Go2Linux shows you how to change the priority of a Linux process
The Linux Kernel will take care of the time each process, will have to use the processor, but you can change that, by changing the priority.How to change the priority of a Linux process
When is this needed?, well usually never, but if you have a not to fast PC, and you are compiling something, and at the same time having a video conferencing, you may want to increase the priority of your video conference applications, while reducing the priority of the program compiling your software.
