Importance of Software Load Testing

8/11/2019 Importance of Software Load Testing

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Why performance testing is

important ?

we offer the complete solution for

performance testing


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Performance & Load TestingBasics

Introduction to Performance Testing

Dierence between Performance, Load andStress Testing

Why Performance Testing?

When is it required?

What should be tested?

Performance Testing Process

Load Test conguration for a web system

Practice !uestions


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Introduction to Performance Testing

Performance testing is the "rocess of determining thes"eed or eecti#eness of a com"uter, networ$,software "rogram or de#ice%

&efore going into the details, we should understandthe factors that go#erns Performance testing'

Through"ut

(es"onse Time

Tuning

&enchmar$ing


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Throughput

)a"ability of a "roduct

to handle multi"letransactions in a gi#e"eriod%

Through"ut re"resentsthe number ofrequests*business

transactions "rocessedby the "roduct in as"ecied time duration%

+s the number ofconcurrent usersincrease, thethrough"ut increases

almost linearly with thenumber of requests% +sthere is #ery littlecongestion within the+""lication Ser#ersystem queues%


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Throughput

In the hea#y load one or Section &, as the concurrent clientload increases, through"ut remains relati#ely constant%

In Section ) -the buc$le one. one or more of the systemcom"onents ha#e become e/hausted and through"ut starts

to degrade% 0or e/am"le, the system might enter the buc$leone when the networ$ connections at the Web ser#ere/haust the limits of the networ$ ada"ter or if the requestse/ceed o"erating system limits for le handles%


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Response Time

It is equally im"ortant tond out how much timeeach of the transactionstoo$ to com"lete%

(es"onse time isdened as the delaybetween the "oint ofrequest and the rstres"onse from the"roduct%

The res"onse timeincreases "ro"ortionallyto the user load%


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Tuning

Tuning is the "rocedureby which "roduct"erformance is enhancedby setting dierent#alues to the "arametersof the "roduct, o"eratingsystem and othercom"onents%

Tuning im"ro#es the"roduct "erformance

without ha#ing to touchthe source code of the"roduct%


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Benchmarking

+ #ery well1im"ro#ed"erformance of a"roduct ma$es nobusiness sense if that"erformance doesnot match u" to thecom"etiti#e "roducts%

+ careful analysis isneeded to chal$ outthe list oftransactions to becom"ared across

"roducts so that ana""le1a""lecom"arison becomes"ossible%


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Performance Testing- Denition

The testing to e#aluate the res"onse time -s"eed.,through"ut and utiliation of system to e/ecute itsrequired functions in com"arison with dierent #ersionsof the same "roduct or a dierent com"etiti#e "roduct iscalled Performance Testing%

Performance testing is done to deri#e benchmar$numbers for the system%

2ea#y load is not a""lied to the system

Tuning is "erformed until the system under test achie#es

the e/"ected le#els of "erformance%


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Dierence betweenPerformance Load and !tress Testing

Load Testing Process of e/ercising the

system under test by feedingit the largest tas$s it cano"erate with%

)onstantly increasing theload on the system #ia

automated tools to simulatereal time scenariowith#irtual users%

"#amp$es% Testing a word "rocessor by

editing a #ery largedocument%

0or Web +""lication load isdened in terms ofconcurrent users or 2TTPconnections%


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Dierence betweenPerformance Load and !tress

Testing!tress Testing Trying to brea$ the system

under test by o#erwhelmingits resources or by ta$ingresources away from it%

Pur"ose is to ma$e sure that

the system fails and reco#ers

gracefully%"#amp$e%

Double the baseline numberfor concurrent users*2TTPconnections%

(andomly shut down andrestart "orts on the networ$switches*routers thatconnects ser#ers%


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h' Performance Testing(

The week of )eb * +,,,%2ac$ers deli#ered o#er 31&illion transactions concurrentlyto each one of these sites%

4ahoo e&ay &uy%com +maon eTrade

-ow did 'ou think the' performed (


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h' Performance Testing

Identies "roblems early on before they become costly toresol#e%

(educes de#elo"ment cycles%

Produces better quality, more scalable code%

Pre#ents re#enue and credibility loss due to "oor Web site

"erformance%

5nables intelligent "lanning for future e/"ansion%

To ensure that the system meets "erformance e/"ectationssuch as res"onse time, through"ut etc% under gi#en le#els ofload%

5/"ose bugs that do not surface in cursory testing, such asmemory management bugs, memory lea$s, buer o#er6ows,etc%


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hen is it re.uired(

Design Phase%Pages containing lots of images and multimedia forreasonable wait times% 2ea#y loads are lessim"ortant than $nowing which ty"es of contentcause slowdowns%

De/e$opment Phase%To chec$ results of indi#idual "ages and "rocesses,loo$ing for brea$ing "oints, unnecessary code andbottlenec$s%

Dep$o'ment Phase%To identify the minimum hardware and softwarerequirements for the a""lication%


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hat shou$d be tested(

igh fre.uenc' transactions%The most frequently

used transactions ha#e the "otential to im"act the"erformance of all of the other transactions if they are note7cient%

0ission 1ritica$ transactions%The more im"ortanttransactions that facilitate the core ob8ecti#es of thesystem should be included, as failure under load of these

transactions has, by denition, the greatest im"act%

Read Transactions%+t least one (5+D 9:L4 transactionshould be included, so that "erformance of suchtransactions can be dierentiated from other morecom"le/ transactions%

2pdate Transactions%+t least one u"date transactionshould be included so that "erformance of suchtransactions can be dierentiated from othertransactions%


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Performance Testing Process


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Determine the performance testing ob3ecti/es

Describe the app$ication to test using aapp$ication mode$

3% Describe the 2ardware en#ironment

;% )reate a &enchmar$ -+genda. to be recorded inPhase ;%

+% Dene what tas$s each user will "erform&% Dene -or estimate. the "ercentage of users

"er tas$%

45P$anning45P$anning


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Record

(ecord the dened testing acti#ities that will beused as a foundation for your load test scri"ts%

9ne acti#ity "er tas$ or multi"le acti#itiesde"ending on user tas$ denition

0odif'


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7irtua$ 2sers 872s9% Test :oa$s

Start' =


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0onitoring the scenario%We monitor scenario e/ecution usingthe #arious online runtime monitors%


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Load Generation

System Under Test

Benefits of Automation

Web server Databaseserver

Vuserhost

Controller manages the virtual users Analyze results with graphs and

reports

Replaces testers with virtual users

olves the resource limitations

Runs many Vusers on a few machinesAnalysis

Controller


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Too$s used forPerformance Testing

?pen !ource

9"enST+

Diesel Test

Test


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Importance of Software Load Testing

Documents

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