Performance testing
Performance testing is an essential part of the development of, for instance, large public web sites.
Performance testing presents similar challenges as integration testing. We need a testing system that is similar to a production system in order for the performance test data to be useful to make a forecast about real production system performance.
The most commonly used performance test is load testing. With load testing, we measure, among other things, the response time of a server while the performance testing software generates synthetic requests for the server.
Apache JMeter is an example of a an open source application for measuring performance. While it's simpler than its proprietary counterparts, such as LoadRunner, JMeter ...
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