multithreading - Why only 2 out 3 JMeter Thread group execute?

Question

I've a JMeter Test Plan with 3 thread groups, but when I run the test plan of these only 2 run at any given time. Any idea why?

Answer 1

By default, JMeter runs "Thread Groups" concurrently, unless otherwise we checked the "Run Thread group consequently" in "Test Plan". Below is the screen shot.

Follow the below Steps :

1.Verify "Test Plan", make sure that uncheck "Run Thread group consequently" check box.
2.Use Latest JMeter (not mandatory, but better to have it)
3.Run the JMeter test