Scalability testing, is the testing of a software application to measure its capability to scale up or scale out in terms of any of its non-functional capability. Performance, scalability and reliability testing are usually grouped together by software quality analysts.
The main goals of scalability testing are to determine the user limit for the web application and ensure end user experience, under a high load, is not compromised. One example is if a web page can be accessed in a timely fashion with a limited delay in response. Another goal is to check if the server can cope i.e. Will the server crash if it is under a heavy load?
Dependent on the application that is being tested, different parameters are tested. If a webpage is being tested, the highest possible number of simultaneous users would be tested. Also dependent on the application being tested is the attributes that are tested – these can include CPU usage, network usage or user experience.
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