T9: Knowledge Tip Of The Day...
JVM Memory Management
Whenever you execute a java program, a separate memory area is
reserved for storing various parts of your application code which we call JVM
memory.
When a Java virtual machine runs a program, it needs memory to store many things
Heap area :
The heap area represents the runtime data area, from which the memory is allocated for all class instances and arrays, and is created during the virtual machine startup.
Method area and runtime constant pool :
Method area stores per-class structures such as the runtime constant pool; field and method data; the code for methods and constructors, including the special methods used in class, instance, and interface initialization.
JVM Stacks :
It holds local variables and partial results and plays a part in the method invocation and return.
Native method stacks :
Native method stacks is called C stacks; it support native methods (methods written in a language other than the Java programming language), typically allocated per each thread when each thread is created.
The size of native method stacks can be either fixed or dynamic.
PC registers :
Each of the JVM threads has its own program counter (pc) register. At any point, each of the JVM threads is executing the code of a single method, namely the current method for that thread.
When a Java virtual machine runs a program, it needs memory to store many things
Heap area :
The heap area represents the runtime data area, from which the memory is allocated for all class instances and arrays, and is created during the virtual machine startup.
Method area and runtime constant pool :
Method area stores per-class structures such as the runtime constant pool; field and method data; the code for methods and constructors, including the special methods used in class, instance, and interface initialization.
JVM Stacks :
It holds local variables and partial results and plays a part in the method invocation and return.
Native method stacks :
Native method stacks is called C stacks; it support native methods (methods written in a language other than the Java programming language), typically allocated per each thread when each thread is created.
The size of native method stacks can be either fixed or dynamic.
PC registers :
Each of the JVM threads has its own program counter (pc) register. At any point, each of the JVM threads is executing the code of a single method, namely the current method for that thread.
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