Memory Management.md

Memory Concepts in Java:

Memory Management is all about Garbage Collection i.e. GC in java

GC runs on Heap memory.

Heap Memory is bifurcated into following memory segments:

1. Young Generation
   • Eden Space
   • Survivor Space 1
   • Survivor Space 2
2. Old Generation

PremGen: MetaData information of classes was stored in PremGen (Permanent-Generation) memory type before Java 8.
PremGen is fixed in size and cannot be dynamically resized. It was a contiguous Java Heap Memory.

MetaSpace: Java 8 stores the MetaData of classes in native memory called 'MetaSpace'.
It is not a contiguous Heap Memory and hence can be grown dynamically which helps to overcome the size constraints.
This improves the garbage collection, auto-tuning, and de-allocation of metadata

Reference:

• https://stackoverflow.com/a/40899996/6842300