QTP Training USA

In software engineering, performance testing is in general testing performed to determine how a system performs in terms of responsiveness and stability under a particular workload. It can also serve to investigate, measure, validate or verify other quality attributes of the system, such as scalability, reliability and resource usage.
Performance testing is a subset of performance engineering, an emerging computer science practice which strives to build performance into the implementation, design and architecture of a system.
Performance testing can serve different purposes.
It can demonstrate that the system meets performance criteria.
It can compare two systems to find which performs better.
Or it can measure what parts of the system or workload causes the system to perform badly.The performance testing environment should be isolated from other environments, such as user acceptance testing (UAT) or development: otherwise the results may not be consistent. As a best practice it is always advisable to have a separate performance testing environment resembling the production environment as much as possible.
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