QSpiders - Simple Recording and Configuration of recording options for HP Load Runner
- 2. The LoadRunner Solution Virtual User Generator Generates load and collects test results Creates Scripts as one Single User. Compiles and displays test results with graphical and statistical tools LoadRunner Controller LoadRunner Analysis
- 3. LoadRunner Terminology • Scenarios • Using LoadRunner, you divide your application performance testing requirements into scenarios. • A scenario defines the events that occur during each testing sessions. • For example, a scenario defines and controls the number of users to emulate, the actions that they perform, and the machines on which they run their emulations. • Vusers • In a scenario, LoadRunner replaces human users with virtual users or Vusers. • When you run a scenario, Vusers emulate the actions of human users— submitting input to the server. • A scenario can contain tens, hundreds, or even thousands of Vusers. 3 Contd….
- 4. LoadRunner Terminology 4 • Vuser Scripts • The actions that a Vuser performs during the scenario are described in a Vuser script. • When you run a scenario, each Vuser executes a Vuser script. Vuser scripts include functions that measure and record the performance of the server during the scenario. • Transactions • To measure the performance of the server, you define transactions. • Transactions measure the time that it takes for the server to respond to tasks submitted by Vusers. Contd….
- 5. LoadRunner Terminology 5 • Rendezvous Points • You insert rendezvous points into Vuser scripts to emulate heavy user load on the server. • Rendezvous points instruct multiple Vusers to perform tasks at exactly the same time. • For example, to emulate peak load on the bank server, you insert a rendezvous point to instruct 100 Vusers to simultaneously deposit cash into their accounts. • Controller • You use the LoadRunner Controller to manage and maintain your scenarios. • Using the Controller, you control all the Vusers in a scenario from a single workstation. Contd….
- 6. LoadRunner Terminology 6 • Hosts • When you execute a scenario, the LoadRunner Controller distributes each Vuser in the scenario to a host. • The host is the machine that executes the Vuser script, enabling the Vuser to emulate the actions of a human user. • Performance Analysis • Vuser scripts include functions that measure and record system performance during load-testing sessions. • During a scenario run, you can monitor the network and server resources. • Following a scenario run, you can view performance analysis data in reports and graphs.
- 8. Components of LoadRunner 12.02.0 8 • VuGen (Virtual User Generator) – records Vuser Scripts that emulate the steps of real Users using the application • The Controller is an administrative center for creating, maintaining, and executing scenarios. Starts and stops load tests, and perform other Administrative tasks Contd….
- 9. Components of LoadRunner 12.02.0 9 • LR Analysis uses the load test results to create graphs and reports that are used to correlate system information and identify both bottlenecks and performance issues. • Tuning helps you quickly isolate and resolve performance bottlenecks. By adding a centralized tuning console to LoadRunner, the Mercury Tuning Module ensures that performance bottlenecks are resolved during testing, and helps you determine the optimized configuration settings for production.
- 11. LoadRunner Expert Workflow Tune System Based on Analysis Analyze System Under Load Phase 5 LoadRunner V U G E N LoadRunner C O N T R O L L E R & A N A L Y S I S Run Scenarios Phase 4 Create Scenarios Phase 3 Create Web Virtual Users Phase 2Phase 1 Plan Load Test
- 12. Plan Load Test Identify Business Critical Scenarios. Scenario means a manual work flow. Ex: Login Open an Account Logout. Estimate User Load Performance Testing requirements will give an idea of users load or the number of users using the product. This will determine the load to be used against the product in testing. Work Load: Ex: 100 user Running together. Of this 60 users book a Browse a website. 30 users search a product and 10 users buy the Product.
- 13. What is Virtual User (Vuser)? • Virtual users or Vusers emulate the steps of real users. The steps that Vusers perform are recorded in a Vuser Script.
- 14. What is VuGen (Virtual User Generator)? • VuGen records Vuser Scripts that emulate the steps of real users using the application • VuGen not only records Vuser scripts, but also runs them. Running scripts from VuGen is useful for debugging • VuGen records sessions on Windows platforms only. However, a recorded Vuser script can run on both Windows and UNIX platform.
- 15. Process of Recording Script • Record a basic script • Enhance the basic script by adding the control-flow statements and other Mercury API functions into the Script • Configure the Run-time settings • Verify that the script runs correctly, run it in stand- alone mode • Integrate into your test : a LoadRunner scenario, Performance Centre load test, Tuning module session, Business process monitor profile
- 16. VuGen What We can Do? Set up recording options Record the scripts Add Comments Insert Start and End Transactions Perform Correlation Add Checks Add C programming Statements wherever required. Insert Load Runner Functions if required. Do Parameterization. Add Rendezvous Point Create Multiple actions If required. Perform Run Time Settings
- 17. Welcome Screen - VuGen 17 Single Protocol Script Multiple Protocol Script Creates a single protocol Vuser script. This is the default option Creates a multiple protocol Vuser script. VuGen displays all of the available protocols and allows you to specify which protocols to record
- 18. Vuser Script Sections 18 • Each Vuser script contains at least three sections: • vuser_init • one or more Actions and • vuser_end. the Vuser finishes or is stopped a logoff procedurevuser_end the Vuser is in "Running" status client activityActions the Vuser is initialized (loaded) a login to a servervuser_init Is executed when...Used when recording...Script Section
- 19. VuGen Editor 19
- 20. Recording Options Whenever VUGen generates a script, the code generated is based on various configurations that can be found under the “Recording Options” – or you can press Ctrl + F7 to view the Recording Options
- 21. Recording Options 21 There are various categories of configurations like General, Correlations, Network and Data Format Extension.
- 23. 1.The HTML-based script is based on user actions, and the scripts contain functions that correspond directly to the action taken. 2.The URL-based script is based on HTTP requests sent to the server as a result of user actions
- 24. Benefits of HTML Recording Advantages of HTML Recording Reduces need to capture dynamic values - Action tag values and hidden data are NOT hardcoded - They are retrieved from memory during playback - If they are dynamic, the VUser still run Script is only as big as the business process–one step per page Disadvantages of HTML Recording - requires more memory - requires more CPU power 24
- 25. Benefits of URL Recording Advantages of URL recording -Flexibility- Support for Java Applets and ActiveX objects on the page - Ability to replay on UNIX - Scripts are more scalable than HTML scripts because they require fewer resources Disadvantages of URL recording Scripts require more correlation (nothing is retrieved from the cache) Context-sensitive checks won’t work (parser is disabled) Scripts are large (all images and frames are recorded as separate steps) 25
- 26. Difference between HTML Mode and URL Mode HTML Mode • Intuitive and easy to understand • Scripts are smaller, requests are encapsulated and easy to understand • Scalable URL Mode • Not as intuitive as the HTML scripts. • Scripts are large, containing a call to each image, css, html, etc. thus making it difficult to understand. • More scalable and effective for creating a load test 26
- 28. Does load runner understand any other language- You’ll notice that Language dropdown is disabled. A common myth is that the LoadRunner does not generate code in any other language. Another myth is that it requires a license to work in other languages. Both are false. LoadRunner decides for itself which language to use when generating the script. In almost all cases, you’ll find yourself working with C Language. For certain java applications (like Java applets) the code being generated will be in Java Script Language. VUGen will generate a script in VBScript Language only for applications developed in Visual Basic classic 28
- 29. Scripting Options “Generate fixed think time after end transaction”. This means, no matter how much a user wait, the think time generated (the delay) will be equal to value specified. The value is in seconds. Maximum number of lines in the action file refers to the maximum number of lines VUGen will generate in an action. If the script is larger, VUGen will automatically create a new action. The default is set to 60,000. The maximum value which can be specified is 65,000 This configuration helpful when dealing with a desktop application with Oracle on the backend. 29
- 30. General => Protocol Gives you an option to select and deselect any protocols you’ve selected at the start of recording (In case wrongly selected) 30
- 31. General => Code Generation: This configuration tells VUGen to find candidates for correlation at record time. If you do not wish for Automatic Correlation, then you might wish to turn off this feature 31
- 32. Correlation => Configuration: • Although automatic correlation is helpful from 5% to 10% only, yet you can select “Rules Scan” and “Automatically correlate values found”. However, if your script doesn’t play, you can consider restoring to defaults by clicking on button. 32
- 33. Correlation => Rules: • Go to Rules, and here you can see various rules VUGen is using to find correlation Parameters. You can add custom rules if you know what your application is using as parameters. However, this is an advanced use of record time settings. 33
- 34. HTTP Properties => Advanced: Reset context for each action, enabling this option instructs VUGen to reset all HTP contexts between actions to their initial state before recording, providing a clean beginning for the recording session. The option is enabled by default. You can leave the rest of configurations intact, unless required 34
- 35. Network => Port Mapping: • Go to Options (as long as you’re not using Socket level data) and select various options like SSL version or other types of Secure Socket Layer 35
- 36. Other Settings- • This option will be used in case of specific projects 36
- 37. Recording Your Application 37 • Click the Start Recording Button • For most Client / Server protocols, the following Screen opens • Recording Tool Bar (Floating Tool Bar)
- 38. Ending and Saving a Recording Session To complete the recording: • After you record a typical business process, you complete the recording session by performing the closing steps of your business process and saving the Vuser script. • Switch to the vuser_end section in the floating toolbar, and perform the log off or cleanup procedure. • Click the stop Recording button on the recording Tool Bar 38