Listeners & Timers

Let us discuss the Listeners & Timers. 

Listeners – Listeners provide access to the information JMeter gathers about the test cases while JMeter runs. The Graph Results listener plots the response times on a graph. The “View Results Tree” Listener shows details of sampler requests and responses and can display basic HTML and XML representations of the response. Other listeners provide summary or aggregation information.

Additionally, listeners can direct the data to a file for later use. Every listener in JMeter provides a field to indicate the file to store data to. There is also a Configuration button which can be used to choose which fields to save, and whether to use CSV or XML format. Note that all Listeners save the same data; the only difference is in the way the data is presented on the screen.

Listeners can be added anywhere in the test, including directly under the test plan. They will collect data only from elements at or below their level. There are several listeners that come with JMeter.

b By default, a JMeter thread sends requests without pausing between each request. We recommend that you specify a delay by adding one of the available timers to your Thread Group. If you do not add a delay, JMeter could overwhelm your server by making too many requests in a very short amount of time.

The timer will cause JMeter to delay a certain amount of time before each sampler which is in its scope. If you choose to add more than one-timer to a Thread Group, JMeter takes the sum of the timers and pauses for that amount of time before executing the samplers to which the timers apply. Timers can be added as children of samplers or controllers in order to restrict the samplers to which they are applied.

To provide a pause at a single place in a test plan, one can use the Test ActionSampler.

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