Why the LoadRunner? what are the uses of Load Runner

Why load runner:

• LoadRunner reduces the 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 hardware requirements. 
• The LoadRunner Controller allows you to easily and effectively control all the Vusers--from a single point of control. 
• LoadRunner automatically records the performance of the client/server system during a test. You can choose from a wide variety of graphs and reports how you want 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. 

Uses Of LoadRunner:

Using LoadRunner, you divide your client/server performance testing requirements into scenarios.

A scenario defines the events that occur during each testing session. Thus, 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. 

In the 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. 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. 

To emulate conditions of heavy user load, you create a large number of Vusers that perform a series of tasks. For example, you can observe how a server behaves when one hundred Vusers simultaneously withdraw cash from the bank ATMs. To accomplish this, you create 100 Vusers, and each Vuser: 

• enters an account number into an ATM 
• enters the amount of cash to withdraw 
• withdraws cash from the account 
• checks the balance of the account 
• repeats the process numerous times 

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