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From: fouts@bozeman.ingr.com (Martin Fouts)
Newsgroups: comp.arch
Subject: Re:  Me too.  (segments as good as pages)
Message-ID: <445@garth.UUCP>
Date: 9 Jun 90 00:29:48 GMT
References: <29972@cup.portal.com> <1990May14.141148.9884@xavax.com> <7754@crdgw1.crd.ge.com> <30016@cup.portal.com> <1990May19.230618.16090@utzoo.uucp> <383@garth.UUCP> <2286@crdos1.crd.ge.COM>
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In-reply-to: davidsen@crdos1.crd.ge.COM's message of 31 May 90 18:51:22 GMT




In article <2286@crdos1.crd.ge.COM> davidsen@crdos1.crd.ge.COM (Wm E Davidsen Jr) writes:

   [Anything you can do with virtual pages I can do with segments.]

True.  But the granularity is a killer, and you frequently run out of
segment descriptors a lot more quickly than you run out of page table
entries.  (I've used literally dozens of shared libraries.)

    In spite of that, I believe that 95% of all programs on all computers
    (by number rather than CPU cycles) will run in 4MB of address space.
    And probably 95% in 16MB. There are not a lot of applications which
    need the huge memory, and that means a small market, few vendors, high
    prices, etc. Adam Smith walks here, too.

maybe true.  I certainly have written a lot of small programs.  But
its the big ones that are interesting (;-)
--
Martin Fouts

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If you can find an opinion in my posting, please let me know.
I don't have opinions, only misconceptions.