![]() There are also separate sampling for 3, 4 and 5, which is not well exposed in any dedicated report in Mission Control at the time of writing. JFR samples only threads in categories 1 or 2. waiting to do something in native non-Java code.ready to run in native code but waiting in OS queue to get CPU.running on CPU in native (non-Java) code.ready to run in Java code but waiting in OS queue to get CPU.If we look at Java thread at any given time, it could be I mention what CPU metrics are important during profiling with JDK Flight Recorder. Of course, you would need an application you will profile and some load to keep it busy. In the latter case, you need JMX port configured on a remote JVM. You can use mission control with either a locally running JVM or a remote one. You can find more details in this post by BellSoft. If you stick with Java 8, Flight Recorder support is available with OpenJDK 8u262. You can get the distribution of OpenJDK and Mission Control for your OS from Liberica if you don’t have them already. ![]() We will work with OpenJDK 11 and Mission Control 7.1, JDK Flight Recorder is integrated into OpenJDK 11. Let’s launch the application and start profiling, right? Starting profiling with Mission Control This is what we call “hot code” or “code hotspots.” Profilers are great tools for identifying “code hotspots” and JFR + MC is an excellent profiler combo. If you want to reduce the time spent on a request, it is obvious to focus on code that takes the longest to run. “Performance” is most commonly expressed as execution time (time needed to execute operation) or throughput (number of operations executed per time unit). Usually, you are starting a profiler when there is a performance problem, or you want to optimize code to meet specific performance goals. ![]() In this article, I would like to walk you through the code profiling features they offer. They have a few powerful tools for code execution profiling. JDK Flight Recorder (JFR) and Mission Control (MC) are free and open source performance/profiling products available with OpenJDK 11. Hunting down code hotspots is probably the most common task for Java profilers.
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