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Would you say that paging stuff out of memory to disk is a violation
of single level store?

Nope. But I would say that that is handled "way down there" in the
plumbing, and most OS operations are unaware of the difference between
memory and disk, it's demand faulted in by some of the very low level os
primitives.

Compressed disk has been around awhile, not that I've used it.

Agreed, but that (compression) was handled by the disk controller, or os
primitives. The higher level OS functions would simply say "save this"
and hand off a bunch of bits. The controller would say "ok, done" and
compress them on the fly.

Or am I misunderstanding what's happening here... Is the balancing a
one-time operation. That is, you balance the stuff on the disk now.
However, new stuff is simply scatter loaded across available disk as it
is today.

-Walden



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