Happens-Before 并不是说前面一个操作发生在后续操作的前面，它真正要表达的是：前面一个操作的结果对后续操作是可见的

缓存技术蕴含的是空间换时间的思想；压缩体现的是时间换空间的思想；分布式思想也最初体现在 CPU 的设计和实现上

普通磁盘的寻道时间是 10ms 左右，而相比于磁盘寻道花费的时间，CPU 执行指令和内存寻址的时间都在是 ns（纳秒）级别，从千兆网卡上读取数据的时间是在μs（微秒）级别

某些层次负责的是对下层不同实现的抽象，从而对上层屏蔽实现细节。比方说 VFS 对上层（系统调用层）来说提供了统一的调用接口，同时对下层中不同的文件系统规约了实现模型，当新增一种文件系统实现的时候，只需要按照这种模型来设计，就可以无缝插入到 Linux 文件系统中

分层架构可以让我们更容易做横向扩展。如果系统没有分层，当流量增加时我们需要针对整体系统来做扩展。但是，如果我们按照上面提到的三层架构将系统分层后，那么我们就可以针对具体的问题来做细致的扩展

分层架构需要考虑的另一个因素，是层次之间一定是相邻层互相依赖，数据的流转也只能在相邻的两层之间流转

导致可见性的原因是缓存，导致有序性的原因是编译优化，那解决可见性、有序性最直接的办法就是禁用缓存和编译优化

Java 内存模型在 1.5 版本对 volatile 语义进行了增强。怎么增强的呢？答案是一项 Happens-Before 规则

Java 内存模型规范了 JVM 如何提供按需禁用缓存和编译优化的方法

final 修饰变量时，初衷是告诉编译器：这个变量生而不变，可以可劲儿优化

“同一时刻只有一个线程执行”这个条件非常重要，我们称之为互斥。如果我们能够保证对共享变量的修改是互斥的，那么，无论是单核 CPU 还是多核 CPU，就都能保证原子性了。

一个或者多个操作在 CPU 执行的过程中不被中断的特性，称为“原子性”

使用 watch 选项允许我们执行异步操作 (访问一个 API)，限制我们执行该操作的频率，并在我们得到最终结果前，设置中间状态。这些都是计算属性无法做到的

如果 <navigation-link> 没有包含一个 <slot> 元素，则该组件起始标签和结束标签之间的任何内容都会被抛弃。

计算属性是基于它们的响应式依赖进行缓存的。只在相关响应式依赖发生改变时它们才会重新求值。这就意味着只要 message 还没有发生改变，多次访问 reversedMessage 计算属性会立即返回之前的计算结果，而不必再次执行函数

组件是可复用的 Vue 实例，所以它们与 new Vue 接收相同的选项，例如 data、computed、watch、methods 以及生命周期钩子等。仅有的例外是像 el 这样根实例特有的选项

A full beard looks cool.

I think the legacy we leave is our family. I don't think it's money. I don't think it's - I'm not saying that charity isn't a great thing. I just think that it's my family. Even now I look and I think, God, I'm lucky if I lost it all.

The king is full of kindnesses toward me, and I love him tenderly. But it is pitiable to see his weakness for Madame du Barri, who is the silliest and most impertinent creature that it is possible to conceive.

I'd already started directing short films when we were doing 'Lord of the Rings,' then videogame projects.

It used to be you needed to have a very large sophisticated state before you could even have a nuclear weapon... Now the technology is widespread enough. It doesn't take very many people to be able to cobble together a devastating attack, and all it takes is one.

We produce destructive people by the way we are treating them in childhood.

My goal is that we should have a rich engagement online that caters to a general and scholarly audience and that can provide a seamless experience for people, whether they are up the road or on the other side of the world.

When you title yourself, you immediately lend yourself to all kinds of pretension.

If the work is poor, the public taste will soon do it justice. And the author, reaping neither glory nor fortune, will learn by hard experience how to correct his mistakes.

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The two best rules for a system of rhetoric are: first, have something to say; and next, say it.

What I think happens, and that you have to acknowledge though, is that a director uses a book as a launching pad for his own work and that's always very flattering.

'Sugar Cane Alley' had a lot of international success, big success everywhere.

I think as an actress, I prefer having a character on the page. It allows you to be more invested in actually creating a whole person. It's easier when you're not trying to come up with your next line on the spot.

It's also helpful to realize that this very body that we have, that's sitting right here right now… is exactly what we need to be fully human, fully awake, fully alive.

One key to success is demanding more than adequacy, never settling for good enough and always doing a little bit more.

To travel is to live.

I'm a comic nerd. I'm a former serious collector for much of my childhood and early teen years I wanted to draw underground comics.

I always say when it comes to dream matches, that is not up to me: that's up to the WWE Universe. That's up to the fans. But there is a guy on 'SmackDown' that I have yet to wrestle yet that's certainly gonna happen at some point, and that's Randy Orton.

My earliest attempts at writing were when I was seven. I would sit at the piano and transcribe the songs I heard on the radio. I'd change little things in the music and write different lyrics.

Memories fall apart too. And then youre left with nothing left not even with a ghost but with its shadow.

Not everyone deserves to know the real you. Let them criticize who they think you are.

A dress is a piece of ephemeral architecture, designed to enhance the proportions of the female body.

I've lived the American dream.