[oclug] TOP interpretation
dgerow at afflictions.org
Fri Jun 26 12:33:10 EDT 2009
: Further to my last message, I'm trying to figure out the significance
: of the various CPU numbers in TOP on my CentOS 5.x server...
: > Cpu(s): 0.3%us, 0.0%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
: What does 99.7%id mean?
%us = user
%sy = system
%ni = nice
%id = idle
%wa = wait
%hi = ?
%si = system interrupts?
%st = ?
I've never seen those last three, but it's been a few years since I bothered
with 'top' in Linux. System performance is a notoriously difficult thing to
measure and understand...
user = amount of time the system is running userland code
system = amount of time the system is running kernel code
nice = I've never really understood this one
idle = amount of time the system is doing nothing
wait = amount of time the system is waiting for available CPU cycles
Or something like that.
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