2nd iteration of all thread groups is to be started after the first iteration of the thread group with longest iteration time is complete.
This behaviour is only to be there in 2nd iteration. Not in first, third, fourth or any subsequest iteration.
Need help in achieving this.
Consider using Inter-Thread Communication Plugin.
Example scenario:
After first iteration each thread group writes something into FIFO queue using __fifoPut() function
Add If Controller and come up with a condition to start 2nd iteration only if the size of FIFO queue is equal to the number of your Thread Groups in the test plan
Check out SynchronizationExample.jmx plan for a demo use case.
You can install Inter-Thread Communication Plugin using JMeter Plugins Manager
Related
No.Of Iterations in a thread Group is : 3
Thread Group Name from the below screenshot is : TCByEmployee
Thread Group performs various steps using If Controller
I want to Achieve "Loop Controller-TCbyEmployee-Login by Employees"
& "If Controller-TCbyEmployee-Login by DH" should start Next Iterations once it's completes "If Controller--TCbyEmployee-Login by PA" Iteration 1
Now the issue is : "Loop Controller-TCbyEmployee-Login by Employees"
& "If Controller-TCbyEmployee-Login by DH" continues the up to Iteration 3 before "If Controller--TCbyEmployee-Login by PA" begins
Please see the below screenshots
Your question in its current form doesn't make any sense, you need to either re-phrase it or provide minimal reproducible example
So far I can only inform you that:
Once started each JMeter thread (virtual user) starts executing Samplers upside down (or according to the Logic Controllers)
When thread executes last Sampler in the Thread Group it starts over from the beginning
If there are no more Samplers to execute or loops to iterate the Thread is being shut down.
If you're looking for a way to implement a GOTO statement - take a look at Test Fragments and Module Controller, this way you can change the flow from upside down to some custom
Also be aware that threads (virtual users) are absolutely independent and if you think that the execution order is broken might mean that another user executed another sampler at that moment
And last but not the least, don't run your test in GUI mode
I have 4 thread groups in my test. I have requirement as below:
I want first 3 thread groups to work sequentially. Hence, I have checked the chekcbox "Run Thread groups consecutively". But, i want my fourth thread group to start 30 mins after the third thread group while the third thread group is still not complete. Can this be achieved on Jmeter. Any help on this is highly appreciated.
If you tick Run Thread groups consecutively box you won't be able to have more than 1 thread group running at any moment of time.
So you need to untick that box on test plan level and start all Thread Groups in parallel.
The fact that the thread group has started doesn't necessarily mean that it will start executing Samplers, you can delay the execution until the previous Thread Group is done.
For example you can use Inter-Thread Communication Plugin for this purpose, in 1st thread group and put something into a FIFO queue and then try to read the value using jp#gc - Inter-Thread Communication PreProcessor in the 2nd Thread Group (add it to the first sampler). The 2nd Thread Group will start executing samplers only when the value will be available in the queue.
See SynchronizationExample.jmx test plan for example implementation
The same approach should be applied for thread groups 3 and 4, when 3rd thread group starts - put something to the FIFO queue so 4th thread group would be aware that the 3rd one has started, then you can "sleep" for 30 minutes using Flow Control Action sampler
Usecase :- My test contains 3 Thread Group. Each Thread Group is having one loop controller with loop count 2 and all the HTTP requests inside it.I need to execute first loop iteration and pause the loop iteration then execute next thread loop's first iteration and pause until first loop iteration of all the Thread Group is completed. After completion of first iteration start second iteration of all the Thread Groups.
enter code here
Go for Inter-Thread Communication Plugin, it provides possibility to share the variables across threads (and Thread Groups) via some form of a FIFO queue so you can use it as a "trigger" for the next iteration start in other thread groups.
Check out How to Use the Inter-Thread Communication Plugin in JMeter article for more details.
Be aware that the Inter-Thread Communication Plugin is not a part of JMeter distribution bundle, you will have to install it using JMeter Plugins Manager:
I want to run a thread x times. The thread group contains three samplers and because I dont want them to be mixed up in the result windows I only want to start the next thread when another is finished. I don't want to use a Ramp-Up Period because a thread could take 1 to 20 seconds.
You could use 3 thread groups and module controller (to referencd in the 2 other thread groups the elements in the first one to avoid copy ) and check on test plan the option:
Run Thread Group sequentially
Your use case is not very clear, however if you need to limit JMeter to X concurrent threads only the most obvious choice would be going for the Concurrency Thread Group
As per Advanced Load Testing Scenarios with JMeter Part 4 - Stepping Thread Group and Concurrency Thread Group article:
The Concurrency Thread Group provides a better simulation of user behaviour because it lets you control the length of your test more easily, and it creates replacement threads in case a thread finishes in the middle of the process.
You can install Concurrency Thread Group as a part of Custom Threads Group bundle using JMeter Plugins Manager
Regarding your three listeners bit, I would recommend reconsidering this approach as per JMeter Best Practices you should not be using any listeners, instead of it you need to run JMeter in non-GUI mode and use -l command-line argument to specify the results file name. Once your test is finished you can open the .jtl results file with a listener of your choice or generate a reporting dashboard from it.
You can use "jp#gc - Ultimate Thread Group". The Ultimate Thread Group provides flexible thread scheduling to your test scenario. It allows us to create a scheduled thread with advanced configuration. Start Threads Count, Initial Delay, Startup Time and Hold Load Time can be defined separately for each record.
You can define tasks to run consecutively.
This platform support flexible thread scheduling. You can read detailed wiki docs about the ultimate thread group.
Link: Loadium.com/wiki/ultimate thread
I am have been exploring JMeter for the last couple of days. And I am try to achieve the following:
I am trying to create a load test for a service such that, in the first loop 'n' threads are created and in the second loop 'n+m' threads are created and in the third loop 'n+2m' threads, in the fourth 'n+3m' threads and so on. I did find many solutions here and I tried replicating them, but somehow it is not working for me. The test plan I created looks something like this:
Step 1: Add a user defined variable called USERCOUNT = 0
Step 2: Create a thread group. I have used __intSum to increment USERCOUNT by one and storing the result back in USERCOUNT for future reference.
Ideally what I am expecting here is, in the first loop one thread is created, in second loop 2 thread are created and in the third loop 3 threads are created. So in total there should be 6 thread created. However the results show up something like this:
Not sure if I am missing something silly or my approach itself is completely wrong. Any help from the community would be appreciated. :)
I believe what you are trying to do is impossible. When JMeter starts a thread group for the first time it initializes the number of threads.
What you are essentially trying to do is re-run the same test three times with different numbers of users each time. JMeter cannot re-run a thread group once started, it can only re-run ("loop") a thread in a thread group. It is not possible to add threads to a running thread group once the ramp up and threads are initialized. (Let me know if I should try to explain that further).
If you want one thread group to populate the run-time settings of another thread group, you must have two thread groups in the test plan. At the test plan level, check off the option "Run Thread Groups Sequentially."
With that option, JMeter will not initialize the number of threads on the second thread group until the first one finishes. The first thread group can set a global property, and the second thread group can reference it in the number of threads.
How to set a property in beanshell: (this would be in Thread Group 1)
props.put("threadgroup_2_num_users","15");
How to reference that value in Thread Group 2:
${__P(threadgroup_2_num_users)}
If this does not help, maybe try to describe your end goal. What are you trying to learn about the thing you are testing?
Edit: Perhaps using the plugin package "Stepping Thread Group" will allow you to achieve the scenario you are trying in a single thread group. Check this out:
http://jmeter-plugins.org/wiki/SteppingThreadGroup/
JMeter currently doesn't provide possibility to change number of threads on-the-fly during test execution so I would suggest to go with the following alternatives:
Use i.e. Ultimate Thread Group available via JMeter Plugins which adds some extra features to JMeter's Thread Group so you will be able to implement your scenario
Consider so called "goal oriented scenario" when load is based on requests per second rather than on number of virtual users. You can precisely set desired throughput rate and even change it during test run using Constant Throughput Timer