Ztop

A terminal system monitor for Windows and Linux. Displays CPU, memory, disk, network, GPU, and processes in a single screen.

Building

Requires a recent Rust toolchain.

cargo build --release

The binary is placed at target/release/ztop.

Live GPU statistics (usage, VRAM, temperature) come from:

• NVIDIA — nvml-wrapper. Cross-platform, enabled by default. Pass --no-default-features to skip it.
• AMD on Linux — /sys/class/drm/card*/device/ (gpu_busy_percent, mem_info_vram_*, hwmon/temp*_input). Requires the amdgpu driver. No extra dependency, always compiled on Linux.
• Intel and other vendors — no driver-agnostic source; fields stay N/A.

Adapter enumeration via wgpu is always enabled.

Keys

q  Esc  Ctrl-C        Quit
↑ ↓                   Move selection
PgUp  PgDn            Page up / down
Home  End             Jump to top / bottom
← →                   Scroll the name column
Mouse wheel + click   Supported

s     Cycle sort key   (CPU → memory → PID → time → name)
r     Reverse sort
t     Toggle tree view
c     Cycle category   (all → system → user → startup → other)

/     Search           Use n / N to step through matches
\     Filter           Updates as you type

F9 / k   Kill the selected process (confirms before sending)
F8       Send a signal by number (9, 15, 1, 2, …)
F7       Renice

Inside a prompt, Enter commits and Esc cancels.

Notes

• Renice currently reports N/A on both platforms. Windows uses SetPriorityClass rather than the POSIX nice scale, and the Linux side has not been wired up. The system renice command can be used as a workaround.
• Load average is hidden on Windows. The kernel does not expose one.
• GPU temperature is reported for NVIDIA (any OS, via NVML) and for AMD on Linux (via amdgpu sysfs hwmon). Intel and other vendors report N/A.
• Process CPU% follows the htop convention: 100% represents one fully utilised core, so multi-threaded processes may exceed 100%. Task Manager normalises against total system CPU, which is the source of the difference.

License

Released under the MIT License. See LICENSE for the full text.