将计算机置于休眠模式似乎总是比将其从休眠模式中恢复并继续工作来得快。为什么备份系统比关闭系统慢得多？

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Entrops很好奇：

Hibernation is supposed to write out RAM contents to disk, and coming back from hibernation is supposed to fill back RAM with saved contents. Why is coming back from hibernation slow, e.g. system is very unresp***ive in general for quite some time?

那么，让电脑从休眠状态恢复到底是一个如此缓慢的过程呢？

答案

超级用户贡献者wolfo9999解释道：

The main cause is disk I/O. Reading and writing to a physical disk is much slower than from RAM. When your computer resumes from disk (hibernation) it also has to power up the components which may cause some slowdown. This is highly dependent on the computer. A SSD will have almost the same resume speed from disk as from RAM. Some computers let you move the mouse around before the ram has been completely filled up again, causing low resp***e times.

Note: Assume you have 8GB of RAM and a SSD with 400MB/s throughput. It will still take 8*1024MB/400MB/s = 20.48s. This is not the same speed as resume from RAM.

Assuming a RAM throughput of 15,000MB/s, the resume time is 0.55 seconds.

他的回答中有一点没有涉及，那就是在休眠/恢复计算机的过程中，你在做什么，这肯定会影响你对时间的感知。通常，当你休眠你的电脑，你启动休眠，然后走开（是否需要20秒或2分钟并不重要，因为你很少在那里盯着它）。然而，当你恢复电脑时，你正坐在那里盯着它等着回去工作，所以30秒的恢复和1分钟的恢复之间的差别是非常显著的。

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