How to request AJAX concurrently with a HTTP request in Jmeter

Question

In our current test plan we request a product page that contains AJAX. To get this AJAX data we use an xpath extractor, then build a new url path and request the ajax. The problem is we have a constant throughput timer which slows down these requests, when in reality we want them to all happen at once. Our test plan is as follows -

View Product Fragment

-HTTP Get Product Page
--build AJAX request
-HTTP Get AJAX information

Master Test File
-Call Product Fragment
-constant throughput timer (1 request per minute)

Is there any way to override the constant throughput timer from within the View Product Fragment?

I've tried nested controllers/timers but none of them seem to work.

Answer 1

You need a JSR223 Sampler or custom Sampler which won't respect JMeter Thread Group settings and will be able to fire off concurrent AJAX requests using it's own thread pool.

See How to Load Test AJAX/XHR Enabled Sites With JMeter guide for implementation details.

Answer 2

I've added some info regarding a custom sampler that I found on github to this question:

Performance Testing of AJAX calls via JMeter

It is working very nicely for me.