JMeter is a great tool for performance testing however its important to know how to use if efficiently to get accurate results out of your tests. These best practices will help you setup your performance tests effectively.
1) Always use the latest version
JMeter is still in development and the developers are improving it day by day. Using the latest version of JMeter is a good choice since it would contain bug fixes and enhancements. Each version of JMeter ships with release notes that tell you what has changed.
2) Use correct number of threads
JMeter can consume significant computing resource when it is simulating the test. If you create too many threads, it may affect the performance of the machine on which JMeter is running.
JMeter needs to create requests to the test server and process the response from the test server when running the test. If the machine on which JMeter is running is not able to handle the number of requests and response the test may not be executed accurately and the results may be inaccurate.
In order to avoid overloading the machine running JMeter, its advised to keep the total number of threads below 300.
If you have to simulate a heavy load, you should use distributed testing with JMeter.
3) Using the HTTP(S) Test Script Recorder
Recording the testing in JMeter can help save the effort required to create the test. You can record the operation one time and JMeter can replay it whenever you want.
4) User Variables
Some test plans need to use different values for different users / threads. For example, you might want to test a sequence that requires a unique login for each user. This is easy to achieve with the features provided by JMeter.
5) Use less resources
Running JMeter in GUI mode may consume computer memory and high processor usage under heavy load. It may cause your computer to run slower and lead to performance issues on your machine.
The below tip can be used to avoid performance issues on your machine.
- You can use the GUI mode to create the Test Plan. Use the command line mode to run the JMeter test instead of GUI mode.
- Use as few Listener as possible.
- Avoid using the “View Result Tree” listener as it consumes a lot of memory
- If you really need the View Result Tree, check the Error option
- Use CSV output rather than XML (because CSV data is much simpler than XML data)
6) Check JMeter log
JMeter record all the information such as error, debug, time etc., when executing test. Checking the log helps you to detect the error early.
7) Naming convention
All the JMeter elements such as Thread Group, Test Plan, Listeners, and Samplers should be named using a descriptive, simple name. Following the naming convention will help you to maintain the Test Plan and recognize elements easily.
Now that you have been through the JMeter tutorial, you can test your knowledge of JMeter by reading up on the Top JMeter Interview Questions and Answers.