I am looking at the output of top.
top - 16:11:19 up 31 days, 2:37, 10 users, load average: 17.01, 16.99, 17.00
Tasks: 470 total, 18 running, 452 sleeping, 0 stopped, 0 zombie
Cpu(s): 76.5%us, 0.0%sy, 0.0%ni, 23.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Several questions about CPU usage:
(1) is "us" part in the third line same as "load average/number of cores" or something I heard people mentioned "CPU utilization"?
(2) for the us part, "man top" says
us -- User CPU time
The time the CPU has spent running users’ processes that are not niced.
What are "processes that are not niced"?
(3) some says "CPU utilization" is a better measurement than load average. So how to get "CPU utilization"? If I sum up the %CPU column for all processes, is that "CPU utilization" or something else different than "CPU utilization * number of cores" and load average?
Thanks and regards!