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Snailclimb merged 1 commit into from
Oct 27, 2022
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Update jmm.md #1853

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2 changes: 1 addition & 1 deletion docs/java/concurrent/jmm.md
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Expand Up @@ -18,7 +18,7 @@ head:

**为什么要弄一个 CPU 高速缓存呢？** 类比我们开发网站后台系统使用的缓存（比如 Redis）是为了解决程序处理速度和访问常规关系型数据库速度不对等的问题。 **CPU 缓存则是为了解决 CPU 处理速度和内存处理速度不对等的问题。**

我们甚至可以把 **内存可以看作外存的高速缓存**，程序运行的时候我们把外存的数据复制到内存，由于内存的处理速度远远高于外存，这样提高了处理速度。
我们甚至可以把 **内存看作外存的高速缓存**，程序运行的时候我们把外存的数据复制到内存，由于内存的处理速度远远高于外存，这样提高了处理速度。

总结：**CPU Cache 缓存的是内存数据用于解决 CPU 处理速度和内存不匹配的问题，内存缓存的是硬盘数据用于解决硬盘访问速度过慢的问题。**

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