Choosing A Load Testing Strategy Why and How to Optimize Application Performance
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1 Choosing A Load Testing Strategy Why and How to Optimize Application Performance
2 What Is Load Testing? Systematic exposure of an application to real world, expected usage conditions before deployment Analyzes an application s quality of service Performance (response times) Scalability (throughput) Reliability (availability and functional integrity) Goals Predict application/system behavior Pinpoint/diagnose problems in an application and its underlying infrastructure Understand resource requirements for capacity planning
3 Why Load Test? Save costs by reducing the number of application failures Extra costs Problem identification + Analysis and resultion + Validation testing Cost before deployment Recovery costs Cost of data recovery + Cost of external support + Legal costs + PR costs Problem identification + Analysis and resultion + Validation testing Lower costs of the application infrastructure Inefficient application/system performance Unused system capacity * Avg cost of downtime for mission criticial applications; Source: Gartner Productivity costs Duration of outage * Number of people affected * Average % of lost productivity * Average costs of employee Cost of downtime in production Lost revenue Duration of outage * Percentage of unrecoverable business * Averager revenue per hour + Number of customer abandonment * Average revenue per customer $100k per hour *
4 When To Load Test? Architecture Load Tests Infrastructure Load Tests Component-level Stress Tests End-to-end Load & Stress Tests Internal User Internet WAN Firewall Load Balancer Web Server GUI Prototype Servlet 1 App Server EJB 1 EJB 2 App Server Database External User... Table 1 Web Server... App Server Table 2 Table n...
5 Strategies For Load Testing Manual load testing Home-grown load testing tools Open-source load testing tools Testing frameworks integrated within IDEs Web-only load testing tools Enterprise-class load testing solutions
6 Manual Load Testing Advantages Easy to setup for small numbers of users Very realistic load generation True end-user perspective on response times Easy to take use case and convert to a load test
7 Manual Load Testing - Disadvantages GO! Resource intensive Testing staff Client computers Repeatability? Coordinator Internet Testers Results Analysis? System Under Test
8 Home-Grown Load Testing Tools Advantages Very specific to application under test Results and timers are customized Usually derived from the application under test so it is going to work for sure
9 Home-Grown Load Testing Tools - Disadvantages Limited test coverage and accuracy Only test very specific functions Lack of reusability For other projects or applications Staffing specificity Only the tool developer understands the test script Poor reporting Lack of standardized reporting Reporting not adjustable to user/management needs Lack of diagnostic tools for root-cause analysis Manual analysis of log files is difficult
10 Open Source Load Testing Tools Advantages FREE* Extensible Every developer s dream come true a tool with source available so it can be customized * No cost of license or maintenance but cost of development and adaptation does exist
11 Open Source Load Testing Tools - Disadvantages May satisfy very basic needs for automated load testing eweek: The main weaknesses in these tools are their lack of advanced scripting options for testing complex applications and their often-limited reporting options. Missing high-level scripting APIs -> long scripts Often based on Java technology -> performance overhead Inaccurate emulation of a Web browser s user load Point solutions Lack application support beyond Web/HTTP Developer oriented with no recorder and Java scripting only Do not integrate in an overall testing and performance lifecycle solution
12 Testing Frameworks Load Testing Tools Microsoft Visual Studio Team Test & Eclipse TPTP Advantages FREE* Test driven development, within IDE Developers do not need to learn new tool or language Developers can also do testing Every developer s dream come true same tool for development and testing! * No cost of license or maintenance but cost of development and adaptation does exist
13 Testing Frameworks Integrated Into IDEs - Disadvantages Very developer-centric view Developer does coding, unit, load and production testing View of life cycle maps only the perspective of a developer Only offer support for either.net or J2EE Not for mission-critical, heterogenous applications Don t cover all aspects of testing and the SLC
14 Web-only Load Testing Tools Advantages Usually cheaper Lower complexity due to reduced scope
15 Web-only Load Testing Tools (IE-based) Not future proof - new tool for testing non-web applications required Additional license, training and implementation costs Existing knowledge cannot be reused Typical limitations for testing Web applications Scalability and accuracy Browser compatibility Reusability No component testing
16 Enterprise-Class Load Testing Solutions Advantages More than just a capture/playback tool for Web apps Support load testing heterogenous application environments High scalability levels with reasonable costs Rapid test design and problem diagnostics Integrated into a holistic software quality optimization solution Complementary tools that cover the complete SLC Test managment Developer oriented (unit) testing Network performance/readiness testing End-user experience monitoring Training and consulting services to ensure succesful implementation
17 Importance of Accurate User Emulation Without cache 200% HTTP hits on server 150% 100% 50% 0% 0% Cache not emulating conditional requests 25% 50% 75% 100% Accurate user emulation Real user Percentage of users who visit Web site more than once
18 Enterprise-Class Load Testing Solutions Disadvantages Usually more expensive Higher complexity due to increased scope Annual maintenance charges (AMC) May need consultancy and training Have to deal with sales people!
19 Leverage All The Benefits Of Load Testing Through Viewing Quality Holistically Across The Entire SLC Testing does NOT equal Quality Quality must be a part of every stage Design Design Develop Test Deploy Manage Manage Benchmarking Pre-Deployment Go Live Go Live Production Production Component-stress testing Architecture tests End-user experience Performance regression testing monitoring Application tuning Service-level/acceptance testing System tuning Capacity tests/planning
20 View Quality Assurance as Production Engineering
21 Which Strategy To Choose? Each strategy has its advantages and disadvantages But any of them are better than manual testing! Non-critical applications that require only very little testing Open source or home-grown tools Small projects where developers do the testing Testing frameworks integrated into IDEs Mission-critical applications Enterprise-class load testing with full life-cycle support
22 How To Justify What You Need Track true costs and recognize the risk Manual efforts; missed performance issues and defects Spread the costs across multiple projects Testing is important for all software projects An enterprise solution can be used across many different technologies, software applications and environments Start modestly and grow Even a small number of virtual users, used early in the development process, usually pays off Entry-level solutions - look at the upgrade path Choose a solution that provides measurable value Metrics that document quality levels on a regular basis Load test management
23 Thank You! Q&A Rohit Gupta
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