Friday, July 15, 2011

What is the difference between Simultaneous & Concurrent users ?


These are the 2 terms which is often used in Performance Testing.

Simultaneous users are the users who have a valid session in the server. Each of the users would be performing different actions like one doing login , other viewing the reports, etc.

Concurrent users are the users who have a valid session in the server & they are performing the same operation at any point of time. All the concurrent users would perform login, reports download, etc at the same point of time.

Hence for a web site, the number of simultaneous users would be always greater than the concurrent users. For example; a banking web site has the workload of about 30000 simultaneous users & 5000 concurrent users.

Knowing the correct figures of simultaneous & concurrent users is very vital in order to perform performance testing of an application.

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