Concurrency and ultimate thread group Setup

Question

I want to use Concurrency thread group, so I'm using this configuration

Why I'm expecting is to send 10 requests in 5 seconds, and hold them for 1 second but the result after running my script is this, more than 10 http request are send.

How can I control only send 10 requests?

Thank you.

A similar behaviour happens with Ultimate thread group

Answer 1

You're not sending 10 requests in 5 seconds, you're launching 5 threads (virtual users) in 5 seconds, to wit JMeter will add 2 virtual users each second for 5 seconds and then hold the load for 1 second.

The actual number of requests which will be made depends on your application response time, higher response time - less requests, lower response time - more requests.

If you want to send exactly 10 requests in 5 seconds evenly distributed go for the following configuration:

• Normal Thread Group with users * loops = 10, to wit:

  • 10 users - 1 loop
  • 5 users - 2 loops
  • etc.
• Throughput Controller in Total Executions mode and Throughput set to 10
  • HTTP Request
    • Throughput Shaping Timer configured to send 2 requests per second