Jvm Memory Management Heap Stack Garbage Collection

Java garbage collection is the process by which java programs perform automatic memory management.

Jvm memory management heap stack garbage collection. In order to reclaim the space of heap memory an automatic memory management process called garbage collection is triggered by jvm. For each invoked method this is the conceptual structure which contains the method arguments local variables a hidden pointer to the context for the calling. Note that the jvm uses more memory than just the heap. Gc is meant for memory allocation problems where stack management is not.

In short a great course to learn about jvm memory garbage collection tuning the vm and avoiding memory leaks in java and highly recommend it to all java programmers. If allocation on the stack was not done in the stack way it would not be called a stack but heap. When java programs run on the jvm objects are created on the heap which is a portion of memory dedicated to the program. Sizes of stack and heap memory can be changed by specifying options to jvm.

For example java methods thread stacks and native handles are allocated in memory separate from the heap as well as jvm internal data structures. Jvm manages the heap memory by garbage collection. However in most jvm implementations it is handled as well a stack which by definition precludes garbage collection. A stack is created at the same time when a thread is created and is used to store data and partial results which will be needed while returning value for method and performing dynamic linking.

Understanding jvm memory model java memory management are very important if you want to understand the working of java garbage collection today we will look into memory management in java different parts of jvm memory and how to monitor and perform garbage collection tuning. The stack could be garbage collected. Garbage collection was invented in order to cope with the problem of allocating things on a heap i e. What we call the stack is the accumulation of method activation contexts.

Jvm provides control to developers to vary the size of heap memory according to requirement. In simple terms it frees the memory used by orphan objects i e objects that are no longer referenced from the stack directly or indirectly via a reference in another object to make space for new object creation. Though method area is logically a part of heap it may or may not be garbage collected even if garbage collection is compulsory in heap area. Such that you cannot predict which parts will be released first.

As per system configuration the size of heap memory may be fixed or variable.