If you are unix guys, you know well about ‘top’ command which display very useful information about the system usage. I also used this a lot during check the system states. But, in recent, one of my customer asked me about the difference between ‘CPU states:’ field and each process’s cpu usage. He asked why it is not matched.
I tried to figure it out by check the source code, but it’s still not clear. So, I googled about ‘top’ command. Because of too simple word ‘top’, it was not easy to find the correct documentation. I struggled a few days. 😛
But, finally I found the original site, ‘http://www.unixtop.org/‘.
They explained about this with very simple but clear way. If you have any interest about this field, you can check this web site’s ‘Documentation’ section.