JMeter - loop controller with variable loop count

Question

I am using JMeter and I want to define one loop controller. In this loop I want to define the loop count with a Jmeter variable. Is this posible?

Thanks a lot

Answer 1

Yes, it's possible.

Define your user variable using the User Defined Variables component, or use the CSV component.

Then, in the Loop Controller, define loop count to: ${nameOfVar}

Since version 4.0 of JMeter, there is an easier way:

• https://jmeter.apache.org/usermanual/component_reference.html#Loop_Controller

JMeter will expose the looping index as a variable named

__jm__Name of your element__idx

So for example, if your Loop Controller is named LC, then you can access the looping index through ${__jm__LC__idx}. Index starts at 0

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Answer 2

You can use the following inside the "Loop Count" field:

${myVar}

e.g. for a random count:

${__groovy(java.util.concurrent.ThreadLocalRandom.current().nextLong(128L),)}

You can access the current loop index (starts at 0) via ${__jm__Loop Controller__idx} where Loop Controller is the name of your loop.

Answer 3

I know is very late to help you, but it can help the others.

One good way to do this is to define a counter inside the loop controller.

Example, if you want a loop with 20 iterations, you put 20 in the loop controller and in the counter you put from 0 - 19. In the counter you can also define an increment. The output variable is named in the Reference Name field.