introtoperformancetestingswaamtech-121018035200-phpapp01

8/13/2019 introtoperformancetestingswaamtech-121018035200-phpapp01

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By

Sajid Manzoor


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What is Performance Testing Goals of Performance Testing

Importance of Performance Testing

Types of Performance Testing

Pre-requisites of Performance Testing

Performance Management Performance Testing Cycle

Performance Testing Activities

Performance Symptoms and Issus

Typical Order of Fixes

Challenges with Performance Testing Performance Testing Best Practices

Difference Between Performance Testing and PerformanceEngineering

AGENDAOFTHEDISCUSSION


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Non-Functional testing to determine the

system responsiveness, stability, reliabilityand scalability

WHATISPERFORMANCE

TESTING??


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Access production readiness

Compare two platform to compare which performsbetter

Compare performance characteristics of systemconfigurations

Evaluate system against performance criteria

Discover what parts of the application perform

poorly and under what conditions Finding the source of performance problems

Support system tuning

PERFORMANCETESTINGGOALS


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Most users click away after 8 seconds of delay

$4.4 billion business revenue loss due to poor webapplications performance

Failure of US Based Airlines computerized system tomaintain flight plans in Nov 2009

Aberdeen found that inadequate performance couldimpact revenue by up to 9%

Business performance begins to suffer at 5.1

seconds of delay in response times of webapplications and 3.9 for critical applications

IMPORTANCEOFPERFORMANCETESTING


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An additional second of waiting on a websitesignificantly impact customer satisfaction and visitorconversions

Page viewers, conversions rate and customer

satisfaction drops 11%, 7% and16% respectively

IMPORTANCEOF

PERFORMANCETESTING


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IMPORTANCEOFPERFORMANCETESTING


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Load Testing

Stress Testing Soak/Endurance Testing

Volume/Spike Testing

Scalability Testing

Configuration Testing

TYPESOFPERFORMANCE

TESTING


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TYPESOFPERFORMANCETESTING(COND..)


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Stable build free from all major functional defects

Performance testing environment similar toproduction environment

No other testing should be performed whilePerformance testing

Conduct Performance testing before going live

Complete understanding and knowledge of theapplication

PRE-REQUISITESOFPERFORMANCETESTING


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CALLCENTERAPPLICATIONINFRASTRUCTUREEXAMPLE


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PERFORMANCE

MANAGEMENT

ProactiveApproach

ReactiveApproach

TYPESOFPERFORMANCEMANAGEMENT


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Performance Testing after the System Testing

Advantages Costeffective

Disadvantages Difficult to resolve the performance bottlenecks after the

complete development

Defect removal cost will exponentially increase

Whole system can be useless

REACTIVEAPPROACH


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PERFORMANCETESTINGCYCLE


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COREPERFORMANCETESTINGACTIVITIES

Analyze, Report and Retest

Execute Tests

Implement Test Design

Configure Test Environment

Plan and Design Tests

Identify Performance Acceptance Criteria

Identify Test Environment


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Identify Test Environment: Performance test environment should be exactreplica of production environment

Identify Performance Acceptance Criteria: Identification of performancetesting matrices and acceptable value of each matrix

Plan and Design Test: Identification of user test scenarios based on their

importance, frequency and performance impact

Configure Test Environment: Test environment setupas identified at firststep

Implement Test Design: Scriptingof user scenarios with the help of aperformance testing tool

Execute Tests: Executionof scripted user scenarios against different user

sets with different configurations Analyze, Report and Retest: Analyzethe executed tests results with

identified matrices, report results to stake holders and Retestif tests were notpassed in previous iteration

PERFORMANCETESTING

ACTIVITIES


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PERFORMANCESYMPTOMSANDISSUES

Symptoms of Web ApplicationPerformance Problems

Database Problems

Web Server Problems

Application Server problems

Network Problems


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Long user response time

Memory leaks

High CPU usage

Too many open connections

Length queues for requests

Too many table scans ofdatabase

Database deadlocks

Erroneous data returned

HTTP errors

Pages not available

WEB PPLIC TIONSPERFORM NCEPROBLEMS


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Insufficient Indexing

Fragmented Database

Out-of-date Statistics

Faulty Application Design

D T B SEPERFORM NCEPROBLEMS


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WEBSERVER

PERFORMANCE

PROBLEMS High CPU Usage

Poor Server Design

Memory Problems


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Poor Database Tuning

Poor Cache Management

Poor Session Management

Poor Security Design

APPLICATIONSERVER

PERFORMANCEPROBLEMS


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NETWORKPERFORMANCEPROBLEMS


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TYPICALORDEROFFIXES

Improve current applicationdesign (Algorithms, caching, DB

calls, memory use)

Upgrade hardware (RAM, CPU,network bandwidth)

Upgrade software infrastructure(OS, web server, database)

Upgrade system architecture (Client-serverto basic n-tier, software and hardware

changes, Use hardware load balancing /SSL


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InfrastructureSetup

Collection and Analysis of Huge Data

Identifying the Problem Root cause

Team effort required (Product vendors, Architects, Developers,

Testers, Database administrators, Network administrators) Accuracyof results

Clientinvolvement

Testing inside the firewall

Multidimensional applications (web, SAAS, mobile etc.)

Testing on Live Server Expensive

CHALLENGESWITHPERFORMANCETESTING


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Use Ramp up approach

Repeat the tests 2-3 times to confirm the results

Run tests at different times Run individual tests before combining them in a

single test

PERFORMANCETESTING

BESTPRACTICES


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