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According to https://download.oracle.com/otn-pub/jcp/memory_model-1.0-pfd-spec-oth-JSpec/memory_model-1_0-pfd-spec.pdf, giving a formal definition of Java Memory Model.
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content: 对于 Java 来说，你可以把 JMM 看作是 Java 定义的并发编程相关的一组规范，除了抽象了线程和主内存之间的关系之外，其还规定了从 Java 源代码到 CPU 可执行指令的这个转化过程要遵守哪些和并发相关的原则和规范，其主要目的是为了简化多线程编程，增强程序可移植性的。
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JMM(Java内存模型)主要定义了对于一个共享变量，当另一个线程对这个共享变量执行写操作后，这个线程对这个共享变量的可见性。
要想理解透彻 JMM（Java 内存模型），我们先要从 **CPU 缓存模型和指令重排序** 说起！
## 从 CPU 缓存模型说起