103.6 Modify process execution priorities

Question 1

What are the ranges of nice levels or process priorities?

Answer 1

• 20: highest priority. Gets the CPU’s full attention
  0: is the default for most processes. Middle attention.
  19: lowest priority

Question 2

Which user can modify the nice level of a process to a higher priority? Who can lower the priority?

Answer 2

root or a privileged account can increase it to get more CPU time.
Any user can lower their priority to get less CPU time.

Question 3

What command and syntax is used to modify a process priority to a lower priority (less CPU time) before it gets started?

Answer 3

nice -n

Question 4

What is the difference between # nice and #renice?

Answer 4

#nice  is used to define a new nice level before an application is started
#renice is used to change the nice level or an application that is already running.

Question 5

What is the syntax for the #renice command?

Answer 5

sudo renice -n

Question 6

What key once within #top will display the processes for a specified user?

Answer 6

<u> then type the user name as prompted.</u>

Question 7

What key once within #top will change the priority for a specified process? (renice)

Answer 7

then type the PID and then the new priority as prompted.

Question 8

What is priority assignment for processes?

Answer 8

It dictates how much time the CPU grants the process.

Question 9

What do all processes need?

Answer 9

They all need CPU time.