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Understand and Use `htop` Effectively

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Updated on
Understand and Use `htop` Effectively

htop is an interactive process monitor for Linux and other Unix-like systems. It presents CPU, memory, swap, load, and process information in a navigable terminal interface.

Install and Run

Debian/Ubuntu:

sudo apt install htop

Fedora and many RHEL-family systems:

sudo dnf install htop

Then run:

htop

Read the Header

The top area typically shows:

  • CPU utilization per logical processor;
  • memory and swap use;
  • task and thread counts;
  • load averages;
  • system uptime.

Important Process Columns

Common columns include:

  • PID — process ID;
  • USER — process owner;
  • PRI / NI — priority and nice value;
  • VIRT, RES, SHR — virtual, resident, and shared memory values;
  • %CPU and %MEM — CPU and memory percentages;
  • TIME+ — accumulated CPU time;
  • Command — executable or command line.

Useful Keys

Defaults can vary, but common bindings include:

  • F3 — search;
  • F4 — filter;
  • F6 — choose a sort field;
  • F9 — send a signal to the selected process;
  • F2 — configure display fields and meters;
  • q or F10 — quit.

Read the on-screen key legend or help for the installed version.

Signals and Nice Values

When stopping a process, prefer a graceful signal such as SIGTERM before escalating to SIGKILL. Changing nice values also affects scheduling priority and may require elevated privileges.

Customize the Interface

F2 opens setup, where you can change meters, columns, tree views, colors, and other display options. htop stores its configuration in a user-specific config location.

Conclusion

htop is excellent for interactive troubleshooting. Use it to identify resource-heavy processes, inspect process trees, search and filter quickly, and send signals deliberately after understanding what a process is doing.

Linux

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