=====Linux Process Scheduling=====

How to prioritize and deprioritize specific processes

You can influence process performance by using nice values. Nice values assign a priority to cpu resources for process

Nice values range from -20 to 19

^  -20  | highest priority |
^  0  | default priority  |
^  19  | highest priority  |

Normal users can set priorities from 0  to 19

the root can set priorities from -20 to 19

To change priorities look at lines labelled **PR** and **NI** to change a nice value press **r**

can also use the **nice** for new processes or **renice** for existing ones

example 
<code> renice -n -15 2155 </code>
the -15 is new nice value (need to be root to set it this low)

the 2155 is the process ID

to start a process with a particular priority use **nice**

<code> nice -n nice_value command </code>

you can check nice and CPU usage also with 

<code> ps -o pid,pcpu,nice,comm $(pgrep sha1sum) </code>

note shaisum is the name of the process being checked here