Jmeter Request Execution

Question

I am trying to understand jmeter's core behavior.
Say I am executing a HTTP request (single user and single sampler but different variable values) in infinite loop.
In the above case does jmeter send a request and waits for the response before sending the next request OR it sends the requests without waiting for response?

Answer 1

Jmeter uses a thread-based model where each thread will wait for a response before sending another request. In other words it will only drive the load as fast as application can take it.
In JMeter you specify a number of threads in a ThreadGroup which equate to virtual users, and the threads attempt to execute the script as many times as possible.

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If you want to maintain a constant rate, you can use multiple threads and use a Constant Throughput Timer to set the request rate: if there are enough threads, it should be possible to maintain the rate even though some threads are waiting for a response. Here belongs also custom Throughput Shaping Timer which is more flexible.

Another possibility seems to be to use e.g. either Ultimate Thread Group or Stepping Thread Group from jmeter plugins.

In this context you can also look onto the Response Timeout field available for any jmeter's sampler - number of milliseconds to wait for a response.