Home/ Questions/Q 7007985
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-27T21:40:39+00:00

While either IntelliJ or Eclipse are running, I can see how much heap they

  • 0

While either IntelliJ or Eclipse are running, I can see how much heap they are using from inside the application from the progress bar at the bottom.. it always indicates a sub 512 MB value which the max size allocated on startup.
Now in many cases, if I look from the OS (Linux) it says that the app is using about 1300 MB, I understand that the libraries, stack, memory mapped files, … are not in the heap…
But why is the difference that big? There is usually about 1GB difference…Why?

Thank you.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    JVM memory usage can be explained by this image:

    JVM Memory Usage

    As you can see, it’s not just -Xmx. Total process memory would also include the -XX:PermSize, stack size of all the threads, JVM memory used by the JIT and other internals. Don’t forget about the memory mapped files which are also included in the process memory. IntelliJ IDEA uses memory mapped files for caches, so it can add several hundreds megabytes.

    If you need the details, use some profiler like JConsole or YourKit.

    • 0