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Distributed testing in JMeter in non GUI mode

Did you know that Distributed load testing in JMeter involves using multiple JMeter instances running on different machines to simulate a higher load on our application?

JMeter allows us to perform distributed testing in non-GUI mode. In other words, we can run the test without the graphical user interface.

Furthermore, this method is more efficient and suitable for large-scale testing.

Let’s take a look at how to perform distributed testing in JMeter’s non-GUI mode.

How to perform Distributed Testing in JMeter non-GUI mode

1. First, we have to create our JMeter test plan normally and specify the test scenarios, thread groups, samplers, listeners, etc.
2. Then, we have to copy our JMeter test plan to all the machines that will act as JMeter “slave” instances. Furthermore, these machines will contribute to generating load for our distributed test.
3. Next, we have to choose one machine to act as the JMeter “master.” This machine is responsible for coordinating the test execution and collecting results. The other machines will be our “slaves.”
4. Then, we have to open a terminal and head to JMeter’s bin directory on the master machine.
   We can use this command to start the test in non-GUI mode:

   jmeter -n -t path_to_test_plan.jmx -R slave1_IP,slave2_IP,... -l test_results.jtl

   Here:

   • -n: Starts JMeter in non-GUI mode.
   • -t path_to_test_plan.jmx: The path to our test plan.
   • -R slave1_IP,slave2_IP,…: Lists the IP addresses or hostnames of the slave machines.
   • -l test_results.jtl: The name of the results file.
5. Now, we can run JMeter in non-GUI mode on each slave machine with this command:

   jmeter -s -j jmeter_slave.log

   Here:

   • -s: Starts JMeter in server mode on the slave machine.
   • -j jmeter_slave.log: The name of the log file.
6. Then, the master machine will coordinate the distribution of load to the slave machines. We have to monitor the terminal on the master and slaves for any output or errors.
7. Now, it is time to analyze the results using JMeter’s listeners. Alternatively, we can load the generated .jtl results file into the GUI for analysis.

Benefits of Distributed Testing in Non-GUI Mode

• Efficient resource utilization:

  Running tests in non-GUI mode consumes fewer resources compared to the GUI mode.
• Scalability:

  We can easily scale our testing by adding more slave machines to distribute the load.
• Automation:

  Non-GUI mode is suitable for automation and integration into CI/CD pipelines.

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Conclusion

In brief, our Support Techs demonstrated how to carry out Distributed testing in JMeter in non GUI mode.