e18 - AD ynam icD iskSp in-dow nT echn iqu e fo rM ob ileC...

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Unformatted text preview: AD ynam icD iskSp in-dow nT echn iqu e fo rM ob ileC om pu t ing D av idP .H e lm bo ld ,D a rre llD .E .L ongandB ru ceSh errod y D epa rtm en to fC om pu terS c ien ce U n iv ers ityo fC a lifo rn ia ,San taC ru z A b stract W eadd ressth ep rob lem o fd ec id ingw h en to sp indow n th ed isko fam ob ilecom pu ter ino rd ertoex tendba t- tery life .S in ceon eo fth em o stcr it ica lresou rces in m ob ilecom pu t ingenv ironm en ts isba ttery life ,good en ergycon serva t ionm e thod scand ram a t ica lly in crea se th eu t ilityo fm ob ilesy stem s .W eu sea s im p leande f- c ien ta lgo r ithm ba sedonm ach in e lea rn ing techn iqu es tha tha sex ce llen tp er fo rm an ce inp rac t ice .O u rexp er- im en ta lresu ltsa reba sedon tracesco llec ted fromHP Csd isk s .U s ing th isda ta ,th ea lgo r ithm ou tp er- fo rm ssev era la lgo r ithm stha ta reth eo re t ica llyop t im a l inund erva r iou sw o rst-ca sea ssum p t ion s ,a sw e lla sth e b estx ed t im e-ou tstra tegy .Inpa rt icu la r ,th ea lgo- r ithm redu cesth epow ercon sum p t iono fth ed isk to abou tha lf(d ep end ingon th ed isk 'sp rop ert ies)o fth e en ergycon sum edbyaon em inu tex ed t im e-ou t .S in ce th ea lgo r ithm adap tstou sagepa ttern s ,itu sesa s lit- t lea s% o fth een ergycon sum edby th eb estx ed t im e-ou tcom pu ted in re tro sp ec t . In trodu ct ion S in ceon eo fth em a in lim ita t ion sonm ob ilecom pu t ing isba ttery life ,m in im iz ingen ergycon sum p t ion ises- sen t ia lfo rm ax im iz ing th eu t ilityo fw ire lesscom pu t ing sy stem s .A dap t iv een ergycon serva t iona lgo r ithm scan ex tend th eba ttery lifeo fpo rtab lecom pu tersbypow er- ingdow nd ev icesw h en th eya reno tn eed ed .T h ed isk d r iv e ,th ew ire lessn e tw o rk in ter face ,th ed isp lay ,and y T h isre sea rchw a ssuppo rtedby th eO ceo fN ava lR e sea rchun- d e rG ran tN{{J{andby re sea rch fund sfrom th eU n iv e r- s ityo fC a lifo rn ia ,San taC ru z . o th ere lem en tso fth em ob ilecom pu tercanb etu rn ed oo rp laced in low pow erm od estocon serv een ergy . S ev era lresea rch ershav eev encon s id ereddynam ica lly chang ing th esp eedo fth eCPU ino rd ertocon serv e en ergy [,].W eshow tha ta s im p lea lgo r ithm fo rd e- c id ingw h en topow erdow n th ed iskd r iv e isev enm o re eec t iv e in redu c ing th een ergycon sum edby th ed isk than th eb estx ed t im e-ou tva lu ecom pu ted in re tro- sp ec t . D oug lis e ta l. []show tha tth ed isk sub-sy stem on po rtab lecom pu terscon sum esam a jo rpo rt iono fth e ava ilab leen ergy (G reenaw a lt []sta tes% o rm o re ) . It isw e ll-know n tha tsp inn ing th ed iskdow nw h en it isno t inu secan sav een ergy [,,,].S in cesp in- n ing th ed iskbackup con sum esa s ign ican tam oun to f en ergy ,sp inn ing th ed iskdow n imm ed ia te lya ftereach access is lik e ly tou sem o reen ergy than issav ed .A n in te lligen tstra tegy fo rd ec id ingw h en to sp indow n th e d isk isn eed ed tom ax im izeth...
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e18 - AD ynam icD iskSp in-dow nT echn iqu e fo rM ob ileC...

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