I need a new "ROOMID " every time I run a test. I setup a random variable generator to give me a new ID each time the test is run. However, if I set the number of threads to 5 it gives a different ID for each one. I need it to use the same one for each thread. I only need it different each time I run the test.
I know it is occurring because I am calling the variable listed in the Random Variable Generator. Is there anyway to just get 1 random conference ID for all the threads?
Example
Random Variable Generator creates an ID.
Do an HTTP request and set it to run five threads:
1st gets 123456
2nd gets 234567
3rd gets 7451236
4th gets 4452189
5th gets 1254866
I need all of them to receive 123456.
Then the next time I run the test I need them to all get a different ID.
Please follow the below steps to generate random number to be constant across threads.
In the Test Plan, create a variable myVar and set the value as ${__Random(1,999999,)}. You can configure the maximum value in the random function.
In Thread Group enter the number of threads as 5 as shown below.
Execute the script. In View Results Tree or Debug Sampler you can view the value of myVar which is constant across the threads.
Related
I have a requirement to generate a random number and use it in subsequent requests. So, before using this newly generated random number in first subsequent request, i need to check if this random number generated is already exists in the application or not by comparing with newly generated response number. So for this validation i am thinking to use an extractor to get the count and eventually verify this is >1 and make it run until this condition is invalid. So in case of random number already exists, i need to generate a new random value since the previous one is already exist in the application. Any snippet i can use here?
An easier option would be going for __time() function which produces an Unix timestamp in milliseconds from 1st of Jan 1970. To be on the safe side you can add current thread number to it so even in case of concurrency you would get unique values (incrementing each millisecond):
More information on JMeter Functions concept: Apache JMeter Functions - An Introduction
I have a JMeter Test Plan with many copies of almost exactly the same test. In each case there is a variable that is slightly different.
Here is the configuration:
There are two sets of user variables. There is a top level user variable list, that contains maximum_runs and there are Test Fragment level user variable lists with the User Defined Variable add_users, which goes up by 10 for each test case. users is a static 10.
I set maximum_runs to 100 and disable all but one Test Fragment. This gives me a number of samples = 100 for each Fragment. I enable a second Test Fragment and I still get 100 samples. But as soon as I enable the third Test Fragment my number of samples drops to 90. 4th, 80. But on the 5th one it goes right back up to 100 and the cycle starts over again. I don't see anything wrong with my math so I believe it to be something about how JMeter uses jexl2 or maybe variables are being changed due to the number of Fragments running? I really need to be able to run this with the same number of samples no matter how many Fragments are running. Ah, note, I have Run Thread Groups consecutively (i.e. run groups one at a time) in Test Plan checked.
I had a similar issue with one application. 1 out of 4 test components just would not go up more, than 50 percent of required users.
The problem was that component was a memory eater and when it reached the maximum heap it did not let the other threads in that component to ramp-up. But just a long shot.
I am new to JMeter and it maybe a stupid question but I still find it hard to understand the concept here.
I have a simple test.
Thread Group with a Single thread with loop count of 2
PreProcessor that place two
variables on the vars map
A loop that execute a request twice based
on the PreProcessor parameters
I expected that the preprocessor will initialize the parameter and it will use the same values twice in the request.
It looks like it’s executing the PreProcessor once pair call.
When I switch the PreProcessor with similar User Defined Variables it reuses the same value on every call.
Can anyone explain the logic here?
I am using JMeter 2.11
A PreProcessor is executed each time the HTTP Request is executed so if you have a total of 2 iterations, you should see log twice, you have it 4 times so maybe number of iteration is different than what your write or you have 2 threads.
When you use User Defined Variables, the value is computed once and then reused. Value will be different per thread.
After reading the documentations and with #UBIK LOAD PACK help I used User Variables and it worked
User Variables - are specific to individual threads.
Pre-Processor is attached to a Sampler element (e.g. http request in our case), then it will execute just prior to that sampler element running
So 4 request for different parameters because it runs before every request
User Defined Variables - It is processed at the start of a test, no matter where it is placed. For simplicity, it is suggested that the element is placed only at the start of a Thread Group. This is why I get the same value all the time
I'm new in JMeter, my question is if there is a listener that records "Total" threads over time available, or how can I create it. By saying "Thread" I mean the whole process inside the thread, PER USER. for example, if a thread contains 10 virtual users and approximately finish one loop in one minute, therefore I have 10 total in first minute, 20 in minute 2, and so on.
For example, I want to know how many times a thread was run at the end of test or at a certain time.
I just defined a unique reference name for each individual counter and then added a Beanshell PostProcessor at the Thread's end. Counter start was set as 1 with Increment of 1 (Duh!)
In the Beanshell PostProcessor, set the Parameters box as ${your_counter_reference} and an easy script to see the number in the console: System.out.println("counter x:"+ ${your_counter_reference})
When you stop the test, look for biggest number of each thread in the console.
I have a Jmeter thread group that uses the variable uuid several times throughout.
uuid is defined with 12345678-1234-4444-a123-${__Random(111111111111,999999999999)}
In other words, it starts with a fixed series 12345678-1234-4444-a123- and then randomizes the last twelve characters.
I want to run several threads at the same time, this gives the following problem.
When I define uuid as a user defined variable inside the thread group, it randomizes once and then uses that value for all my threads.
If I set it globaly, the same thing happens.
I will be running thousands of threads at the same time when I'm done, so I can't do manual solutions or read/write to disk.
Does anyone out there have experience with this?
I have been through the documentation and Google for quite a while, but can't seem to find a solution.
In short: I need to randomize a variable, use that variable throughout the thread group, and run this thread group in several simultaneous threads. The variable should have different randomized values in each different thread.
Suppose you can simply use Random Variable configuration element instead:
Variable Name: uuid
Output Format: 12345678-1234-4444-a123-000000000000
Minimum Value: 111111111111
Maximum Value: 999999999999
Per Thread (User): True
Generated value
can be accessed as ${uuid};
unique for each thread;
preserved between different samplers calls flow of each thread (not regenerated during each reference);
generated during each iteration of Thread Group.
Test Plan
Thread Group
Random Variable
...
Sampler 1
Sampler 2
...
e.g.
iteration: 1
thread: 1
sampler 1: VALUE_1-1
sampler 2: VALUE_1-1
...
thread: 2
sampler 1: VALUE_2-1
sampler 2: VALUE_2-1
...
...
iteration: 2
thread: 1
sampler 1: VALUE_1-2
sampler 2: VALUE_1-2
...
thread: 2
sampler 1: VALUE_2-2
sampler 2: VALUE_2-2
...
...
Sample script implemented for schema given above: rnd-var.jmx
As per Random Seed field description of Random Variable:
Default is the current time in milliseconds. If you use the same seed
value with Per Thread set to true, you will get the same value for
earch Thread as per Random class.
If two instances of Random are created with the same seed, and the
same sequence of method calls is made for each, they will generate and
return identical sequences of numbers.
Keep it in mind on implementing scenarios with high concurrency (as mentioned below in comments).
To overcome this issue you can use randomize seed with e.g. ${__Random(MIN,MAX)} as value of Seed for Random function field.
Just put
12345678-1234-4444-a123-${__Random(111111111111,999999999999)}
inline where you need.
If you put this in your UDV component, value is assigned once only, before threads are even started.
The behaviour is OK according to jmeter documentation. Please read it carefully.