How to Renice a Group of Processes in Ubuntu

This article provides a clear explanation regarding process priority management in the Ubuntu Linux operating system, specifically addressing the availability of keyboard shortcuts for renicing. While users often search for a direct key combination to adjust process priorities quickly, there is no default global hotkey assigned for this function in standard Ubuntu installations. Instead, system administrators and users rely on specific terminal commands and interactive utilities to renice individual processes or groups effectively.

There is no single key combination that allows you to renice a group of processes globally across the Ubuntu desktop environment. To achieve this, you must use the command line or a terminal-based process viewer. The most direct method for handling a group of processes is using the renice command with the appropriate flags. You will need superuser privileges to increase priority (lower nice value) for most processes.

To renice a process group via the terminal, use the following command structure:

sudo renice -n [priority] -g [group_id]

Replace [priority] with a value between -20 (highest priority) and 19 (lowest priority), and [group_id] with the actual process group ID. You can find the group ID using the ps command. For example, ps -eo pid,pgid,comm will list process IDs alongside their group IDs.

If you prefer an interactive tool, you can use the top utility. While top does not renice a whole group with one keystroke, it allows you to adjust priorities quickly using the keyboard within the application. Launch top by typing top in the terminal. Once running, press the r key. You will be prompted to enter the PID of the process you wish to renice and then the new nice value. For managing multiple processes or groups efficiently, scripting the renice command remains the most effective solution compared to searching for a non-existent global shortcut.