Load Runner Consists Of

Published on January 2017 | Categories: Documents | Downloads: 45 | Comments: 0 | Views: 206
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Loadrunner
HP LoadRunner is an automated performance and testing product from Hewlett-Packard for examining system behaviour and performance, while generating actual load

LoadRunner consists of: 1. Virtual User Generator (VUGen): We can emulate the real world user behavior using VuGen that’s why the name virtual user [Dictionary meaning: Existing or resulting in essence or effect though not in actual fact, form, or name]. This is the place where we record and write automated scripts. 2. Controller: Here we run the scripts generated above. This controls the various load generators* and scenarios** associated with them. 3. Analysis: This gives the detailed results and presents them beautifully using reports, charts and graphics. This was just a brief overview. We will talk in details on the three parts of LR in the coming posts. *Load generators: Machines used to generate load on the server. **Scenarios: This describes aspects like which scripts will run, no of virtual users and association of load generators with scripts

LoadRunner over manual performance testing: 1. LoadRunner reduces the human resource requirement by replacing real human users with virtual users known as Vusers. Vusers emulate the real user behavior and operate the application in real. 2. LoadRunner reduces the hardware requirements by running multiple Vusers in a single computer. 3. All Vusers can be controlled from a single computer. It makes the performance testing easy and effective. 4. Using LoadRunner, we can monitor the application under testing online – we can fine tune the application during the performance test execution. 5. LoadRunner automatically records performance of application under test. LoadRunner provides lot of graph and reporting options for the analysis of performance test results. 6. Various kinds of delays can be identified using LoadRunner. During the test execution, LoadRunner monitors network and server resources continuously. 7. LoadRunner makes performance regression testing very easy – LoadRunner tests are fully automated.

Advantages: 1. No need to install it on the server under test. It uses native monitors. For Ex: perfmon for windows or rstatd daemon for Unix 2. 3. Uses ANSI C as the default programming language1 and other languages like Java and VB. Excellent monitoring and analysis interface where you can see reports in easy to understand colored charts and graphics. 4. 5. 6. Supports most of the protocols2. Makes correlation3 much easier. We will dig into correlation through a series of posts later. Nice GUI generated script through a one click recording, of course you would need to modify the script according to your needs. 7. Excellent tutorials, exhaustive documentation and active tool support from HP.

Disadvantages: The only disadvantage I can think is the prohibitive cost associated with the tool but that can also be compensated in the long run when you start getting a good ROI from the tool.
1Programming/Scripting

language is used to represent the captured protocol data and manipulate the data for play-

back.
2Protocol

is simply a language that your client uses to communicate with the system. is a way to substitute values in dynamic data to enable successful playback.

3Correlation

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