topic Re: What control the CPU usage ? in Operating System - HP-UX

What control the CPU usage ?

hangyu — Wed, 03 Jan 2007 02:57:13 GMT

In my server , some application program are running in the database , I found that some process use high CPU util ( eg. 25.2 ) , but some are using very low CPU util ( eg. 03 ) , I am strange that the program is similiar , but why have different CPU util ? what is the main reason of they have such difference ? thx.

Re: What control the CPU usage ?

Peter Godron — Wed, 03 Jan 2007 04:01:21 GMT

Hi,
without knowing the application it is diffult to say, but my first point would be to check what the program is doing. If it doing a lot of I/O, the CPU usage would be low, whereas if it doing a lot of calculations the CPU usage would be high. It just depends on when you are monitoring the process.
Amongst other things that can have an impact are process priority and whether the data is already in memory.

Re: What control the CPU usage ?

Vibhor Kumar Agarwal — Wed, 03 Jan 2007 04:14:37 GMT

It might be as the result of process swapping also, where the CPU runs various processes turn by turn.

Monitor it for a couple of minutes and you will find out how things change.