Stress Test Your Linux CPU: GUI and Command‑Line Methods Explained

Why Stress Test a CPU?

Stress testing a CPU is one of the best ways to evaluate processor performance under heavy load and monitor system temperature, helping identify cooling issues before they affect stability, especially for enthusiasts planning to overclock.

Two Approaches on Linux

The article covers two methods: a graphical interface using GtkStressTesting and a command‑line approach using s‑tui together with stress .

Graphical Method – GtkStressTesting

GtkStressTesting provides preset workloads, lets you select the number of cores to stress, and displays temperature in real time. Although the project is no longer actively maintained on GitLab, it still works.

Install it via Flatpak (enable Flatpak support first): flatpak install flathub com.leinardi.gst After installation, launch the application from the system menu, grant it full system permissions, choose the test duration and the number of worker threads (e.g., 12 cores for 5 minutes), then start the test. Monitor the temperature and stop the test if it exceeds 90 °C. In the example, the peak temperature reached 85 °C.

Command‑Line Method – s‑tui and stress

Install the tools using your distribution’s package manager or pip:

Ubuntu/Debian: sudo apt install s-tui stress Arch Linux: sudo pacman -S s-tui stress Fedora/RHEL: sudo dnf install s-tui stress To get the latest version via pip: pip install s-tui --user Run s-tui to see a curses‑based UI that shows CPU frequency, load, and utilization. Use the arrow keys or mouse to navigate to “Stress options”, set the test duration in seconds, and start the stress test.

If temperatures become unsafe, press “Quit” to stop the test. The tool can also export data to a CSV file: s-tui -c To specify a custom filename, add the --csv-file flag: s-tui --csv-file Hello.csv More information about s‑tui is available on its GitHub page.

Conclusion

Both methods provide straightforward ways to evaluate CPU performance and cooling on Linux. Regular stress testing helps detect overheating or insufficient cooling early, ensuring system stability for demanding workloads.