I have a server with 12 Cores Intel XEON CPU, and 128GB RAM. The server is dedicated, not a vps.

root@xx:~# lsb_release -d
Description:    Ubuntu 14.04.3 LTS

At random times the CPU is going to 100% to all cores and even in htop i don't see a process more than 4-5%

Check this image:


Also is that a bit strange? Look at

Tasks: 1071, 33 thr; 350 running

What is the 350 running? Because when my CPU is going to 100% that number is going to 350, but when the CPU is normal it only says 2 Running

  • Are you sure your measurement is for all CPUs? Assuming hyperthreading and 12 cores 4% or so would be maxing one thread out. – Tim Brigham Nov 30 '15 at 19:28
  • How random are these occurrences, and do they correlate to either network or IO activity? See this question for a similar situation: serverfault.com/questions/294505/… – Andrew Henle Nov 30 '15 at 21:49
  • I'm using a NGINX + PHP FPM. What i understand is that if i have for example 200 concurrect connecitons all ok. if i have 201 my CPU goes to maximum.... – OhGodWhy Nov 30 '15 at 21:56
  • By the way, tried on CentOS 7.1 with exactly the same setup, same happened – OhGodWhy Nov 30 '15 at 21:59


ps -eo pcpu,pid,user,args | sort -k1 -r | head -10

This should tell you the top 10 apps/threads using your cpu resources.

  • It only shows CPU usage of 6.1-7% and only on the first 2 processes, while al lthe others are 0.... I really can't understand this – OhGodWhy Nov 30 '15 at 21:33
  • Can you paste the result in a pastebin so that we can see it? – Karina Cervantes Magaña Nov 30 '15 at 21:34

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