(I forgot to send this yesterday, and Jim Mulder beat me to it. The only 
thing he omitted was about space-switch interrupts).

>What exactly does "x% of system time" mean? 
>Is it a pecentage of the LPAR CP capacity?

You might say it doesn't mean anything "exactly", but it does mean 
something "approximately" :-)

Approximately, total
- CPU time spent processing PER interrupts 
- CPU time spent processing space-switch interrupts 
Divide by number of online CPUs
Divide by total elapsed time since trap was enabled
Multiply by 100

It is quite inaccurate when you consider CPUs coming online and/or going 
offline, or parked logical processors, or zAAPs/zIIPs on a business class 
machine, or not dedicated processors.

Peter Relson
z/OS Core Technology Design

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