Summary area fields

top -v

procps-ng 3.3.17

%Cpu(s):

%Cpu(s):  3.4 us,  8.6 sy,  0.0 ni, 28.9 id, 56.9 wa,  0.0 hi,  2.2 si,  0.0 st

Describing CPU statistics are abbreviated

The 3 CPU states

• Idle
• Running in user mode
• Running in kernel mode

解釋:

us = user mode
sy = system mode
ni = the CPU spent running user space processes that have been niced (nice)
id = idle task (如果 cpu 無野做, 那會 99%)
wa = I/O waiting (reading or writing to a disk)
hi = servicing IRQs
si = servicing soft IRQs
st = steal (time given to other DomU instances)
       ( How long the virtual CPU has spent waiting for the hypervisor to service another virtual CPU )