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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!vax135!timeinc!phri!roy
From: roy@phri.UUCP (Roy Smith)
Newsgroups: net.puzzle,net.arch
Subject: Re: Out of Virtual Memory?
Message-ID: <202@phri.UUCP>
Date: Mon, 15-Apr-85 17:04:46 EST
Article-I.D.: phri.202
Posted: Mon Apr 15 17:04:46 1985
Date-Received: Wed, 17-Apr-85 01:20:18 EST
References: <1515@decwrl.UUCP> <581@ahuta.UUCP>
Followup-To: net.arch
Organization: Public Health Research Inst. (NY, NY)
Lines: 24
Xref: watmath net.puzzle:720 net.arch:1095

>                                              [...] But computer
> systems limit how much of it you can address.  For example IBM's
> MVS pre-XA uses 24 bit addressing so you can only use up to 16Mb
> of virtual memory. Which by the way, is not enough for some of our
> users. [...]

I'm not sure why this is in net.puzzle, so I'm followup-to'ing it
to net.arch, and cross-posting this there.

	I remember reading once that the biggest address size you would
ever need would be 200 bits.  The reason for this is that there are
2**200 atoms in the universe and it is absurd to want to enumerate more
things than that.  Any comments?

	BTW, Offhand I can already think of things like sparse hash
tables which might fly in the face of this argument.
-- 

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