performance

[vaman]

In hpux 11 .0 What will be your action point , if you found CPU usage is too high

[John Poff]

Hi,

It all depends on your definition of too high.

JP

[Martin Johnson]

It is not so much the CPU utilization usage that worries me, it's the run queue length. CPU utilization can be at 100%, but if the run queue is at 0, it is fine. I'm getting the best bang for my buck.

Run queue is the number of jobs that are waiting to use a CPU. That waiting adds to response time, which is a bad thing.

HTH
Marty

[Henry Chua]

Interesting.. but what is the command that checks the "queue lenght"

[Hein van den Heuvel]

uptime (as a crude starting point).

ps -ef ... to see which process is collecting cpu.

top to see which process is collecting cpu.

application knowledge/common-sense to understand what that process might be doing.

process coverage analyzer to see where the busy process is burning time (prospect,...)

truss, to see which system calls are involved.

Hein.

[Bharat Katkar · Accepted solution]

HI Vaman,
It doesn't mean that system is performing bad if CPU utilisation is high on the other hand it is good to see them utilised to their capacity but what matters is the run queue as already said by martin.
You can go thr' sar -q output to monitor the same.
As far as performance is concerned find attached the doc which talks about tuning the System for Best Performance and the necessary attributes associated with it.

Hope that helps.
Regards,

[Bharat Katkar]

Sorry forgot to attach the doc.......here it is!!