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Understanding JMeter Element- Thread Group

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by , 06-21-2015 at 01:36 AM (104 Views)
Understanding JMeter Element- Thread Group

Thread group elements are the beginning points of any test plan. All controllers and samplers must be under a thread group. Other elements, e.g. Listeners, may be placed directly under the test plan, in which case they will apply to all the thread groups. As the name implies, the thread group element controls the number of threads JMeter will use to execute your test. The controls for a thread group allow you to:
Set the number of threads
Set the ramp-up period
Set the number of times to execute the test

Each thread will execute the test plan in its entirety and completely independently of other test threads. Multiple threads are used to simulate concurrent connections to your server application.
The ramp-up period tells JMeter how long to take to "ramp-up" to the full number of threads chosen. If 10 threads are used, and the ramp-up period is 100 seconds, then JMeter will take 100 seconds to get all 10 threads up and running. Each thread will start 10 (100/10) seconds after the previous thread was begun. If there are 30 threads and a ramp-up period of 120 seconds, then each successive thread will be delayed by 4 seconds.

Ramp-up needs to be long enough to avoid too large a work-load at the start of a test, and short enough that the last threads start running before the first ones finish (unless one wants that to happen).

Start with Ramp-up = number of threads and adjust up or down as needed.
By default, the thread group is configured to loop once through its elements.

JMeter has test run scheduler. Click the checkbox at the bottom of the Thread Group panel to reveal extra fields in which you can enter the start and end times of the run. When the test is started, JMeter will wait if necessary until the start-time has been reached. At the end of each cycle, JMeter checks if the end-time has been reached, and if so, the run is stopped, otherwise the test is allowed to continue until the iteration limit is reached.

Alternatively, one can use the relative delay and duration fields. Note that delay overrides start-time, and duration over-rides end-time.



Disclaimer: The article/post is posted with the purpose of sharing knowledge and information.
The article may contain references, extract or content from other informative sources.
Researched/Authored/Compiled by -
Ronak Shah
Practice Head - Software Testing (QA), CIGNEX Datamatics

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