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1 15 WWW 501

2

3 1 W4C WG 1 WWW (HTTP[53, 22]) WIDE WWW WIDE WWW WIDE CacheBone WG 2 WWW WG WWW W4C WG 2 WIDE CacheBone WWW 1 W4C WG:WIDE World-Wide Web Cache Working Group 503

4 2 WIDE CacheBone W4C WG HTTP WIDE CacheBone WIDE CacheBone 2.1 WIDE CacheBone WIDE CacheBone Squid[3] ICP(Internet Cache Protocol)[126] Squid WIDE CacheBone Squid Squid National Laboratory for Applied Network Research (NLANR) WWW Harvest Project Harvest Cached Harvest Cached NetCache Cached Network Appliance Squid CERN httpd (W3C httpd) fork() I/O (DNS FTP ) ICP ( ) SSL 504

5 15 WWW ICP ICP (Internet Cache Protocol) WWW RFC2186[126] ICP version 2 ICP 1. neighbor URL query 2. neighbor URL hit miss response 3. hit neighbor HTTP Squid neighbor ICP hit neighbor HTTP neighbor hit hit neighbor neighbor neighbour hit parent HTTP W4C WG WWW WWW WIDE NOC ICP NOC NOC NOC sibling NOC 2 NOC sibling

6 WIDE Aomi Kyushu-U Fukuoka Komatsu Otemachi Sapporo NCA5 KARRN Hachioji Tokyo Nezu Hiroshima Kyoto.net.com Fujisawa Nihon-U Osaka Nara AIII.org Gifu Hamamatsu.edu Sanfrancisco Sendai NOC WWW Cache Node Parent Cache Node Leaf Site Other Network 2.1: WIDE CacheBone NOC parent WG ICP sibling WWW ICP sibling parent parent 2.2 WIDE CacheBone WIDE CacheBone WWW NOC NOC NOC NOC parent

7 15 WWW WIDE WIDE CacheBone W4C WG WIDE WIDE CacheBone WWW WIDE CacheBone WIDE WIDE WWW WWW parent parent

8 3 WWW WWW 1 WWW WWW 3.1 1) 2) 508

9 15 WWW WWW 3.3 WWW Squid Squid Referer Referer URL Referer WWW Netscape Internet Explorer Referer Content-type Referer Content-type text/html text/plain Referer Referer HTML( Text)

10 WIDE Referer IP Referer Referer Referer URL Referer 3.4 Squid GET % % % 4.5%

11 15 WWW timemout=1min timeout=5min timeout=30min sec CDF (%) msec 1sec 1min 1hour page response time 3.1: timeout=1min timeout=5min timeout=30min CDF (%) the number of objects in a page 3.2: 1 3.1: % 4.4% 4.6% 39.6%

12 WIDE KBytes "object_size" page_size (timeout=1min) page_size (timeout=5min) page_size (timeout=30min) CDF (%) KB data size 1MB 3.3: / CDF (%) sec request_interval (timeout=1min) request_interval (timeout=5min) request_interval (timeout=30min) thinking_time (timeout=1min) thinking_time (timeout=5min) thinking_time (timeout=30min) msec1sec 1min 1hour request interval/thinking time 3.4:

13 15 WWW HTTP 1 10 HTTP 1 PHTTP PHTTP 1 1 HTTP 1 HTTP WWW 3.6 WWW WWW HTTP WWW

14 4 WWW WWW 1 SPEC web[6] WWW SPEC web WWW WWW WWW WWW WWW WWW WWW WWW WWW WWW 4.1 TCP WWW WWW HTTP HTTP TCP TCP HTTP HTTP TCP WWW 514

15 15 WWW 515 Client SYN_SENT SYN ( ) ESTABLISHED ack REQ SYN+ack Server listen() i LISTEN ii ( ) accept() iii ESTABLISHED accept read()... DATA write() close() CLOSE_WAIT ( ) LAST_ACK CLOSED ack FIN... FIN ack iv v vi vii FIN_WAIT_1 ( ) FIN_WAIT_2 TIME_WAIT 4.1: TCP TCP TCP [118] 1. (ISN) SYN ( 4.1 i) 2. SYN ISN+1 ack SYN ( 4.1 ii) 3. SYN ISN+1 ack ( 4.1 iii) 3 FIN FIN FIN FIN ( 4.1 iv) FIN ack( 4.1 v) FIN ( 4.1 vi) +1 ack ( 4.1 vii) TIME WAIT

16 WIDE FIN ( 4.1 iv) +1 ack( 4.1 v) FIN ( 4.1 vi) ack ( 4.1 vii) ack CLOSE WWW WWW WWW WWW WWW WWW 4.2 WWW WWW WWW 4.2 OS WWW 4.1 accept close ack 4.3 WWW WWW WWW WWW

17 15 WWW 517 server host server program user side kernel kernel side 4.2: 4.1 accept close i vii WWW HTTP TCP WWW HTTP 80 TCP SYN SYN+ack SYN+ack ack HTTP

18 WIDE BPF IP TCP 4.3: FIN FIN ack FIN FIN ack ack 1 RST RST (BPF)[88] BPF libpcap libpcap C UNIX 4.4.2

19 15 WWW 519 router server host monitor host : 4.3 BPF IP IP IP TCP ack TCP SYN FIN ACK RST Internet WWW IBM-PC CPU PentiumII 300MHz 64MBytes OS FreeBSD Release 100Mbit Ethernet Interface Card WWW Sun Enterprise Ultra SPARC 300MHz 512MBytes OS SunOS

20 WIDE 1e+07 1e+06 monitor host WWW server frequency time(sec) 4.5: 4.4 WWW WWW WWW 4.5 WWW WWW 4.5 WWW 4.6 WWW SYN+ack ack accept read HTTP request write 8/17 90% 4.7 5Kbytes OS socket buer 8KBytes socket buer write write close 4.6 WWW TCP 1 4.5KBytes

21 15 WWW 521 Client SYN ack REQ ack ack FIN SYN+ack DATA FIN ack Server accept() i ii iii read() write() close() iv v vi vii 1RTT accept 1RTT 1RTT WWW 4.6: CDF object size(bytes) 4.7:

22 WIDE number of connections time(sec) 4.8: RTT FIN 1RTT ack SYN 4RTT WWW 1RTT IP 3RTT 0.2 WWW WWW OS WWW WWW WWW WWW WWW WWW WWW

23 15 WWW number of connections time(sec) 4.9: WWW Server log Monitor log number of connections time(10minute) 4.10: 8/17

24 WIDE 4.6 WWW OS OS 4.7 TCP HTTP WWW WWW 4.8 WWW WWW WWW WWW WWW WWW

25 5 WWW 1 Harvest[32] Squid[3] sibling parent Internet Cache Protocol (ICP)[126] ICP UDP 2 1 HTTP 1 sibling parent ICP sibling ICP 1 ICP [12, 44] [21, 146, 167] ICP sibling 1 525

26 WIDE ( ) 5.1: 5.1 ICP UDP URL 20 URL 50byte 2 ICP 100byte WWW 10kbyte [167] ICP ICP sibling ICP HTTP ICP ICP ICP

27 15 WWW 527 UDP sibling HTTP HTTP ICP HTTP HTTP TCP 5.2 HTTP 3-way GET FIN 3-way 3 GET URL 50byte 1 Maximum Transmission Unit(MTU) MTU 1500byte [166] IP TCP 1460byte 10kbyte 7 ACK 3 3 FIN FINACK FIN FINACK 4 HTTP IP 18 3 delayed ack ACK

28 WIDE Client SYN ACK SYNACK Server REQ DATA... FINACK FIN FIN FINACK 5.2: HTTP ( DATA ACK ) Local Query Sibling Reply 5.3: ICP ICP ICP UDP ICP 5.3 sibling ICP ICP sibling ICP 20byte URL URL 50byte

29 15 WWW 529 WWW Server Internet Sibling Sibling Proxy Client 5.4: LAN LAN WWW sibling sibling HTTP ICP 5.5 C = C 1 ;:::;C w HTTP P HTTP P P sibling S = S 1 ;:::;S u ICP ICP sibling O HTTP sibling S 0 = S 0 1 ;:::;S0 v P S 0 sibling P sibling sibling ICP

30 WIDE S = {S1,..., Su} Sibling ICP HTTP C = {C1,..., Cw} P O Client HTTP Caching Proxy HTTP Origin Server ICP HTTP Sibling S = {S1,..., Sv } 5.5: P P HTTP P HTTP ICP T ( 1 ) P N C HTTP N 1 sibling S 0 ICP HTTP N 2 N 1 N 2 HTTP HTTP 1 N 1 R : T HTTP

31 15 WWW : HTTP C $ P (HTTP) 1 n P $ S (ICP) 1 0 p um P $ S i (HTTP) q n P $ O (HTTP) 1 0 p 0 q n p : P ( HTTP ) q : P ( HTTP ) u : P sibling n :1 HTTP m :1 ICP C HTTP HTTP n P p (1 0 p) u sibling ICP q sibling HTTP (1 0 p 0 q) HTTP ( parent) 5.1 N1 N1 = Rfn +(10 p)um + qn +(10 p 0 q)ng = Rf(2 0 p)n +(10 p)umg sibling ICP N2 P parent parent ICP HTTP P R 0 i : T sibling S 0 HTTP (i =1;:::;v) i v : P sibling p 0 : sibling S 0 (i =1;:::;v) i i

32 WIDE q 0 : sibling S 0 (i =1;:::;v) i i u 0 i k i : sibling S 0 sibling (i =1;:::;v) i : sibling S 0 P (i =1;:::;v) i A : P sibling S 0 ICP B : P sibling S 0 HTTP S 0 HTTP S 0 i R0 i p0 i i HTTP ICP u 0 sibling P i P ICP A vx A = m (1 0 p 0 i)r 0 i i=1 S 0 ICP S 0 HTTP i q0 i i P HTTP k i P HTTP B N2 vx B = n (1 0 p 0 i)r 0 q 0 k i i i i=1 N2 = A + B vx = (1 0 p 0 i)ri(m 0 + nq 0 k i i) i=1 5.4 N N = N1 + N2 = Rf(2 0 p)n +(10p)umg vx + (1 0 p 0 (m + k i )R0 i nq0 i i) i=1 P

33 15 WWW : R, R 0 i n m p 0 i q 0 i k i p : u : sibling v : sibling P R, R 0 : i n : m :ICP p 0 i, q 0 i, k i : S 0 i R R 0 10 i n m p 0 i q0 i [127] 30-50% 10% 4 p k i q0 i i P sibling sibling N N = f p +2(10 p)u +1:47vg 2 1 sibling sibling v =0 1 sibling sibling v > sibling (v =0) 4

34 WIDE 5.3: N v =0 ( 100 ) p n u sibling sibling sibling sibling 5.3 sibling sibling sibling (v >0) sibling sibling 1 sibling v sibling u sibling 5.4 v = u v =0 sibling sibling sibling sibling

35 15 WWW : N v = u ( 100 ) p n u : R p u q N1 A B N X Y Z ( 5.5) n m 18 2 sibling ICP HTTP A B q X sibling sibling % 0% 5% 10% p u N sibling 6.5% sibling % 5

36 WIDE 5.6: X( 100 ) p n u : Y( 100 ) p n u sibling 10% 6-9% Y sibling sibling 2 X 53% u % sibling % Z sibling ICP ICP 2.7% HTTP Z parent HTTP

37 15 WWW sibling X sibling sibling sibling ICP sibling sibling HTTP ICP HTTP ICP Z 1 ICP sibling ICP 5.7 parent parent ICP HTTP parent

38 WIDE 5.1 HTTP UDP 5.8 ICP ICP sibling ICP HTTP ICP 1 sibling sibling ICP ICP

39 6 WebCache WWW WWW (cache) WWW 6.1 Internet reachability Internet WWW WWW WWW ( ) ( CPU ) 6.2 WWW WWW 539

40 WIDE (locality) WWW Zipf (Zipf's law) ( Zipf ) 1 (reload) 60% 70% 20% 40% 20% 40% WWW WWW WWW (proxy server) WWW Internet

41 15 WWW 541 : Zipf's law Zipf's law (6.1) (6.1) (6.2) f 1 r (6:1) f(r) =Cr 0k (6:2) f: frequency f(r)=c*r^(-k) r: rank of objects C k k log10(c) hit rate [%] WAN LAN

42 WIDE WWW HyperText Transfer Protocol (HTTP) I/O Domain Name Service (DNS)

43 15 WWW Harvest ) 2) Internet 3) CPU 4)

44 WIDE LAN NetNews anonymous FTP Zipf's law

45 15 WWW ( 20 ) Zipf 6.4 WWW (prefetching) (replication) WWW WWW Internet 6.5 WWW WWW WWW

46 WIDE

47 7 2 WWW WWW WIDE CacheBone WWW WWW proxy [139] 6 WWW WG WWW WIDE CacheBone WIDE 1998 W4C WG ICP WWW W4C WG WWW Cache \ " WWW WIDE CacheBone WWW \ " \WWW " Web W4C WG 1998 WWW proxy WWW 547

48 WIDE

2 1: OSI OSI,,,,,,,,, 4 TCP/IP TCP/IP, TCP, IP 2,, IP, IP. IP, ICMP, TCP, UDP, TELNET, FTP, HTTP TCP IP

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