- checks if ur application meets d specified performance requirements
- checks behavior and performance of an application prior to deployment
- create real time operating simulated environments
- find bottlenecks in ur application
- obtain accurate picture of end to end system performance before gng live
- verify that new and upgraded applications meet the specified performance requirements
LOADRUNNER
- industry specific load testing tool by Hewlett Packard
- examining system behavior n performance by generatin actual load
- emulates thousands of concurrent users to put application thru real life loads while collecting info frm various servers lk web server, database server, application server, etc.
- results can be analysed in detail to explore reasons for a particular behavior
e.g. ATM-automated teller machinethere may be 1000s of ATMs and 1000s of users might be accessing them simultaneously. So we can't produce a testbed which contains 1000s of ATM machines. Instead we take a ATM simulator, a computer with loadrunner and we can generate 1000s of virtual users accessing the server simultaneously. Once activities are defined they are repeatable. Once a pblm has been debugged, the application cn be tested again on same input values and user interaction.
Loadrunner works with 3 diff tools
1. Virtual User Generator
2. Controller
3. Analyser
- Virtual User Generator is used to script the test to be performed on application under testing. The script enables a tester to make modifications in script while testing. This is done thru parametrization
- Controller runs the script. Here load generator m/cs are specified
- Analysis tool tk the results and prepare graphs which can be reviewed.
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