On Mon, 26 Mar 2001, David Douthitt wrote:
> Jack Coates wrote:
>
> > This got me thinking -- does LRP have a disk cache? And if so, why?
> > Caching one hunk of system RAM in another is not sensible.
>
> Why not? As I understand HP-UX, "swap" involves swapping files to
> buffers in memory (first anyway) - so that ZERO swapping is normal. Of
> course, when you measure memory in Gigabytes instead of Megabytes, it
> may be a little different :-)
"swap" is a technique for trading access speed for a larger address space.
"disk buffering" is a technique for speeding up access to files.
They are different subsystems, so their rationale for use is different,
regardless of the amount of memory available.
If LRP cached the blocks it read from files on the ramdisk in "disk
buffers", that would be a duplication of use of that memory. Fortunately,
that does not appear to be the case.
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