I have a task to execute 100K requests using CSV data driven
CSV holds ids
100,
101,
102,
...
In JMeter CSV Data Set Config is saving id variable and call API with ${id}
This is working fine, but I want to execute requests in parallel to reduce time of execution.
It seems that parallel sampler/controller can't be used in this case,
How can this be done using CSV driven test?
In the CSV Data Set Config set "Sharing Mode" parameter to All threads.
In the Thread Group set "Number of Threads" to the desired value
That's it, JMeter will run your requests in parallel and each thread (virtual user) will pick up new line from the CSV file on each iteration as it can be seen using i.e. View Results in Table listener
Related
I have a script which has Login API which fetch the first values from CSV file after other API's run which should run with the same user, after running all the API in thread again it should fetch the second value from csv.
I have done with the entire setup but while running the script it's randomly fetch the value from csv
assuming you are using multiple Thread Group. if yes then look for sharing mode in CSV Data Set Config. link with help you to understand sharing mode
https://www.blazemeter.com/blog/csv-data-set-config-in-sharing-mode-made-easy
For Single Thread Group use sharing mode as Current thread in CSV Data Set Config
What I want to do:
I would like to test behavior of the system for 50 users. Each user has to do the same action X times,
with different input ( X - depends on how many records I have in the CSV file, so if the file contains 1000 records, each user will do the action 20 times).
What I actually did to do that:
I set up CSV Data Set Config (with CSV file with 1000 lines) and ofc set up Number of Threads to 50
What is my problem:
Now I'm quite not sure how to share the CSV file so that all user will have unique poll of the lines from the file. (so each user will have his unique lines from the CSV)
What can I do to workaround:
I can copy thread groups to make 50 thread groups, and add them separated CSV files, but it sounds ridiculous...
Given you set the following values in the CSV Data Set Config
Recycle on EOF: False
Stop thread on EOF: True
Sharing mode: All threads
then each thread (virtual user) will fetch new value(s) from the CSV file which will guarantee uniqueness of the test data
You can check this yourself by using __threadNum() function and ${__jm__Thread Group__idx}; variable
More information: CSV Data Set Config in Sharing Mode - Made Easy
In thread group under thread properties, we can set
number of threads = 50
ramp up period = 1
loop count = 20
So, here each thread after a sec will take next line from csv file and execute it.
This way the same csv file will be shared among different threads.
I would recommend to create multiple CSV files for your test plan and assign the variables accordingly for smooth execution of the script. Using same CSV file can not solve the problem as there are times when few threads executing much faster and others are slow in that case action will start replicating between different threads.
Using ${path} in the 'Paths:' and providing the CSV file location in the 'Filename' under CSV Data Set Config, I am able to get a single user accessing the URL's one after the other from the CSV file.
But to complete my test, I want to get 1000 users access 1000 URL's concurrently to demonstrate the maximum load on a Database server. Please advice.
I am on Jmeter5.0
Define CSV Data Set Config with (default) Sharing mode All threads -
(the default) the file is shared between all the threads.
In same hierarchy of the sampler
Define in Thread Group Number of Threads: 1000
And execute test while each thread get different line/values from CSV
If you want to have "bursty load":
Set "Number of Threads" under your Thread Group to 1000
Add Synchronizing Timer as a child of your HTTP Request sampler and set "Number of Simultaneous Users to Group by" to 1000
So your test plan would look like:
It will execute 1000 requests at exactly the same moment and stop
If you want "prolonged load" - just let your Thread Group to iterate "Forever". You can limit test duration using "Scheduler" input:
It will execute requests with 1000 virtual users as fast as it can for 10 minutes
I am a Load Runner tester and would like to know how below requirements can be done in Jmeter.
Data parameterization - How can we implement unique and random data parameterization in Jmeter.
how do we get vuser id value for each virtual users in a Thread group?
If we need to initialize/load any data during vuser initialization (vuser_init() in load Runner) , how can we do it? Also, how do we call any function when vuser is ending, like vusr_end() in LoadRunner.
In Core JMeter:
For Data parameterization, use CSV DataSet , it will pick columns from CSV file and expose them as JMeter Variables you can use with ${varName}
To get user id, use jmeter function __threadNum()
There is no strict equivalent, for vuser_init you can use a Once Only Controller. For vuser_end, there is no equivalent
For parameterization:
CSV Data Set Config - for sequential data
Random CSV Data Set Config - for random data
HTTP Simple Table Server - for unique and random data, suitable for Distributed Testing (basically equivalent of the Virtual Table Server)
__threadNum()
Normally it is being done in:
vuser_init() - setUp Thread Group
vuser_end() - tearDown Thread Group
I want to simulate a few hundred http request each with a different token and userId which I have in a database table.
What's the best way of setting up a jMeter load test to do this?
You can use JDBC Sampler to extract you data from DB to create a CSV and a JSR223 Sampler using groovy (add groovy-all.jar in jmeter/lib folder) to write the extracted values to a CSV file.
Then in the real plan , use CSV DataSet Config using the generated file.
Depending on how you want to use the dataset, you will play with Sharing mode attribute.
If you want to do both steps within the same plan you can use a Setup thread Group that will contain the JDBC Sampler part to write the CSV File, this will use 1 thread and then
the other part in regular Thread Group that will use the number of users you need.
One way is to put all your parameters into a csv file and use CSV Data Set Config in jmeter. Right click on the thread you have created - add- Config Element- CSV Data Set Config. Remember you need to set the Number of Threads(users) to match the number of users in your CSV file.