How to chain HTTP request requests in Jmeter Simple Controller? - jmeter

I have multiple Simple Controllers under Thread group. All controllers have 1 HTTP request. Only one controller have 3 requests. How can I chain 3 requests in one simple controller to run sequentially.
Test Plan
The screenshot above is my test plan. In v4/bootstrap call I have 3 HTTP requests. Result of these 3 requests is token which I extract from get_v4/restart and then this token used for all other requests. For correct token generation 3 requests from v4/bootstrap call should run sequently. On summary report shown that amount of run 3 requests is different.

Each JMeter thread (virtual user) executes Samplers upside down. The same applies to Simple Controllers.
So you don't need to do literally anything, each thread will execute samplers sequentially as they appear in the Test Plan.
If you have more than 1 virtual user in the Thread Group you might be confused by the "wrong" order of sample results:
However each user is still executing samplers upside down, you can check it by adding __threadNum() function to show the current virtual user's number and __groovy() function calling vars.getIteration() method
You will see that each user executes samplers sequentially and starts over when the last sampler ends and there are iterations still:

Related

Are all the transaction controllers present in a thread group executed concurrently

This is how the test script is designed. One thread group has multiple transaction controllers. Under each transaction controller there is a GraphQL request.
My question is say this test is executed for 500 threads so will all the requests under different transaction controllers be executed simultaneously i.e. will Request 1, Request 2 and Request 3 be executed concurrentlyClick to see image
It depends, each JMeter thread (virtual user) executes Samplers or in your case Transaction Controllers containing Samplers upside down and waits for the previous response before executing the next request.
If you have 500 concurrent users there is a chance that requests 1-3 will be executed at the same time, but they will be executed by different users.
In case you need to execute all 3 requests at the same time by 1 user - put them under Parallel Controller

How to run both request/sampler successfully

I am trying to run http samplers sequentially for multiple requests. Where the output of 1 API response is the input of next API request. My concern is when I run with 5 users (for. e.g), then at given point of time it first executes 1st API with 5 users then second API with 5 users, in this process the API where input is required gets lost. Please help me on this.Actually I have used transaction controller also but here not sequentially api run,so getting file not found exception bcause of first api output response parameter is not passed to second api as a input parameter
I need a solution, where all the samplers are first executed for first user, then for second thread all the samplers are executed and so on.
Each JMeter Thread (virtual user) executes Samplers upside down, if you have 2 samplers each user will always run 1st sampler then it will run 2nd sampler.
You can use __threadNum() function and ${__jm__Thread Group__idx} pre-defined variable in order to verify that the execution order is sequential.
If you want all the users to execute first sampler then all users to execute the second sampler - go for Synchronizing Timer
If you want to get to the reason of the failure try saving the responses using i.e. Simple Data Writer as it might be the case your "first" API fails silently and hence your correlation doesn't extract the value.

How to execute requests sequentially running multiple JMeter Threads

I have a single thread group which has 3 requests and have set the Number of Threads(users) = 2.
I would like all the requests to be executed in sequential order for each user before it repeats these steps for the next user and so on.
Output expected:
HTTP Request 1_Thread 1
HTTP Request 2_Thread 1
HTTP Request 3_Thread 1
HTTP Request 1_Thread 2
HTTP Request 2_Thread 2
HTTP Request 3_Thread 2
However, the output results vary differently for each run and are not in the order I expect. How can this be corrected?
I have tried following but with no luck in achieving my output
1. Enable/disable "Run Thread Groups consecutively
2. Running the test in non-GUI mode
I have attached a screenshot as an image as I am not able to embed into this message yet.
Appreciate if anyone can help me with this query
Thanks
Output Screenshot
For execution of Sampler Request by only Single Thread at a time use Critical Section Controller.
For more info about Critical Section Controller Critical Section Controller
The Critical Section Controller ensures that its children elements (samplers/controllers, etc.) will be executed by only one thread as a named lock will be taken before executing children of controller.
Critical Section Controller takes locks only within one JVM, so if using Distributed testing ensure your use case does not rely on all threads of all JVMs blocking.
Practical Example:
Place all your request under Critical Section Controller
Run the test for any number of Threads you want
Observe the Result in View Results Tree
Note : If you want to run it sequentially from 1 thread to N, make sure you provide Ramp Up Period properly.

Running specific sampler in jmeter in intervals

I am running my load tests in jmeter. I have login service and a serviceX which is to be tested. I want Authtoken from login service to run serviceX. Token expires every minute. Currently I am having login service in the same thread group and running as much as serviceX. I dont want to continue this. I want to run login service once in every minute in single thread and pass the token to serviceX and ServiceX runs the defined number of threads and time. how to achieve this?
Use Once Only Controller to achieve this. This controller executes the request inside it only once per thread and passes over any other requests under it during further iterations through the test plan.
So, you can put your login service inside the Once Only Controller and serviceX outside of the controller. You have to configure your Thread Group accordingly for the iterations or you can wrap up your serviceX under Loop Controller.
Example:
Say, you want to login your first thread only once and then wants to run serviceX for 10 times, here is the below test plan sample:
Remember, as you want to log in once in a minute and once the only controller works on per thread, so you have to use rampup your thread groups accordingly. Suppose, there are 2 threads, and they will log in in a one-minute interval, then the Thread group configurations will be like:
Now, if you want to run your serviceX for 5 times after the 1st thread login, put your serviceX under the loop controller scope and the loop count value to 5
This is the results of this sample test plan:
Hope this helps!
If you use only one token across all threads (virtual users) it makes sense to add another Thread Group with 1 thread and infinite number of loops to your Test Plan and add a HTTP Request sampler to it along with the relevant Post-Processor to extract the token. Also add a Constant Timer to add pauses between requests, i.e. use 55000 milliseconds as the thread delay value.
Once you have the token you can convert it into a JMeter Property via __setProperty() function
In your "main" Thread Group you can read the current token value using __P() function

Running sampler of jmeter in isolation

Suppose my threads are 30 and iteration count is 1 and I have samplers such as:
sampler1
sampler2
sampler3
....
sampler10
Whenever I run the test plan with corresponding ramp up period some of my samplers are being executed concurrently I meant user 1 is executing sampler1 and also user 20 is executing same sampler which is absolutely fine but I want sampler3 to be executed in isolation i.e. when that sampler is being executed by someone no other user should try to access it.
Is there any way?
I am using Jmeter.
Thanks in advance
As per Using the HTTP Cookie Manager guide you can put your Sampler 3 under Once Only Controller
From documentation
The Once Only Logic Controller tells JMeter to process the controller(s) inside it only once per Thread, and pass over any requests under it during further iterations through the test plan.

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