How does the Java Virtual Machine (JVM) organize memory into different pools?

Java Memory Pool Division Explained

Java applications utilize various memory pools to manage memory usage efficiently. JConsole, a monitoring tool, allows you to view these pools and their respective contents.

Heap Memory

Heap memory holds objects and arrays allocated during runtime. There are three primary pools within the heap:

• Eden Space: Initial memory allocation for most objects.
• Survivor Space: Pool for objects surviving Eden space garbage collection.
• Tenured Generation (Old Gen): Pool for objects that have persisted in survivor space for an extended period.

Non-Heap Memory

Non-heap memory includes memory required for internal VM processing and data that is not eligible for garbage collection. It consists of the following pools:

• Permanent Generation: Reflective data for the VM itself, including class and method objects.
• Code Cache (HotSpot VM only): Memory used for compilation and storage of native code.

Additional Information on JConsole

JConsole provides insights into the memory usage of Java applications. Refer to the official documentation for guidance on using this monitoring tool effectively.

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