Jmeter: How can I keep 1000 or “X” users login requests session alive using JMeter?

Question

Here is my Test Scenario:

First, I am generating a load which includes only Login Requests (say for 1000 users). I am using "Ultimate Thread Group" and "Constant Throughput Timer" in my script. Constant Throughput Timer Value=120/sec is used. I want to run this test for five or ten minutes. My load would be held for 3 minutes.

During this Test(while loads are held) , I am sending another set of login requests from the different machine (say for 100 users). I want to measure the response time of this 100 users login which I've generated from the different machine.

But My Requirement is: While I'm sending 100 users login requests, My Previous 1000 users login requests session should be alive on the server. I've also checked "Use KeepAlive" in my login sampler.

So, How can I achieve this?? How can I be sure that my previous all the login requests sessions are held on the server?

Test Script:

Image 1: Screenshot for Ultimate Thread Group

Image 2: Screenshot for Constant throughput timer

Answer 1

You need to consider following fields of ultimate thread group -

1. Shutdown time for 1000 threads ( ramp down time)

2. Hold load for - for 1000 threads.

3. Initial delay for 100 threads. ( time between starting the script and first server hit)

4. start time for 100 threads - make sure the 100 threads get ramp up before 1000 threads get shut down. Each thread would be start after ( start time/ start thread count ) seconds from the previous thread.

you need to configure these values in such a way that the first 1000 threads don't get shut down till the all of the next 100 users are active.

Also you can use the active thread over time graph which is provided with in the ultimate thread group to see how the many threads would be active.

P.S Don't confuse the thread number with number of requests, each thread will create multiple requests for seconds in field " Hold Load for ".