Java memory model and the relationship between memory and CPU

　　

The relationship between the main memory and the CPU, because the CPU is in the processing speed is too fast. So the general CPU has a CPU cache , which means the main memory---CPU cache---CPU Register---CPU execution processing, write the contrary.

See, is the multi-threaded case of the Java operation variables of the approximate steps, it should be noted that the variables of the multi-threaded operation is to get from the main memory is a copy of the variable , and then a series of operations, and another assignment to the main memory, so this situation will lead to the problem of inconsistent data in multi-threaded situations.

Java memory model and the relationship between memory and CPU