Java Program Memory usage

One, memory use

Second, Java Runtime data regions

1. Program Counter:

The line number prompt for the byte code executed by the current thread.

2. Java Virtual machine stack:

Thread private, the same as the thread life cycle, save the base data type, if the thread requested a stack depth greater than the virtual machine allowed depth, will throw stackoverflowerror, if the extension can not request enough memory will throw OutOfMemoryError.

3. Local method Stack:

Similar to the role of the virtual machine stack, it is a native method service for virtual machines, and throws Stackoverflowerror and OutOfMemoryError exceptions

4. Java heap:

It is an area shared by each thread that holds an instance of the object. Java heap is the main area of Java Memory Manager (GC) management

5. Method Area:

Areas shared by each thread for storage: class information, constants, static variables, compiled code, and so on.

6, the operation of constant-rate pool:

Part of the method area

Java Program Memory usage