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Understand the Performance Validation Tool – HP LoadRunner

Why do organizations need a tool like LoadRunner?

When a multi-user enterprise application has been implemented, no organization can think of taking the risk of failure or inefficient performance, thus affecting the efficiency of the enterprise on the one hand and damaging its reputation on the other. LoadRunner is a well-known performance verification and validation tool designed to make accurate predictions of actual performance and application behavior, thereby increasing our confidence in the reliability of the new system before it is deployed.

LoadRunner is a performance validation tool designed to quickly provide answers to questions such as:

1) Whether my application is able to handle the expected user load and more?

2) If my application is able to manage the number of transactions required by the business?

3) Whether my application is stable enough under expected and unexpected user loads?

Modus operandi of LoadRunner:

In the real-world scenario, it is not possible to create a situation involving a thousand users using a system simultaneously to test the behavior of the system under such stressful conditions. LoadRunner can create such a situation.

LoadRunner artificially simulates several thousand users (which are called Virtual Users). These artificial / digitally created users are simultaneously forced to operate on the same task, thus loading the system in a way that should be loaded by real human users in actual practice.

With LoadRunner we can simulate the situation with hundreds or thousands of artificial users and we can impose defined, consistent and repeatable loads on the system, thus emphasizing it from end to end. This way we can emulate many business processes and production conditions, which an implemented application has to meet.

Main components of LoadRunner:

Load Runner followed three main components to build and run the tests.

1) Virtual User Generator (VuGen): To capture end user business processes in automated scripts.

2) Controller: To organize, guide, manage and monitor the load.

3) Analysis: The analysis engine to view, analyze/interpret and compare the results.

Main advantages of LoadRunner:

1) Increased level of confidence in relation to the performance of the new system.

2) Reduced risk of failure of the new Multi-user system under heavy loads.

3) Provides an absolutely clear view of the end-to-end performance of the system before it goes live.

4) Check and confirm that the new application meets all the specified performance-related requirements.

5) Check and reduce problems during the product development life cycle.

6) Very simplified scripting process at the user interface level through the use of Visual Scripting Language and ActiveScreen technology.

7) Ease of analysis through the AutoCorrelation wizard that automatically digests all monitoring and diagnostic data and calculates the top five causes of performance degradation.

8) Easily integrates with the latest J2EE, Microsoft Visual Studio and Microsoft .NET environments.

9) Useful to accurately predict the scalability and capacity of the application; thereby optimizing hardware investments.

10) Higher scalability with limited hardware due to minimum requirement of CPU and memory resources per virtual user.

11) Useful for pinpointing user, code and system level problems easily and quickly.

12) Useful for minimizing the cost of defect removal through thorough application testing well in advance during the development life cycle.

13) Useful for creating efficient service level management long before services go live.

14) Useful for involving developers in performance testing efforts from the start due to the ease of using LoadRunner scripts directly in the IDE.

15) Useful in real-time performance monitoring of all system components.

16) The new feature Service Oriented Architecture (SOA) script generator wizard helps you select test aspects of SOA environments and create scripts accordingly. Useful in boundary testing, interoperability and security testing.

17) The new XML parameter support function (Extensible Markup Language), having a facility to replace the complete XML structure with a single parameter.

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