随着更新，更强大的硬件和改进的操作系统，我们可以使用这些天，为什么它仍然需要像它一样长的时间来完全启动一台计算机了？

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户读者kosinix想知道为什么计算机不能立即完全启动：

Computers have been around for quite some time. So what is stopping us from making computers boot instantly like regular home appliances and other devices? Is it even possible? I know there are ‘Hibernate’ and ‘Sleep’ opti***, but those aren’t really ‘real boot’.

为什么计算机不能立即完全启动？有了现在更好、更强大的硬件，以及操作系统的不断改进，人们会认为计算机完全启动的速度会比现在快得多。

答案

超级用户贡献者ckhan为我们提供了答案：

Computers are state machines. The problem is that the initial condition the computer starts with (which is, literally, instant) is not very useful to you and me. (Even after the first electron moves.)

What is useful to you and me is many milli*** of steps further down that ‘state machine’. The easiest way for developers to describe that state is to define it in programs, and those programs will always take more than ‘zero time’ to run.

Now you might say: “Fine, but can’t you cache the ‘first-usable-state’ and start there?” And you could, and it does. It’s (roughly) what resume from ‘Sleep’ is, and which is why it’s not very fair, I think, to “exclude” resume from a discussion of improving boot times.

虽然开机时间在过去几年里肯定有所改善，并将随着时间的推移而继续改善，但确实如此，而且每次启动您喜爱的计算机时，都会有很多事情发生在“屏幕后面”。

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