It's a very basic introduction of Load Runner for beginners, i explored it at my own, prepared slides & shared it with my colleagues.
What is Load Runner & why we need Performance testing etc.
Agenda What is Automation Testing Test Automation Framework Automation Test Tools Why Load Runner Architecture Load Runner Components Think Time Playback Script Failure & it`s Solution Benefits of Automation for your company
What is Automation Testing Automation Testing is the use of software to control the execution of tests, the comparison of actual outcomes to predicted outcomes, the setting up of test preconditions, and other test control and test reporting functions. Automation is the use of strategies, tools and artifacts that reduce the need of manual or human involvement or interaction in unskilled, repetitive or redundant tasks.
Need of Automation Testing Automation testing is the best way to increase the effectiveness, efficiency and coverage of your software. Automated Testing Saves Time and Money Automated Testing Improves Accuracy Automated Testing Helps Developers and Testers Automated Testing Increases Test Coverage
Automation Test Tools Tool name Produced by Latest versionLoad Runner HP 9.5IBM Rational Functional IBM Rational 22.214.171.124TesterParasoft SOAtest Parasoft 9.0Rational robot IBM Rational 2003Selenium Open source 1.0.6SilkTest Micro Focus 2010TestComplete SmartBear Software 8.2TestPartner Micro Focus 6.3Visual Studio Test Microsoft 2010ProfessionalWATIR Open source 1.6.5
Why Load Runner?1. Load Runner reduces the human resource requirement by replacing real human users with virtual users known as Vusers.2. Load Runner reduces the hardware requirements by running multiple Vusers in a single computer.3. Load Runner automatically records performance of application under test. LoadRunner provides graph and reporting options for the analysis of performance test results.4. Various kinds of delays can be identified using LoadRunner. During the test execution, LoadRunner monitors network and server resources continuously.5. Load Runner makes performance testing very easy – LoadRunner tests are fully automated, you can easily repeat them as often as you need.
What is load runner? HPs (formerly Mercurys) load/stress testing tool for web and other applications. supports a wide variety of application environments, platforms, databases and tracing of bottlenecks. Load Runner enables you to test your system under controlled and peak load conditions.
What is Performance Testing? Performance testing is an empirical, technical investigation conducted to provide stakeholders with information about the quality of the product under test with regard to speed, scalability and stability characteristics.
System Requirements Processor: CPU Type: Intel Core, Pentium, AMD or compatible Speed: 1 GHz minimum. 2 GHz or higher recommended Intel Hyper-Threading technology is not supported. Operating System: The following 32-bit Windows operating systems are supported: Windows Vista SP1 Windows XP Professional SP2 or SP3 Windows Server 2003 Standard Edition/Enterprise Edition SP2 Windows Server 2003 Standard Edition/Enterprise Edition R2 SP2 RAM: Minimum: 512 MB Recommended: 1 GB or higher
How Load Runner Works Load Runner works by creating virtual users who take the place of real users operating client software sending requests using the HTTP protocol to web servers. Requests from many virtual user clients are generated by "Load Generators" in order to create a load on various servers under test The Controller controls load test runs based on "Scenarios" invoking compiled "Scripts" and associated "Run-time Settings". (cont.)
Scripts are crafted using "Virtual user script Generator" (named "VU Gen) During runs, the status of each machine is monitored by the Controller. At the end of each run, the Controller combines its monitoring logs with logs obtained from load generators, and makes them available to the "Analysis" program, which can then create run result reports and graphs for Microsoft Word, Crystal Reports, or an HTML webpage browser.
Load Runner componentsLoad Runner primarily is a 3 stage architecture : Virtual User Generator (VUGen) Controller Analyzer
Virtual User Generator Creates virtual users Scripts Recording Play back Generation Debug Server Run VuGen Client running an application
Controller The load is tested here.The Controller has two sections Design Section - Used to design the load testing scenario Run Section - Used to monitor scenarios which are in execution.
Analyzer The executed script result is displayed in the analyzer. Analyzer section is used to observe reports and graphs, it would determine the performance of our recoded scenarios at different user load.
Think Time Think Time is the time taken by a user (usually to think ) before user takes the next action.
Script Failure Why a script fails when it was working properly earlier? It is because the dynamic values such as Cookies , Checksums , Session Ids at the backend change every time the application is used.
Solution to the script failure? Correlation is the solution to the script failure. The user parameterizes the values. For instance, the user parameterizes the session ID and use that parameter instead of the hard-coded values.
How Automation testing can bebeneficial for your company Manual testing is time-consuming or costly. In automated testing, companies can focus on improving the automated business processes. This will increase the speed and accuracy of the development and QA team’s testing process. The entire IT departments can be a higher return on investment, but also reduces a great deal of risk. Reduced test cycle time: Since automation testing tools run considerably faster than human users, this eventually leads to a considerably reduced test cycle time resulting in sustainable time savings.
Load Runner Installation Run the setup.exe file in the root directory of the installation disk. The Load Runner Setup program begins and displays the installation menu page. Load Runner Full Setup. Provides the option to install the main Load Runner features and components including the Controller, the VuGen, Analysis, and the Load Generator. Load Generator. Installs the components needed for running virtual users to generate load. Click OK and follow the on-screen instructions to install the listed software before continuing with the Load Runner installation. If you click Cancel, the installer will exit because Load Runner cannot be installed without the prerequisite software. (cont.)