Multiple thread GROUPS are provided, each of which can be set to imitate how users interact with the app, how the load is sustained, and for how long. The Arrivals Thread GROUP is the beginning of thread iteration. It defines the schedule of the load. The Concurrency Thread group is likewise appropriate for goal-oriented scenarios, but the purpose here is to manage the number of concurrent users over TIME. Freedom Arrivals Thread Group resembles the Arrivals Thread group, the difference being that this thread group does not have choices for ramp-up time and steps. The Stepping Thread Group is an older version of the Concurrency Thread Group that takes a little more configuration. The ultimate result is essentially the same; the main difference is in the ramp-up and ramp-down phases.

The ultimate thread group is highly customizable, and unlike the arrivals, freeform, and concurrency thread groups, it kills ACTIVE threads when the set time runs out. As users exit the application tab or browser, this would convert into real-world user behaviour. Because the ramp-down is controlled by the thread group rather than the execution time of individual threads, the preview GRAPH depicting the expected simultaneous users will be extremely accurate. In the case where one thread has completed execution, the thread group also starts a new thread to keep the thread count up.

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