Can't get cpu % usage from stats

Question

I am using a tool called collectd, under linux, which gives me different cpu stats. I get:

cpu user mode

cpu system mode

cpu nice

cpu idle

cpu wait

cpu interrupt

cpu softirq

cpu steal

now, I'd like to combine these stats in order to get the cpu usage %. Any idea for that?

edit: Looking at the internet it seems that I can obtain, for example, the %cpu used in user space by subtracting two successive measurements of the cpu_user_mode stat (dividing by 100,ofc). Why is that? Those values represent the time cpu spent, from the boot, in those states...why if I subtract two measurements I obtain the %?

do you want the cpu usage,or lear/know how to figurite out with these stat? — Frederic Nault, Mar 15 '14 at 13:32
figure out from these stats, as I can just have those and I need to use them to obtain a %cpu usage — Phate, Mar 15 '14 at 14:28
Ok, I dont have the solution , did you saw this post : http://stackoverflow.com/questions/3748136/how-is-cpu-usage-calculated? — Frederic Nault, Mar 15 '14 at 14:52

score 1 · Answer 1 · answered Mar 15 '14 at 13:37

1

If you want the total cpu usage there is the command i use :

top -b -d1 -n1|grep -i "Cpu(s)"|head -c21|cut -d ' ' -f3|cut -d '%' -f1

answered Mar 15 '14 at 13:37

Frederic Nault

111

Thanks but I would prefer using these stats I have, in order to make my program work with collectd – Phate Mar 15 '14 at 14:34
Perfect I was not sure – Frederic Nault Mar 15 '14 at 14:49

Can't get cpu % usage from stats

1 Answers1