Java-100 Advanced -JVM Tian knowledge memory - Knowledge Shop (III)

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Java Memory Model (JMM)

JVM memory model is the JVM memory partition

Java memory model is a virtual machine specification

1.  Jvm memory according to the operational state and when the divided memory specifications

1. Java memory area
   
   2.1 ** ** thread-safe
   
   2.1.1 Program Counter
   
   2.1.2 virtual machine stack
   
   2.1.3 Native Method
   
   2.2 thread safe
   2.2.1 Method zone
   
   2.2.2 heap contained in the following figure
   
   2.2.3 heap memory division
   

to sum up:

1. Calculator program is not the only area OOM
2. Gc heap is the main place of
3. Thread-safe zones: virtual machine stack, local method, the program counter
4. Non-thread-safe zones: zone method, heap
5. Heap: divided into Eden, From Survivor, To Survivor

6. Heap: district ratio: 8: 1: 1

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