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CPU utilization by processes

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# 1  
Old 01-04-2011
CPU utilization by processes
OS is HP
Number of CPU available is 4

I am running 8 multiple parallel application processes. I observed that the application is NOT able to occupy maximum CPU. Out of 4, 2 of them are used by 89% and 11% respectively. Where as other two are always sitting idle.

Can anyone please comment on why application is not able to use full CPU capacity?

regards
# 2  
Old 01-04-2011
Are these separate processes or threads ? Do they interact at all ?
I would suggest using "tusc" to trace what they are doing ? Perhaps they are waiting on a common lock or waiting for I/O or something...
# 3  
Old 01-04-2011
What version of HP-UX?
How are you displaying CPU usage and over what period of time? (sar, glance, top, other ?).
Does "ps" show significant CPU usage all the processes?
What type of HP-UX licence do you have? (see "uname -a").
# 4  
Old 01-04-2011
What is the application? Are you sure it is multi-threaded?
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