Home > Performance Test > Performance Testing With Load Runner -3- : Load Runner and its components

Performance Testing With Load Runner -3- : Load Runner and its components

Load Runner:

HP LoadRunner, a tool for performance testing, stresses your entire application to isolate and identify potential client, network, and server bottlenecks.

HP LoadRunner load tests your application by emulating an environment in which multiple users work concurrently. While the application is under load, LoadRunner accurately measures, monitors, and analyzes a system’s performance and functionality.

How LoadRunner Addresses the Performance Testing:

  • LoadRunner reduces personnel requirements by replacing human users with virtual users or Vusers. These Vusers emulate the behavior of real users— operating real applications.
  • Because numerous Vusers can run on a single computer, LoadRunner reduces the amount of hardware required for testing.
  • The HP LoadRunner Controller allows you to easily and effectively control all the
  • Vusers—from a single point of control.
  • LoadRunner monitors the application performance online, enabling you to fine- tune

    your system during test execution.

  • LoadRunner automatically records the performance of the application during a test. You

    can choose from a wide variety of graphs and reports to view the performance data.

  • LoadRunner checks where performance delays occur: network or client delays, CPU

    performance, I/O delays, database locking, or other issues at the database server. LoadRunner monitors the network and server resources to help you improve performance.

  • Because LoadRunner tests are fully automated, you can easily repeat them as often as you need.

Various Components of LoadRunner:

Vuser Generator is the Script generation component of LoadRunner. This component has two main things and are described below:

Vusers: In the scenario, LoadRunner replaces human users with virtual users or Vusers. When you run a scenario, Vusers emulate the actions of human users working with your application. While a workstation accommodates only a single human user, many Vusers can run concurrently on a single workstation. In fact, a scenario can contain tens, hundreds, or even thousands of Vusers.

Vuser Scripts: The actions that a Vuser performs during the scenario are described in Vuser script. When you run a scenario, each Vuser executes a Vuser script. The Vuser scripts include functions that measure and record the performance of your application’s components.

Controller: You use the HP LoadRunner Controller to manage and maintain your scenarios. Using the Controller, you control all the Vusers in a scenario from a single workstation.

Load Generator: When you execute a scenario, the Controller distributes each Vuser in the scenario to a load generator. The load generator 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.

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