Thread Groups in JMeter

Thread Group

Thread group element controls the number of threads that will be used to execute in your test. In this you can control the number of threads, the ramp up time, execution time and start and stop time of the test.

Available only after enable of scheduler, used to choose the startup delay

Attribute	Description
Action to be taken after a Sampler error	Continue - ignore the error and continue with the test Start Next Loop - ignore the error, start next loop and continue with the test Stop Thread - current thread exits Stop Test - the entire test is stopped at the end of any current samples. Stop Test Now - the entire test is stopped abruptly. Any current samplers are interrupted if possible.
Number of Threads	Number of users to simulate
Ramp-up Period	To initialize the users on to server
Loop Count	Denotes the number of times the user to perform a particular test
Delay Thread creation until needed	Waits until the completion of the time mentioned to create threads
Scheduler	To enable or disable the scheduler
Start Time	Available only after enable of scheduler, used to mention at what point of time the execution need to be started
End Time	Available only after enable of scheduler, used to mention at what point of time the execution need to be stopped
Duration	Available only after enable of scheduler, used to mention how long the execution is to be happened. Note: If duration time is mentioned, then the end time will be ignored
Startup delay	Available only after enable of scheduler, used to choose the startup delay

Fig: Thread Group with Scheduler enabled

Fig: Thread Group with Loop Count

 jp@gc – Stepping Thread Group

This thread group will start [ 100 ] threads (Users) –> Total number of users are 100.

First Wait for [ 0 ] Seconds. –> There will not be any delay to start the thread once you will run Jmeter.

Then start [10] threads every 30 Seconds —> every 30 seconds 10 threads will start till 100 Threads.

Using Ramp up [5] seconds –> each users taking .5 seconds to hit the server.

Then hold load for [60] seconds –> Once all the threads started it will hold the thread running for 60 seconds.

Finally, Stop [5] threads every [1] sec. –> in each second 5 thread will stop.

Fig: Stepping Thread Group