To enable this, you’ll need to add the line “_counts=true” to the user.properties file. You can control what to store by adding relevant lines to the user.properties file (you can find this in the /bin folder of your JMeter installation).įor example: with listeners like the Active Threads Over Time Listener or Response Times vs Threads, you’ll need to store the number of currently active threads (as it isn’t done by default). Decide Which Metrics You Need to StoreĬonfigure JMeter to ensure that it will only save the metrics that you absolutely need. This means you’ll be able to view report statistics via your console and or web interface.ĥ. If you want to view metrics during the test execution, try running your JMeter test via the Taurus framework. jtl results file with any listener you want after the test completes and perform its analysis. Enabling them causes additional overheads, which consume valuable resources that are needed by more important elements of your test. Listeners should be disabled during load tests. If you want more information on the available options, check out Five Ways To Launch a JMeter Test without Using the JMeter GUI.ĭisable ALL Listeners During the Test Run I recommend running load tests in the command-line mode, Ant tasks, or Maven plugins - but never the GUI. JMeter is simply not designed to produce high loads in GUI mode, which means that it will not only freeze - but it will also consume loads of resources and produce unreliable load test results. NEVER run a load test on the JMeter GUI! Use it only for test recording, development, and debugging. JMeter Plugins (or other 3rd-party libraries) - for the same reasons as Java and JMeter.JMeter - it’s always best to use the latest version of JMeter as the new releases contain performance improvements and bug fixes in addition to any new features. Java - use the latest 64-bit version of Java SE JDK or Server JRE where possible.Make sure you’re using the most recent versions of the following: Your test might fail if your software is out of date. To apply the change, you’ll need to restart JMeter. For example: if you want to set the maximum heap size to 4 gigabytes, you’ll need to change the line to: HEAP="-Xms1g -Xmx4gm" To do this, find the following line in your JMeter startup script: Just increase the maximum heap size to ~80% of your total available physical RAM. This is actually pretty low considering many modern smartphones have up to four times more! If your test is running massive objects which go over 1024Mb, you’ll get an OOM error and your test will fail.įortunately, there’s a simple solution. JMeter’s default configuration (see jmeter.bat for Windows or jmeter for non-Windows systems scripts) assumes a heap space of 1024 megabytes only. The Java Heap Space (as referred to in the error message) is the memory the JVM takes from the underlying operating system to allocate space for the creation of necessary objects. The JMeter process runs in the Java Virtual Machine (JVM) under various settings and arguments. In this article, I'll show you nine ways to get the maximum load on your JMeter test without changing your current hardware setup including increasing the Java heap size, strategically using listeners, and much more. If you have received this out of memory error, there are easy ways to get around it. Want to Learn More About JMeter & Load Testing?įirst thing's first: How many times have you seen this error on your JMeter load test?.
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