John Clogg wrote:

>Not at all!  In fact, that "traditional virtual storage system" is
exactly 
>the issue.  As more and more of the data structures that are
"virtually" in 
>memory fail to fit into physical memory, more swapping must take place,
and 
>processes must wait for those swaps to complete.  When you increase
physical 
>memory the overhead of managing virtual memory goes down.  I/O is
typically 
>the bottleneck in a memory-starved system, hence my comments about
memory 
>manager I/O and page faults above.

I don't disagree at all. I contrast MPE with older batch-oriented
systems 
with little memory and copious I/O bandwidth, where high swap rates were

normal under almost all loads.

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