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Path: utzoo!linus!decvax!mulga!munnari!basservax!root
From: root@basservax.SUN
Newsgroups: net.unix-wizards
Subject: Re: Paging != Virtual Memory
Message-ID: <134@basservax.SUN>
Date: Fri, 2-Dec-83 18:29:13 EST
Article-I.D.: basserva.134
Posted: Fri Dec  2 18:29:13 1983
Date-Received: Sun, 4-Dec-83 04:11:31 EST
References: <13873@sri-arpa.UUCP>
Organization: Dept of C.S., University of Sydney
Lines: 13

I must agree that System V doesn't have "virtual memory".
But at least it will let you fill up your REAL memory (with
something other than operating system).

The versions 4.x of berkeley seem to want to keep 20% (or therabouts)
of real memory free, which adds up to system death with overboard
paging. Our set of active procs fit into real memory... Thus NO paging
and 25% speed improvement (at least).

Try this simple test.
	Enter vi, and then read vread(2) for about 30 seconds, and
	then type 'CR'. Now read the rest of vread(2) while waiting
	for your working set to come back...