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WebServer

YimingHu

UniversityofCincinnati

Cincinnati,OH45221-0030

yhu@ececs.uc.edu

AshwiniNanda

IBMT.J.WatsonResearchCenter

P.O.Box218

YorktownHeights,NY10598

ashwini@watson.ibm.com

QingYang

UniversityofRhodeIsland

Kingston,RI0288

qyang@ele.uri.edu

Abstract

IBMT.J.WatsonResearchCenter.

1

1Introduction

usinghigh-bandwidthnetworkconnections. softwaretechniques,suchasavoidingUnix

2Apache,SPECweb96andWebStone

2.1TheApacheWebServer

2

ExpectedTotalFile

Throughput(Ops)SetSize(MB)

122
231
549
1069
2098
50154

100218

200309

500488

1000690

Table1:Throughputvs.FileSetSize

tothecodetoimproveitsperformance.

2.2TheSPECweb96Benchmark

measuringtheperformanceofWebservers. canhandleistheSPECweb96value. 3

ClassesFileSizesAccessFrequencies

Class00-1KB35%

Class11KB-10KB50%

Class210KB-100KB14%

Class3100KB-1MB1%

effectontheoverallserverperformance.

2.3TheWebStoneBenchmark

3ExperimentalEnvironments

configurationislistedinTable4. runtheAIX 4

Model43P-140

ServerNumberofCPUs1

MachineCPUType200MHzPPC604e

(1RS/6000)RAMSize128MB

DiskSpace2x2GB

OSAIX4.2.1

ModelPentiumPC

ClientNumberofCPUs1

MachinesCPUType133MHzPentium

(2PentiumPCs)RAMSize32MB

DiskSpace2GB

OSLinux2.0.30

Network2x100MbpsEthernet

ModelRS/60007025F50

ServerNumberofCPUs4

MachineCPUType166MHzPPC604e

(1SMP)RAMSize2GB

DiskSpace8x4.5GB

OSAIX4.2.1

ModelRS/60007025F50

ClientNumberofCPUs4

MachineCPUType166MHzPPC604e

(1SMP)RAMSize720MB

DiskSpace8x4.5GB

OSAIX4.2.1

Network2x100MbpsEthernet

5

4MeasurementResults

4.1EffectsofSystemRAMsizes

???????,wesettheusablesystemRAM

1664128020406080100120140-160

0

5001000150020002500300035004000

Throughput (ops/sec)

Throughput

Bandwidth

Server Memory Sizes (MB)

32

Bandwidth (KBs/sec)

Figure1:ApacheSPECweb96Performance

0 10 20 30
40
50
60
70
80
90
100

163264128

Server Memory Sizes (MB)

Percentage of CPU Busy Time

Figure2:ApacheCPUUtilization

6 forthesystemwith128MBofRAM. 0% 10% 20% 30%
40%
50%
60%
70%
80%
90%
100%

163264128Server Memory Sizes (MB)

Total CPU Times

I/O Interrupt

other interrupts data page fault other syscalls file system network user

Figure3:ApacheCPUbusy-timebreakdown

syscalls"portionsasshowninFigure3 theleft,includingthe systemcallthatismainlyusedbythe ???????asafilesystemoperation. 7

4.2ContextSwitchingOverhead

???????[25]nowusemulti- threadedarchitectures.

I/O Interrupt

14% other interrupts 4% other syscalls 2% incinterval 3% ethernet driver 5% select 2% other tcp/ip 2% open 3% other filesystem 2% data page fault 8% read 10% stat 2% write 20% user 23%

4.3ApacheonaSMPsystem

8 insights. user 20%

I/O Interrupt

25%
other interrupts 5% ethernet driver 8% select 4% other tcp/ip 2% other file system

1%open

2% sigaction 1% incinterval 3% stat 3% accept

6%write

14% read 6%

4.4EffectsofRequestSizes

9 0% 10% 20% 30%
40%
50%
60%
70%
80%
90%
100%
class0class1class2class3

File Classes

Total CPU Times

I/O Interrupt

other interrupts data page fault other syscalls file system network user

I/O Interrupt

15% other interrupts

3%sigaction

2% ethernet driver 3% select 4% open 4% other filesystem 3% data page fault 2% incinterval 5%quotesdbs_dbs20.pdfusesText_26