Virtual memory compression: Difference between revisions

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===Origins===

[[Acorn Computers]]' Unix variant, [[RISC iX]], was supplied as the primary operating system for its R140 workstation released in 1989.<ref name="acornuser198912">{{cite magazine | url=https://archive.org/details/AcornUser089-Dec89/page/n67/mode/2up | magazine=Acorn User | title=Power to the People | last1=Cox | first1=James | date=December 1989 | access-date=6 September 2020 | pages=66-67,69,71}}</ref> RISC iX provided support for demand paging of compressed executable files. However, the principal motivation for providing compressed executable files was to accommodate a complete Unix system in a hard disk of relatively modest size. Compressed data was not paged out to disk under this scheme.<ref name="taunton1991">{{cite journalbook | chapter-url=https://archive.org/details/1991-proceedings-tech-conference-nashville/page/385/mode/1up | journaltitle=Proceedings of the Summer 1991 USENIX Conference, Nashville, TN, USA, June 1991 | publisher=USENIX Association | year=1991 | last1=Taunton | first1=Mark | titlechapter=Compressed Executables: An Exercise in Thinking Small | pages=385–404}}</ref><ref name="taunton1991_unix_internals">{{cite newsgroup | title=Compressed executables | date=22 January 1991 | access-date=10 October 2020 | last1=Taunton | first1=Mark | newsgroup=comp.unix.internals | message-id=[e-mail] | url=https://groups.google.com/d/msg/comp.unix.internals/mGP6CTNdfDI/4NKaA4_rIxgJ}}</ref>

Paul R. Wilson proposed compressed caching of virtual memory pages in 1990, in a paper circulated at the ACM OOPSLA/ECOOP '90 Workshop on Garbage Collection ("Some Issues and Strategies in Heap Management and Memory Hierarchies"), and appearing in ACM SIGPLAN Notices in January 1991.<ref name ="WilsonIssuesStrategies"/>

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<ref name="CaseForCompressedCaching">{{cite conference |url=https://www.usenix.org/legacy/event/usenix99/full_papers/wilson/wilson.pdf |title=The Case for Compressed Caching in Virtual Memory Systems |author-last1=Wilson |author-first1=Paul R. |author-last2=Kaplan |author-first2=Scott F. |author-last3=Smaragdakis |author-first3=Yannis |date= 1999-06-06 |conference=USENIX Annual Technical Conference |___location=Monterey, California, USA |pages=101–116}}</ref>

<ref name="SIMPSON">{{cite web |author-last=Simpson |author-first=Matthew |title=Analysis of Compression Algorithms for Program Data |date=2014 |url=http://www.ece.umd.edu/~barua/matt-compress-tr.pdf |access-date=2015-01-09 |pages=4-14}}</ref>

<ref name="RIZZO">{{cite journal |author-last=Rizzo |author-first=Luigi |title=A very fast algorithm for RAM compression |journal=ACM SIGOPS Operating Systems Review |date=1996 |volume=31 |issue=2 |url=http://dl.acm.org/citation.cfm?id=250012 |access-date=2015-01-09 |page=8|doi=10.1145/250007.250012 |s2cid=18563587 |url-access=subscription }}</ref>

<ref name="DENNING">{{cite journal |author-last=Denning |author-first=Peter J. |title=Thrashing: Its causes and prevention |journal=Proceedings AFIPS, Fall Joint Computer Conference |date=1968 |url=http://www.cs.uwaterloo.ca/~brecht/courses/702/Possible-Readings/vm-and-gc/thrashing-denning-afips-1968.pdf |access-date=2015-01-05 |page=918 |volume=33}}</ref>

<ref name="FREEDMAN">{{cite web |author-last=Freedman |author-first=Michael J. |title=The Compression Cache: Virtual Memory Compression for Handheld Computers |url=http://www.cs.princeton.edu/~mfreed//docs/6.033/compression.pdf |date=2000-03-16 |access-date=2015-01-09}}</ref>