Anne & Lynn Wheeler wrote:
As part of my resource manager shipped in the mid-70s ... I had also
shipped page "migration" support (pages that became inactive on
"higher speed" devices would be migrated to "lower speed" devices)
.... improving effectiveness of higher speed devices for paging operation.
re:
http://www.garlic.com/~lynn/2007e.html#59 FBA rant
for further drift ... with regard to resource manager and various
strategies supporting paging devices ...
various "resource manager" posts here ... I had originally done dynamic
adaptive resource manager for cp67 as an undergraduate in the 60s. it
was frequently referred to as "fair share" scheduler because the default
resource policy was "fair share".
http://www.garlic.com/~lynn/subtopic.html#fairshare
Most of the resource manager implementation had been dropped in the morph
from cp67 to vm370, but i then got an opportunity to reintroduce it as
independent resource manager product. The resource manager also got selected to be
the guinee pig for kernel priced software (which had still been free up until then) ...
misc. posts mentioning evolution of unbundling and charging for software
http://www.garlic.com/~lynn/subtopic.html#unbundle
not too long after I shipped the resource manager ... is when I really started
noticing significant shift in both processor speeds and real storage
sizes vis-a-vis conventional disk technology. One of the issues was real
storage sizes was starting to rival or exceed the sizes of conventional
"high-speed" paging devices. It was then when I first implemented
dynamic adaptive switching between "duplicate" and "no-duplicate"
strategies ... discussed in this post in conjunction with IRONWOOD (3880-11
controller disk cache)
http://www.garlic.com/~lynn/2007e.html#42 FBA rant
but I originally implemented for 2305 fixed-head paging drums.
Duplicate/no-duplicate
support didn't ship to customers, but saw some pretty wide deployment
internally.
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