while controller isn't working perfectly when testing for multiple users

Question

I have designed a case to wait for specific model name in GET response and then POST data. It is tested and is working fine when only 1 user and 1 loop are set. When the specific model name is found, then proceed to deploy the model.

JSON Extractor

$..valid_model_list[?(@.model_name =~ /.*Model-Test-${variable}-${counter}-v1-8k/i)]

While Controller

${__jexl3("${modelnameresult_matchNr}" != "1",)}

However, when I ramp up the test to use 2 users and 2 loops. The result isn't as per expectation.

Question 1: Why JMeter isn't running the request in sequence when multiple users and loop are set?

How do I design it in a better way to avoid false-positives in results?

Question 2: The GET (TrainedModelsList) constant timer is set to 1 minute and expectation is that it continues running till the end of the test. It seems it just run to a certain period and stopped. What type of timer should be used in this case?

JMeter deployed these model successfully

Model-Test-2022-02-28T09:46:40784-0001-v1-8k
Model-Test-2022-02-28T09:46:42785-0002-v1-8k
Model-Test-2022-02-28T09:46:44784-0003-v1-8k
Model-Test-2022-02-28T09:46:46783-0004-v1-8k

JMeter start deploy the model and fail although these models are not yet found:

Model-Test-2022-02-28T10:02:51745-0006-v1-8k
Model-Test-2022-02-28T10:18:18831-0007-v1-8k
Model-Test-2022-02-28T10:34:21111-0008-v1-8k
Model-Test-2022-02-28T10:50:24376-0009-v1-8k

Updated with view result notes where the problem occurred at second loop:

Answer 1

• Question 1: Why JMeter isn't run the request in sequence when multiple user and loop is set?

  Each JMeter thread (virtual user) executing Samplers upside down, you can add __threadNum() function and ${__jm__While Controller__idx} pre-defined variable and you will see it yourself.

  I don't know the full details of the test plan

• Question 2: The GET (TrainedModelsList) constant timer 1minute and expect it continues running till the end of the test. It seems it just run to a certain period and stopped. What type of timer should be used in this case?

  I don't know what you're trying to achieve, Constant Timer will create a delay before the requests in its scope, if you want to run the requests for one minute either amend the While Controller condition or use Runtime Controller