在任何特定时间，有多少百分比的家用计算机处于唤醒状态？
如果我正在制作一个 p2p 文件共享应用程序，我需要知道必须在多少台普通家用计算机上复制文件才能使其几乎始终可用。有什么想法吗？
If I am making a p2p file sharing application, I need to know how many regular home computers must I replicate a file on for it to be ALMOST ALWAYS available. Any idea?
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这是很难评估的，因为这不仅是一个清醒的问题，也是一个可达性的问题，也是一个工作负载能力和带宽的问题。并不是因为 PC 拥有该文件并且它处于在线状态才能够传送该文件（特别是如果它是一个大文件）。
这种信息从理论上是无法猜测的。最好的方法是从您的实时系统中进行测量。但是，如果您确实需要一些估计，一般用户会在上午 7 点至 9 点之间打开电脑，并在晚上 20 点至 23 点之间关闭电脑，白天可能会休息几个小时。
您可能需要 Google 一下有关 P2P CHURN 的信息。有一些理论可以帮助您创建一些模型，但老实说，根据我的经验，没有什么比具体/真实数据更好的了。
It is very hard to evaluate, because it is not only a question of being awake, it is also a question of being reachable and of workload capacity and bandwidth. It is not because a PC has the file and that's it is online that it will be able to deliver the file (especially if it is a big file).
This kind of info is impossible to guess from a theoretical perspective. The best approach is to measure it from your live system. But, if you really need some estimation, an average user would open its PC between 7-9 AM and shut it down between 20-23 PM, with may be a couple of hours off during the day.
You may want to Google about P2P CHURN. There is some theory out there that could help you create some model, but honestly, in my experience, there is nothing like concrete/real data.