I'm pretty confused about understanding of CPU usage in a linux server...
Please see the screenshot below:
WHAT does Cpu(s): 9.1%us mean ACTUALLY?
and
WHAT does 74.7 at the ruby/deployer row mean ACTUALLY?
Thank you
-
For more general, and useful, understanding of the information you get from top, see: redbooks.ibm.com/redpapers/pdfs/redp4285.pdf– Michael MartinezMar 13, 2014 at 17:13
Add a comment
|
1 Answer
I think that you have more than one CPU on your machine.
Your process uses 74.7% of one of your CPU. But on line 3, it's a percentage of all your CPUs (0 to 100%, whatever the number of CPU you have on this machine).
If a process used 150%, it would mean this process uses 100% of one CPU and the half of a second one but on line 3, with 2 CPU, you would have 75% of use.
PS: while you execute top, you can press f and select additional info like "Last used CPU". So you could see on which CPU your processes are used.
-
It's a virtual machine having 8 cores. So you say that process is consuming 75% of one of the cores?– scaryguyMar 13, 2014 at 17:07
-
Exactly and with a simple cross multiplication you can see how it's possible. amount of one cpu used = total amount of CPU * CPUs load / 100 = 0.728 (72.8%) But obviously, all processes are not only on one process.– DjidioufMar 13, 2014 at 17:21