Article View: comp.arch
Article #22323Re: Multics & Memory mapped files
From: Lewis T. Flynn
Date: Sat, 10 Feb 1990 21:06
Date: Sat, 10 Feb 1990 21:06
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1381 bytes
In article <5684@blake.acs.washington.edu> mrc@Tomobiki-Cho.CAC.Washington.EDU (Mark Crispin) writes: > >Furthermore, I hope that no one would implement file/memory mapping >that only mapped the entire file in. You should be able to map n >"pages" or "segments" from "page"/"segment" i of source to >"page"/"segment" j of destination. [ and a further discussion and detailed example.] Another example is KeyKOS where the maximum segment is 2**47 pages (2**59 bytes) and the user could map into his address space any portion at any location. This in an implementation on a harware architecture which only allowed physical segments and address spaces of 2**24 bytes. Terry disclaimer: I have no idea what Amdahl's views are.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!amdahl!terry From: terry@uts.amdahl.com (Lewis T. Flynn) Newsgroups: comp.arch Subject: Re: Multics & Memory mapped files Message-ID: <70Si02OM87QV01@amdahl.uts.amdahl.com> Date: 10 Feb 90 21:06:21 GMT References: <8859@portia.Stanford.EDU> <20571@watdragon.waterloo.edu> <49956@sgi.sgi.com> <4791@helios.ee.lbl.gov> <2093@crdos1.crd.ge.COM> <1990Feb7.221800.804@utzoo.uucp> <2106@crdos1.crd.ge.COM> <5180@crdgw1.crd.ge.com> <5684@blake.acs.washington.edu> Reply-To: terry@amdahl.uts.amdahl.com (Lewis T. Flynn) Organization: Amdahl Corporation, Sunnyvale CA Lines: 17