🚀 go-pugleaf

In article <2389@auspex.auspex.com> guy@auspex.auspex.com (Guy Harris) writes:

>  OK, so which of the OSes that support working set scheduling do so
>  without having to be told by some external agent what the working set of
>  a process at some given time is?  (Do the VMS calls even tell the OS
>  that, or do they just tell it how big the working set is?)

AOS/VS and it's big brother AOS/VS-II both support working set
scheduling.  The underlying hardware (the propritary Eclipse/MV
series) supports reference/modified bits.  The native UNIX port, DG/UX
does not use working set for individual processes, but uses a global
page replacement scheme.

In AOS/VS (ans AOS/VS-II), there are a bunch of ways to tune the
working set.  The system manager can specify the minimum and maximum
of pages that can be resident at any one time on a per-user basis
(there are separate minimums/maximums for interactive and bach
processes).  Also, you can indicate in a program file or at process
creation, the minimum working set that the program needs (and also the
maximum at process creation).

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Michael Meissner, Data General.
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