Mark Perry wrote:
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Hi John,
many thanks for that excellent URL, it's an exact an answer to my
question :-)
The explanation does however lean on z/VM's algorithms as being the
potential need for Expanded storage, and the 2GB problem went away with
z/VM 5.2.
An OS that need to cache "active" working sets, only needs to do so when
it runs out of sufficient Central storage. By moving Central storage to
Expanded storage one only exacerbates the problem.
To my mind, it raises more questions.
OS/VS1 (may it long be remembered) aged unused pages through several
queues, and they could only be paged out and reclaimed after making
progress through some of those queues. This would have the same effect
as the use of timestamps.
It also assumes "more consistent performance" is preferable to "better
performance." I don't agree with that assumption.
Some of the reasons arise from not having yet fully exploited the 64-bit
architecture, or (I suspect) the ESA architecture.
Mark
John Schnitzler Jr wrote:
Here is a pretty good webpage that describes the reasons for VM's need for
expanded storage.
http://www.vm.ibm.com/perf/tips/storconf.html
John
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Cheers
John
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