Jmeter conditionally run iteration upon test resutls

Question

I am trying to create a test plan that will run multiple iterations of stress test. The idea I'm trying to implement is to run 1 minute of HTTP requests to the server and maintain a constant throughput. Then increase the desired throughput and run the test again for 1 minute. I would like to increase the throughput by 100 Requests per Second on each iteration until I see that the actual throughput is much lower than the desired one.

I have successfully created a test plan that runs a constant throughput for a minute: I have a thread group with X threads, and I set the scheduler to duration of 60 seconds. In that thread group I have an HTTP Request Sampler and a Constant Throughput Timer which I set to a desired value.

However I would like to run that in a loop and increase the desired value in the Constant Throughput Timer on each iteration.

Also I would like to stop the loop (Or skip consecutive iteration ) when I see that the actual throughput as observed in Aggregate Report is much lower than the throughput I set in the Constant Throughput Timer for that iteration.

So basically when I reach the point that my server cannot keep up, I don't want to keep stressing it more.

How could I achieve the above described functionalities?

Thanks

Dmitri T Dmitri T · Accepted Answer · 2017-05-22T17:37:03

To increase the throughput by 100 each iteration
- define it as a property in the Constant Throughput Timer using __P() function like ${__P(throughput)}
- define throughput property initial value in user.properties file or via -J command-line argument (you can even do it outside JMeter using Beanshell server feature)
- add Test Action sampler to the end of your Thread Group (it doesn't generate any sample result so it won't appear in the logs)
- add JSR223 PreProcessor as a child of the Test Action sampler and put the following code into "Script" area:
```
def throughput = Integer.parseInt(props.get('throughput'))
throughput += 6000
props.put('throughput', String.valueOf(throughput))
```
This way each iteration throughput will be increased by 6000 requests per minute (100 requests per second)
You can use AutoStop Listener in order to stop overwhelming your server basing on various criteria.

Jmeter conditionally run iteration upon test resutls

1 Answers