Concurrency thread group have different total samples in results with same configurations in jmeter

0
votes

In jmeter, while using concurrency thread group,with same configurations I got different no. of total sanples in summary report. Can anyone explain why it happened?

I've below configurations: Target Concurrency : 20 Ramp up time (sec) : 120 Ramp up Steps count : 10 Hold Target Rate time (sec) : 60

I've run the test twice, both time in summary report, i got 1704 samples and 1973 samples respectively.

1
concurrencyjmeter
Concurrency Thread Group will maintain concurrency for Threads not samples. Sample count may differ based on response time, latency, etc – Adnan

1 Answers

0
votes

JMeter waits for response from previous sampler prior to sending the next request so the deviation is due to response time

  • Higher response time - less results
  • Lower response time - more results

If you want to always have exact amount of sample results - use Throughput Controller in Total Executions mode - this way JMeter will not run more samplers than you specify in the Throughput Controller.

Check out Running JMeter Samplers with Defined Percentage Probability article for more information on the Throughput Controller and ways of defining how often different requests will be executed and how to precisely control your workload.