I am using CSV data set config for parameterization purpose in jmeter but I want the setting to be done as below:
The total number of threads are 20. There are 40 values in my CSV. I want all my threads to take first value during their first iteration and second value during second iteration. But JMeter is assigning unique value to all 20 users in the first iteration itself. Please help me how can I do this?
As far as I understand your requirement you need 20 threads to
Read lines from 1 to 20 during first iteration
Real lines from 21 to 40 during second iteration
In order to achieve this:
Add CSV Data Set Config to your Test Plan and configure it like:
Add Synchronizing Timer as a child of the associated request and configure it like:
That's it, this way you will get confidence that all 20 users will execute first 20 calls before proceeding to the next iteration:
Related
I have set 4 virtual user on thread group and i have set csv file config having 2 rows of data.when i run the test the first iteration 2 virtual user is fetching data sequentially but in the next iteration the remaining 2 virtual user is fetching ramdom data not sequentially.I want to fetch data sequentially on the next iteration (1 user->first row,2 user->second row) next itetation(3user->first row,4user->second row) how can i achieve that?
I don't think you can achieve this using CSV Data Set Config as in case of concurrency you might run into the situation when pre-allocated entry for the user will be not sequential when it comes to test results.
If you want to have the following sequence:
line 1
line 2
line 1
line 2
no matter how many users/iterations you have and what is response times fluctuation you need to consider switching to __StringFromFile() or __CSVRead() functions instead of 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 ${__jm__Thread Group__idx}; variable
More information: CSV Data Set Config in Sharing Mode - Made Easy
In thread group under thread properties, we can set
number of threads = 50
ramp up period = 1
loop count = 20
So, here each thread after a sec will take next line from csv file and execute it.
This way the same csv file will be shared among different threads.
I would recommend to create multiple CSV files for your test plan and assign the variables accordingly for smooth execution of the script. Using same CSV file can not solve the problem as there are times when few threads executing much faster and others are slow in that case action will start replicating between different threads.
I have a use case where 10000 users are hitting the API sequentially.
first 1000 users/sec are hitting an API then they hold for 10-15 seconds and again another 2000 users are going to access the api.
Issue is i have an api <path>/user_id/${userId} and i have 10000 user ids stored in a .csv file
how fetch the file for every 1000 users at first set and 2000 users in the next?
I have added CSV Data set Config and i have the .csv file path
Below screenshot is my .csv set config.
Beanshell error
GetUserID API
Ashu
To pick first 1000 userIds for first 1000 threads and and next 2000 userids for next 2000 threads and so on follow this steps
Create a csv file with only userIds(Do not mention the column name in csv).
To the JMeter test plan add a simple thread group and bean shell sampler to the thread group.
Add the following code to the beanshell sampler
above code will add UserIds to JMeter properties.
now to pick userIds use
${__P(user_id_${__longSum(${__threadNum},-1,)})}
I have created a sample test plan to pick only first 10 values from csv for the first minute and pick next 10 for the next minute you can see the screenshot here
I would recommend run the tests in cloud.
Please follow this link to know more
My Jmeter script is taking all the values from CSV but when I see it in the HTTP request output, they are not been displayed sequentially. For e,g- 50th row in CSV does not correspond to 50th HTTP request.
Thank you!
This should be fine when you have more than 1 thread and all threads are sharing the same CSV file.
Each thread executes the test plan independently - but share the same csv file. these threads do not wait for each other. Ex: Thread 3 does not have to wait for thread 2 to pick the second row. It is like first come and first serve! Whichever thread is ready to pick the data - it gets the data from csv. Rest assured all the csv rows will be read sequentially ie..not random rows.
How to login multiple users with different input in different threads in Jmeter using CSV data set config?
I have added CSV data set config but the thread is picking only the first entry and i m not able to see the responses for other user login
If you use CSV data set config which contains parameterized values which users(threads) will use while running script.
below is snapshot of jmeter of csv data set config which contain emp.csv file which contains values like,
nachiket,101,test
nikhil,102,test
harish,103,test
which are empname,empid,passwd respectively for 3 users.
if you run test with 3 users then thread1 will pick first and 2nd thread will pick 2nd val so on and you can repeat the file if it has less values than no of threads.
You need to provide enough loops/iterations as given one iteration only CSV Data Set Config will read only the first entry.
Try putting the request you want to parametrize under a Loop Controller, set enough loops and see whether it resolves your issue.
See Using CSV DATA SET CONFIG guide for more details.