How to do Java profiling in IntelliJ?

Brittany 137 Published: 11/15/2024

How to do Java profiling in IntelliJ?

Here are the steps to perform Java profiling in IntelliJ IDEA:

Create a new profile: Go to Run > Edit Configurations... and click on the + button to create a new configuration. Choose Java Application as the type, enter a name for your configuration (e.g., "My Profiling Session"), and specify the main class of your application. Set up profiling: In the Run > Edit Configurations... window, click on the VM Options tab and add the following options to enable profiling:

   -Xrun jdwp:server=5005,address=localhost:5006,transport=dt_socket

This sets up a Java Debug Wire Protocol (JDWP) agent that listens for incoming connections.

Start the profiler: Run your application by clicking on the Run button or pressing Shift+F10. IntelliJ IDEA will start your application in debug mode and attach to it with JDWP. Connect to the profiler: Open a new window in your IDE (File > New Window) and go to Run > View Profiling Reports. This will open the Java VisualVM tool, which is used for profiling. Select the application process: In the Java VisualVM main window, you'll see a list of running Java applications. Find your application in this list and select it. Profile the application: Once you've selected your application, you can use various tools in VisualVM to profile it: CPU Profiling: Click on CPU > Hot Spots to view a graphical representation of which methods are using the most CPU resources. Heap Walker: Click on Memory > Heap Walker to explore your application's heap usage and identify potential memory leaks or inefficiencies. Thread Dump: Click on Threads > Dump Threads to see a snapshot of all threads running in your application, which can help you diagnose concurrency issues. Stop the profiler: When you're finished profiling, go back to the VisualVM main window and click on the File > Quit menu option to stop the profiler. Save the profile report: You can save your profiling report as a CSV file for further analysis or sharing with other developers.

That's it! By following these steps, you should be able to set up and use Java profiling in IntelliJ IDEA.

What is profiling in Java?

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