>You assumed queue existence. Good assumption for z/OS and most other 
>systems, but has no meaning from CPU perspective.

A system without a queue has no delays.  At that point the only improvement
possible would be a faster architecture.


>Again, there are systems, where there are no such thing like DP (or they 
>are more or less similar), but those systems still have to do with CPU 
>and their workload. For example I believe there were no such gismo in 
>MS-DOS, but DOS used processor and the processor had some utilization, 
>usually between 0 and 100%.

Even Windows has a priority scheme, but that isn't really necessary for the
discussion.  If you want to be more specific then you could simply refine
the statement that systems that have priorities will have different
utilization effects.  In this cases, where no specific priority arrangement
exists, then it simply behaves as if they are all a single priority.  No
real difference in the system behavior;  only in the interaction of
competitors.

I would argue that it isn't likely that anyone posting on this forum is
doing a capacity plan for an MS-DOS based system.  

Adam

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