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From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.arch
Subject: Re: Very large memories
Message-ID: <7124@utzoo.UUCP>
Date: Sun, 14-Sep-86 02:29:02 EDT
Article-I.D.: utzoo.7124
Posted: Sun Sep 14 02:29:02 1986
Date-Received: Sun, 14-Sep-86 02:29:02 EDT
References: <1164@ncr-sd.UUCP> <2383@peora.UUCP>, <683@ur-tut.UUCP>
Organization: U of Toronto Zoology
Lines: 15

> >	...which means that you end up reading the whole
> >	program in anyway, and writing it out to boot. Does anyone
> >	know of a virtual memory system that doesn't work this way?
> 
> VMS.  I'm not familiar enough with vmunix schemes, but I suspect they
> provide similar provisions...  [...details...]

Yes, it's much the same in most virtual-memory Unixes.  No decent virtual-
memory implementation will insist on reading the whole thing in first,
unless perhaps the program is too small for demand paging to be sensible.
Most of the general techniques you mention can be found in any good
virtual-memory Unix.  Details and policies differ.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,decvax,pyramid}!utzoo!henry