RHCSA Rapid Track

A signal is a software interrupt that reports events to an executing program. The kill, pkill, and killall commands use signals to control processes.

Load average is an estimate of how busy the system is. To display load average values, you can use the top, uptime, or w command.

The tuned service automatically modifies device settings to meet specific system needs based on a predefined selected tuning profile.

To revert all changes of the selected profile to the system settings, either switch to another profile or deactivate the tuned service.

The system assigns a relative priority to a process to determine its CPU access. This priority is called the nice value of a process.

The nice command assigns a priority to a process when it starts.

The renice command modifies the priority of a running process.