Reducing Retrieval Latencies in the Web - Department of ...

2 downloads 15 Views 182KB Size Report
Krishnamurthy and Wills [ 1 9 ] explore the cache coherency problem, i.e., .... A variation of the same technique is evaluated by J acobson and Cao [ 1 6 ] for ..... [ 1 7] TracyKimbrel, Andrew Tomkins, R. Hugo P atterson, B rian B ershad, P ei Cao, ...
 

    "!  # $&% "!  '() *"!  '+", -*   "!  ./0 " 132,465798;: =@?97A8BCD?AE,CDF,CD8 …†CD?ACe‡Z2,CDF,ˆI4u‰‹Š ‰Z7982,FICe5Œ,‰: 2Ž GIHKJMLON9P9Q HKRPTSOUTVWSXQJZY P9HKN@[\K]^HKRZ\KH d,,d‘uLO’ ac“9q@Hpa9H„LON9\” _IR ]^`XHKNAa9]^PcbSOUedDSXNASXRP9S f„•;g—–DLON9˜I`XH fhgjik]lRZmMn a)VWS;o^olHpmXHqrSLOsutdDSXN9S;RP9S ™uo^S;N9MLOQš–DLxN9˜›tZ€,œgX;žX{;Ÿk_[ v RPwLxNA]^SMt yz;[|{;}k~Mt VWI€,kG@ ’ Lxo¡LX‚IN9Hpa9H„LON9\”uƒ¢LxPAP„ƒ \KSXQ P9 HKQ ]^aw‚I\Ka„ƒ PASXN9S;RP9SMƒ HKsZY £¥¤;¦u§r¨e¦›©xª/«3ª›¬>¦u¤;©­‹ªu®u©¯u°²±¯­³¬r¨D©xª´¤µ·¶Z¸¡ª6®·¶¹ª º-®>¸¼»eª›¤½X¸¼©„¾¯6°—¿I¯e¤;¯>®6©x¯ ¿Iª´¶ZÀW®·¸Á¶¦uÂ"ê´¬W¯D¤;©†±µ>Ã3£ÄKÅDÆ›Ç ²È É>Êp˄ÌxÍMÎOË v RZH,SxUuPA H,QLx]^R"s ]^NAHK\KP9]^S;R a@SxU›N9HKaAH„LxNA\”]^R²P9 HIφHK’²]^a>P9SjN9HKsZY \KHkP9 HIP9]^QHWo¡LxPAHKR \K]^HKaWY a9HpN9a@HKÐJ HKN9]^HKR \pH Ñ]^R† SXHKR-J HKRMNwLOLhP9`]^]lR mm3LxPAa9]lbRZa9mPAHKP9QZN9aSXYZÕ¡HXmXƒÒm ƒφ\hHpLx’†\” a9]^]^R P9HKmahÖpƒt d@  HKH NAH|Ñ PAS; N9˜3H]^LxR†]^QÔP9 ]^]^a"ajP9s S3]^N9N9HKHK\KsZPA]^Y SX\KRÒHS;×MN9o^]^H mX]^a9RMbLOa9P9PAHKHKsQ(UÓNAo¡SXLxQÔPAHKR N9\KHK]^o^HKHKah`XƒÒLORV@P"LxN9\”HK aA]^H„R LxmNA\”]^ a Lxo^N9HhLxs b²’ HK]^R m²Y aAHKs]^RP9 H"φHp’s S;Q|Lx]^RuÑ ƒ6Ø,S Ñ HK`;HKN„tZN9HK\KHpRPIa9PAY s ]^HKa,]^R sZ]l\hLxP9HkPAMLxPIP9 Hk’ HKR H”×MPAaIUÓN9S;QP9 ]^a P9HK\” RZ]lÙY HLON9HNwLOP9 HKN²o^]^Q]^PAHKsuƒd@Y aht@LxR S;P9 HKNjQHpP9 SsÒPAMLxP Ñ Lxaj×MNAa9PLxJZJ o^]lHps†]lR-SXJ HKNwLOP9]^R m†aAbaAP9HKQ a„t J N9HÚUÓHKP9\” ]^R m t ]^a,RZS Ñ ’ HK]^R m²a9PAY s ]^HKs]^RP9ZH"φHK’\KSXRPAHKÐP„ƒ@ÛcRLxsZs ]^P9]^SXRP9S²JZN9H”UÓHpP9\” ]^R mMt PA HKN9Hj]^a,LjRY Q²’MHpN SxUuS;P9 HKNIP9HK\” RZ]lÙY Hpa@P9MLOP,LxN9Hk’ HK]^R mjHKÐ LxQ]^R Hps²]lR P9 HkφHK’s S;Q|LO]lR²LxRZs|LxNAHka9J HK\K]Ü×M\„LOol^b PwLxNAmXHKPAHKsP9SjP9 ]^a HKR`]lNASXR Q HKRP„ƒkd@ Hpa9H²P9Hp\wZR ]^ÙYZHKa"]^R \Ko^Y s Hj\KS;QJ NAHKa9aA]lS;RutuLOR sJZ]lm;mXb’MLO\w˜]^R m²SOUT]^RUÓSXNAQ|LOP9]^SXR ’MHKP Ñ HKHKR-P9 H a9HKNA`XHKNAa,LxR s P9 Hk\Ko^]^HKRP9ahƒDd@ H,QLx]^Rj\KSXRP9NA]^’ Y P9]^S;R aTSOUuP9 ]^aWa9Y NA`XHKb JMLxJ HKN@LxNAHXÝD P”LxÐSXRZSXQ²b"SOUuP9 HI\„Lx\” ]^R m LxR sjJ NAH”UÓHKPA\wZ]lRZmPAHK\” R ]^ÙY HKaht Lx\K\KS;N9s ]^R mkPASPA HWY R s HKNAo^b]^R mkJ NA]^R \K]^J o^HKa„t;LxR sjP9 H,LOo^mXSXNA]^P9 Q a›Y a9HKs6ÞLI\KNA]lPA]^\„Lxo a9Y NA`XHKbjSxU P9 H@Q HKP9 Ss aDPAMLxPDMLh`;HT’ HKHKR J N9S;JMS;a9HKs²aAS,UcLxN6UÓSXNDs HhLxo^]^R m Ñ ]^P9jP9ZH@N9HKPAN9]^HK`XLxoZoßLOP9HKRZ\K]^HKa>J NASX’ o^HKQ3t LxR s S Ñ HhLx\”SXRZH"SxU>P9ZSXa9Hà×MP9ak]^RP9 H"P”LxÐSXRZSXQ²b›Þ Ljs ]^a9\KYZa9a9]^S;RSxU>P9ZH—NAHKa9Y o^PAaSOU>P9 H"J Lxa9PkLxR sSXR m;SX]^R m S;N9˜›t LxRZsP9ZH"]^s HKRP9]Ü×M\„LOP9]^SXR SxU6UÓY P9YZN9H"NAHKa9H„LON9\”3s ]^N9HK\KPA]^SXR ahƒ Ñ

á

 

  !#"$%'&$(*),+.-0/1( 2433$(*-6572"8+6 2:9!!(*=12:-?'@4-A5>B437/1)C(D5,2(*2 -65-65EGF4)CH HD(*F4-6 +1EG)C( 43F 2B-.)5$ +I&$$(&@)!4J!98HD-?+?+.-?)C5J)%/K&@4)C&+?L,(*)C$5382"JMG)C(*+?3 E,53:/N)C(O)HDJ) /P2"HQ-?R,5:-A53$-?&@5!+? 2))!+/1)C(G2"4-6(GMG)C(S; T +?2")CC"U-.8V(*4+6 2-?W!4+?9X54MY3$)CHZ -65[EG-?28"$ '%+A(\ 3$9> 22(B F424372"] 225,2-?)C57)%/R2"](*4!(\F^" F4)CH H_$5-?2*9!;P`J5a)%/2"aH  -65D3$-6(*4F42-?)C5G) /I(*4!(\F^"b-?G2) (*43F42"c2-6HD+6 25F4-?4a(\d4e$&$(*-?5F4fMa"5 5$&$%!4 -?2DM-?+?+  +6(*%3$9ˆ$D-65]2"b+?)CF +PF%F^"!E (*43F4-65‰2" +6 25F49]2):HD-65-AHD$H8;D`f2"(*Mc-.B!E[2"D2(!5HL-.B-?)C5‰) /d2"4 &$ ,4M G((*)C54)C&$(*h/142F4"-A5–24F^"$5-?v$4;7)(S]-65>@)!2"V2" )C&@( 2-65f92HDI,53 F4)CHZHD$5-?2-?4P-.F4-?243 E )J  2)c)C(*W!O2"dB-AHL-.+6!(\-.2B-.4G!53 3$-0 (*5F44d@42ŒMG45 2"J2*MG);

IšŠ™

"E 46‰ C6: 79FWŽ,8;:¹4658F>: 4@: ±¦u¶ZÀ>¸c® ›



q % F^"-65_"$%‹$45:43ZhF4F44*/+.+?9 /N)(dHZ!5,9 9,!(*E 9-?4+.3$-65ZB-.5-tlF,5!2G-6HZ&$(*) W!HD5,2O-A5:= ,` +6 25F498mtn p ; =i2a2(\-.4c2)„(*43F4D2-6HDb+A%25F4-?4J-A53F443,982"fl+?D9CB2H ,9#"$W-65„2h" (*4v‡4B2438l+?Z&$ !4a&$(\)!C(!HŽ;>u"5 !57!&$&+?-?F 2-?)C5 -?8(*- ,4e4F243 Ef2"#F$((\5!2„%F42-?WC-?2*97-? F4)CH &$!(*43> C%-A5B2„2"8hW,43> F4F44:2(*44;>=N/_]-6HD-?+6!(*-?2*9>-?:3$424F4243 EG2":l+?48-6572"#%F4F44„2h(*4#!(* &$(*h/142F4"43 ;Zg"„ +?!)(*-?2"$HY3$)C4D5)!2f/1)C(*F4Z!5,9 &$(\h/N42F4"4 $5+?4Z:: )„F4-?5,2+?9-6HD-?+6!( &$ 2B2(5‰4eC-?2B -65 &$ B2L%F4F44D2(*44;]g":2( F4- ,3(*-?W!5VB-AHD+6 2-?)C5Vh")kMc_‰$2,5!2-6 +G(*43F42-?)C5V-657!&$&+?-?F 2-?)C5Z+6 2B5F49!E 3$4&-?2b2" B-.5-tlF,5!2 q 8 —) W!(" 3 ;Prc) M‹4W,(4E2"J2( F4 B43#M 5)!2a$ B43#)C58Z(\ +[M‹)(S!+?)C%3 ; g"Z&$(*)+.HY)%/‹&$(*43$-?F42-?W!ZF F4"-658HD(*!4  +?):-65Vz !y 5?€‚zZ|1zyh|1€ ,-y &'4| !y 4ƒC z .€ 4y !yh€†4z '8m  p E[ +?2")CC" -65:2"-?F BJ2-6HDaBF +?4a!(*J3$-0 (*5,2;Pg"J3$4F4-?-?)C582)Z@ HZ 3$J-?Ma"-?F4":+A,(*! HD+?2-6HD43$-6bl+?4a")+.3#@ &$(*h/142F4"43‰/i(*)HY+?)kM 2(*2B-A,(*982)C(B ! 2B)Z/ 2f3$-?S! F4F4)C(\3!5F4#M-?2"V2h"ˆ,9 C F4))C57!53 q  )7m # p /1)C(D&$(*h/N42BF^"-65…@42ŒMG45 &$(*) e-?4‹!53Z+?) 9 M ,Œ$!53$Mc-.3$2h"ZF4+?-?5!2B;dg"-?GMG)C(SJh")kMcP2"$ 2d&$(*h/142F4"-A5DF!5 (*43F4+6 25F49„,9Z5!(*+?9 0 & E 2")C"[ED-?C5-0lF!5,2J&$!(*2G) /P2"-?R(*43F42B-.)58-?R%22(*-6$24382)D2"bF F4"-A5:h 4F42) /I2h"_&$(*h/142F4"8$, (; T F4)C)&$( 2B-.)58) /P2" F4+?-?5,2R!53‰2" B(*W!(G-?J&$(*)C&$),43#!98 -?+?+? !53#Ÿ)CHZHD(\ m  0 p ;Gg"J2(%F4- ,3(*-?W!5 -6HD+6 2-?)C5V,!42D2"$ 2b3$&$53$-65V)C5V2":F4+.-?5,2 $ „$(\)kMc-65 "$,-.2BEPF4+?-?5!2Z-65,/1)C(HZ%2-?)C5VF!5V -?2D2" (\W!4( $ G!,42-?)C5c/N)C(G&$(*h/142F4"-65;‹gc"J(*W!(B42"_&$(\43$-.F42B-.)5ˆHL)C3$4+I&$(\45!2B43#!3 9 !O422"8B(*W!(: F4F4)C$5,2D/1)C( o!'o & ) /2":2)!2h +P+6 25F49!; q  F4"-A5 F4"-?4W!437ˆ(\43F42-?)C5)%/c:s # & EP&$(*h/142F^"-65 % 'o & E˜,532":F4)CHD-A5$%2-?)C5)%/ @)!2" #'0 & ; T +?2")CC"‰2"4blC$(\4 !(* v$-?2Z3$-0 (*5,2f/N)C(c2"b4F4)C532(B F4_43 E[2h"49#4e$"-A-?2b2"D!HD 2(\53$;Pg"MG!SD )F4-6 2-?)C5D)%/ &$(*) e-.4G!53Z+6 25F49:(*43F42-?)C5 -.OF4)C5,l(HD438,9_ (\ $+ ,F 2h3$9_)%/ F%F^" &@(Š/N)(HZ!5F4mt:s # p ;•gc"8-6H_+6 2B-.)57 +?)") MD2"$ 2 2"#2h"$ 2„2h"ˆ3$)F$HD5,2#!(*]3$4+?-?W!(*43 )C52-6HD!; g"]-6HD+6 2-?)C5 3$5),2482"$ 2#(%2- ,F4)C5,2(*)!+?+?43u&$(*h/N42BF^"-65>B-.5-tlF,5!2+?9 -6HZ&$(*) W!4#542*MG)C(S7&@(Š/N)(HZ!5F4 F4)CH &$!(*43#5)!2)5+.98Mc-.2h":2" 2h( -?C",2*/N)(*M!(*3„!&$&$(\)C F4"[E‡$2f +?)„Mc-.2h":2" 5)C:5 ,Œ&$(*h/142F4"-A58F%!;

á



á

á

á



     

Ÿ 4W!(B +-?3$ 8"$W,ˆ$45&$(*)C&@)!43>B)]/i,(b/N)(DF F4"-A5>,53X&$(*h/142F4"-A57&$),+.-?F4-?4EJ$),2"7-6572h"#)C&@( 2-65 92HLL,537VF4)C5,24eC2&@(Š/1)C(H -?C5-0lF!5!2B+.9 MG)C(*B82"$!57F%F^"4:-65>)&$( 2B-A5V92HDs ,] ´HpNwÖKƒ  [ba9P9HpQ LxR .s )OSXNLxJ JZol]^\„LOP9]^SXR m;HKR HKN”LxPAHKs  [¹HKN9`;HKNkmXHKR HpNwLxPAHKs3J N9HKsZ]l\pP9]^SXR ahƒ@VWol]^HKRPWa9]^s H"S;N J NAHKs ]^\KP9]^S;R a„ƒ \pSXQ²’ ]^RMLOP9]^SXR²SOUe’ SXP96(Õ 'xÖ ™  Lx]^N9o^bo^]^Q]^PAHKsRY Q²’ HKN"SOU,JMS;a9aA]l’ZolHLO\K\KHKaAa9HKahÞ  y Y \”|Q SXNAH,Y R \pHKN9P”Lx]^RPcb|]^R J N9HKsZ]l\pP9]^SXR ahƒ a9\pN9]^J P9aImXYMLONwLORPAHKH"LxRLx\p\KHKa9akaAHKÙY HKR \KH;ƒ  I\” ]^HK`XHKaawLxQ HJ HKNcUÓS;N9QLxR \KH†LxaL-a9Y ’ aAPwLOR“  [¹]lm;R ]Ü×M\„LORPAo^b²]lQ J N9Sx`;HKaWP9 H"J HKN UÓSXNAQ|LxRZ\KH"SxU>L P9]¡LOol^bjo¡LxN9m;HKN@JMLOa9a9]^`;H\hLx\” HXƒ J Lxa9aA]^`XH"\„LO\” HXƒ +/ ol]^m;]l’ZolH@PAS²s HKo^PwLjHpR \KSs ]^R mLxRZs|\pSXQJZN9HKaAa9]^SXRuƒ  ØkLxNAs HKN,PAS—aA]^Q²Y o¡LxP9H;ƒeySs Hpo›UÓS;NTPA H"φHK’uÕ 'xÖ    

DÍMÊhÊ"#$ ÎOÍMÎ%& 

ÍMÎOË-#$ ÎOÍMÎ%&

á

g!+? “ q )CH &$!(*-?)C5:) /P)C&@( 2-65:9CB2HDa!5382h" [;10J42-?)C5]HZ!(BS!G-?3$5!2B-t/19#-?h4a2"$%2a"$

Suggest Documents