基于消息的分布式實(shí)時(shí)系統(tǒng)的時(shí)間記賬機(jī)制.pdf

1、重慶大學(xué)碩士學(xué)位論文基于消息的分布式實(shí)時(shí)系統(tǒng)的時(shí)間記賬機(jī)制姓名：周勁申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：計(jì)算機(jī)系統(tǒng)結(jié)構(gòu)指導(dǎo)教師：王錚20060501重慶大學(xué)碩士學(xué)位論文英文摘要IIABSTRACTReal_Timesystemistime_criticalsystemsIthasbeenappliedtomanyfieldegindustrybusinessaviationspaceflightmilitaryaffairs.Real_Timeap

2、plicationisheadingfwarddistributedsystems.Sotheresearchsonreal_timesystemsgetespeciallyimptance.Thecommunicationrulesbetweennodesarethebaseofwksappliedindistributedsystems.Asanimptantcommunicationmodebetweennodesindistri

3、butedreal_timesystemsisratherdifficulttoensurereal_timerequirementofmessagepassing.Atpresentthereal_timerequirementofthiskindofsystemsisusuallysatisfiedbyClockSynchronizationtechniquebasedonGlobalClock(GC).ThemethodofGCi

4、snotonlycomplicatedbutlimitedinapplicabilityItismerelysuitableftime_baseddistributedreal_timesystems.Fthedistributedreal_timewhichwillbewidelyappliedinfutureItisaurgentproblemtobesolvedhowtorealizereal_timeacteristicwith

5、outGC.Thedetaildiscussionmaincontributionaresummarizedasfollows:Oneabouttime_acteristicwasanalyzedinadistributedreal_timesystemsthepaperpointedthatreal_timemechanismwasrequiredtoensurereal_timedemofsystem.Twotheclocksync

6、hronizationofeachnodesindistributedrealtimesystemisimplementedthroughmessagepassing.althoughthereisnoaccdantabsolutetimeineachnodestheycouldhaveaccdantcomparativetime.accdingtothatproposeatimeaccountingschemebasedonmessa

7、ge.withoutGCweletthemessagecarrythetimerequirement(deadline)oftherealtimetasksalsoaccountthepassingtimeinmessagebythatwecanmakeguidanceontheprocessingofthemessagesufficetherealtimerequirementoftasks.thisschemeavoidthecom

8、plexityoftheclocksynchronizationmeeasiertocarryoutatthesametimeitsolvetheproblemofapplicablelimitationofGC’s.Threeprinciplerealizationoftime_accountingmechanismwereresearchedtheeticallythedistributedofthetimeelapsetomess

9、agepassinginthesystemwasanalyzed.Accdingtotheprincipleoftime_accouningthetime_accountingwaspresentedonthedelaytimeintheprocessofmessagepassingwillachievemessageprognosticationadesignideawasintroducedtoachievetime_account