Small Memory Software.pdf

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1、PrefaceSmallMemorySoftwarebyWeir,NobleAProgrammer’sIntroductiontoSmallMemorySoftware.PrefaceVersion25/04/0010:10-2Onceuponatimecomputermemorywasoneofthemostexpensivecommoditiesonearth,andlargeamountsofhumaningenuitywerespenttryingtosimulatesupernovaexplosionswithnothingmorethana

2、futureNobelprizewinnerandavastarrayofvalves.Nowadaysmanypeoplehaveenoughcomputermemorytosupportsimulatingthedestructionofmostofthegalaxyinanyoneoftheirhand-heldphones,digitaldiaries,ormicrowaveovens.Butatleasttwothingshaveremainedconstantthroughoutthehistoryofcomputing.Softwared

3、esignremainshard[Gammaetal1995],anditsfunctionalitystillexpandstofillthememoryavailable[Potter1948].Thisbookaddressesboththeseissues.Patternshaveprovedasuccessfulformattocaptureknowledgeaboutsoftwaredesign;thesepatternsinparticulartacklememoryrequirements.Asauthorswehadotherseve

4、raladditionalaimsinwritingthisbook.Aspatternsresearchersandwriterswewantedtolearnmoreaboutpatternsandpatternwriting,andassoftwaredesignersandarchitectswewantedtostudyexistingsystemstolearnfromthem.Inparticular:·Wewantedtogainandshareanin-depthknowledgeofportablesmallmemorytechni

5、ques;techniquesthatworkinmanydifferentenvironments.·Wewantedtowriteacompletesetofpatternsdealingwithonesingleforce—inthiscase,memoryrequirements.·Wewantedtostudytherelationshipsbetweenpatterns,andtogroupandorderthepatternsbasedonthesemutualrelationships,andlastly:·Wewantedanappr

6、oachablebook,onetoskimforfunratherthantosufferasapenance.Thisbookistheresult.It’swrittenforsoftwaredevelopersandarchitects,likeourselves,whetherornotyoumayhappentobefacingmemoryconstraintsinyourimmediatework.Tomakethebookmoreapproachable(andmorefuntowrite)we’vetakenalight-hearte

7、dslantinmostofourexamplesforthepatterns,andDuaneBibby’scartoonsaredelightfullyfrivolous.Iffrivolitydoesn’tappealtoyou,pleaseignorethecartoonsandtheparagraphsdescribingtheexamples:theremainingtextisasrigorousaswecanmakeit.Thisbookisstillaworkinprogress.Wehaveincorporatedthecommen

8、tsofmanypeople,andwewelcomemore.Youcancontactus