIA via nvidia-smi
  • AMD via rocm-smi
  • Apple Silicon via ioreg (no extra tools or sudo required)
• Unified-memory systems (Apple Silicon) show a single "Unified Memory" bar instead of a redundant Memory / GPU Memory split
• Top processes by CPU usage
• Clean, readable terminal interface

Requirements

• Go 1.21 or later
• Linux, macOS, or Windows (per-core CPU stats on macOS require a cgo-enabled build — see the macOS note below)
• nvidia-smi (optional, for NVIDIA GPU stats)
• rocm-smi (optional, for AMD GPU stats)
• On Apple Silicon, GPU stats work out of the box via the built-in ioreg tool

Installation

Using bin (Recommended)

bin is a lightweight binary manager that makes installing and updating sysmon easy:

# Install bin if you don't have it
curl -sSfL https://raw.githubusercontent.com/marcosnils/bin/master/install.sh | sh

# Install sysmon using bin
bin install github.com/PinePeakDigital/sysmon

After installation, sysmon will be available in your PATH (typically ~/.local/bin/ on Linux/macOS).

From Source

go mod tidy
go build -o sysmon

macOS note: per-core CPU stats require cgo (gopsutil reads them via host_processor_info). A native go build enables cgo by default, so this works out of the box. If you build with CGO_ENABLED=0, the per-core view will be empty and only aggregate CPU usage is shown.

Usage

./sysmon

Press q or Ctrl+C to exit.

Output Format

The TUI displays:

• CPU and GPU usage percentages
• Memory and GPU memory percentages (a single unified-memory bar on Apple Silicon)
• Per-core CPU usage (4 cores per line)
• Top 10 processes by CPU usage (PID, CPU%, MEM%, COMMAND)