Evaluation of applications over an intranet
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1 Evaluation of applications over an intranet 1
2 Intranet architecture File server 2 Lan 2 10 Mbps Eth R2 50 Unix Workstation Lan 3 10 Mbps Eth File server 1 Web server 120 Windows NT clients R1 FDDI 100 Mbps Lan 5 R3 100 Windows NT clients File server 3 Lan 1 10 Mbps Eth R4 Lan 4 16 Mbps TR File server Windows NT clients 2
3 Workload analysis Intranet applications (there are different classes): 1) Corporate training: web based application 2) Access to local file system 3
4 Infrastructure hypothesis All file server and web server have a single CPU and a single disk The FDDI and the routers are very fast versus the Lan Ethernet, then they can be modelled as a simple delay, therefore they are server without queue All the other components can be modelled as queues with service time independent by the load. 4
5 User hypotheses Finite number of users An user generates a new request, after having received an answer to the previous request, after a time equal to its thinking time 85% of users is working with the local file system 15% of users is working with the Web Server 5
6 Queueing network Multiclass closed queue model, each class is charaterized by: client group, application, server client group: CLi: clients in Lan i (i: 1 to 4) application: FS for local file server access, TR for Training server: FSi: i-th NFS server (i: 1 to 4) WebS: Web Server 6
7 Class types and number of users (CL1, FS, FS1) 120 x 0.85 = 102 (CL2, FS, FS2) 50 X 0.85 = 43 (CL3, FS, FS3) 100 x 0.85 = 85 (CL4, FS, FS4) 100 x 0.85 = 85 (CL1, TR, WebS) 120 x 0.15 = 18 (CL2, TR, WebS) 50 x 0,15 = 7 (CL3, TR, WebS) 100 x 0,15 = 15 (CL4, TR, WebS) 100 x 0,15 = 15 7
8 Server types Routers: low delay, given their low latency FDDI ring: low delay, given high bandwidth CPU Disks LANs servers with load independent service time Service Demands: D i,r = V i,r x S i,r where V i,r = Visit Ratio S i,r = Service Time 8
9 QN model (CL1, FS, Fs1) (CL1, FS, Fs1) (CL2,TR, Web) (CL2, FS, Fs2) D D C L1 L2 R1 C R2 FDDI R3 D (CL1, Tr, Web) (CL2, Tr, Web) (CL4, Tr, Web) C L3 (CL3, FS, Fs3) R4 (CL1,TR, Web) (CL1,TR, Web) (CL2,TR, Web) (CL3,TR, Web) (CL4,TR, Web) C Web S D 9 (CL3, TR, Web)
10 Web server (for a training session) Avg request document size per HTTP request: 20 rqs for txt documents (2.000 bytes per doc) 100 rqs for inline images ( bytes each) (20 text pages x 5 inline/text pages) 15 rqs for other multi-media (mm) obj ( bytes each) 10
11 Web server % request for: txt documents = 20/( ) = 15 % inline images = 100/( ) = 74 % other mm obj = 15/( ) = 11 % 11
12 Web server Average document size 0.15 x x x = = bytes Note it is an average, the overhead associated to the three document sizes is different 12
13 Web server Document request arrival rate is function of the think time and of the number of users in the thinking phase (CLi, TR, Web) #Users i in thinking phase think time Max # Users i 18 per Lan 1 7 per Lan 2 15 per Lan 3 15 per Lan 4 45 sec 13
14 Web server Device service time CPU: 1 msec processing time x HTTP request Disk: We need to consider Seekrand= avg time to position at a random cylinder DiskRevTIme = time for a complete disk revolution TransferTime = BlockSize/ 10 6 x TransferRate ControllerTime = time spent at the controller for an I/O req. S d = ControllerTime +Pmiss x (SeekRand + DiskRevolutionTime/2+TransferTime) 14
15 Web server Lan hp: no fragmentation i.e. max data area 1500 bytes; hp no data overhead for HTTP request NDatagrams = MessageSize + TCPOvhd min n MTU n - IPOvhd Overhead n = TCPOvhd+Ndatagrams x (IPOvhd + FrameOvhd n ) ServiceTime n = 8 x (MessageSize + Overhead n ) 10 6 x Bandwidth 15
16 Web server Lan hp: no fragmentation i.e. max data area 1500 bytes; hp no data overhead for HTTP request Ethernet NDatagrams = = 174 Overhead n = 20 + Ndatagrams x ( ) = 6632 ServiceTime n = 8 x ( ) 10 6 x Bandwidth 16
17 Web server Lan hp: no fragmentation i.e. max data area 1500 bytes; hp no data overhead for HTTP request Token ring NDatagrams = = 174 Overhead n = 20 + Ndatagrams x ( ) = 8372 ServiceTime n = 8 x ( ) 10 6 x Bandwidth 17
18 Web server Router delay 134 msec x packet (approximated in total to 1 msec) FDDI delay with ServiceTime n = 8 x (MessageSize + Overhead n ) 10 6 x Bandwidth 18
19 Local file system File dimension 8192 bytes avg NFS request arrival rate is function of the think time and number od users in the thinking phase (CLi, FS, FSi) #Users i in thinking phase think time 102 per Lan 1 Max #Users 43 per Lan 2 i 85 per Lan 3 85 per Lan 4 10 sec 19
20 Local file system Device service time CPU: 1 msec per file request Disk: We need to consider Seekrand= avg time to position at a random cylinder DiskRevTIme = time for a complete disk revolution TransferTime = BlockSize/ 10 6 x TransferRate ControllerTime = time spent at the controller for an I/O req. N blocks to read = 8192/2048 = 4 Lan i with 8192 bytes 20
21 Throughput & response time Class Throughput Response time (req/sec) (sec) CL1, FS, FS1 10,12 0,08 CL2, FS, FS2 4,23 0,06 CL3, FS, FS3 8,44 0,08 CL4, FS, FS4 8,44 0,07 CL1, TR, WebS 0,34 8,58 CL2, TR, WebS 0,14 8,55 CL3, TR, WebS 0,28 7,96 CL4, TR, WebS 0,28 8,35 21
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