renice

Alter the scheduling priority/niceness of running processes. Niceness values range from -20 (most favorable to the process) to 19 (least favorable to the process). See also: nice. More information: https://manned.org/renice.

• Set the absolute priority of a running [p]rocess:

renice +3 -p pid

• Increase/decrease the priority of all processes owned by a [u]ser:

renice --relative -4 -u uid|user

• Set the priority of all processes that belong to a process [g]roup:

renice --absolute 5 -g process_group