epoll VS选择 [英] epoll VS select

问题描述

我已经阅读了几本网络书籍，以了解epoll和select之间的区别，但是它们仅涵盖了这一概念.如果你们能为我提供细节方面的关键差异，我将不胜感激.

I have read a couple of networking books to get some idea of differences between epoll and select but they only covered this concepts slightly. I will be appreciated if you guys can provide me the key differences in details.

预先感谢

推荐答案

select是用于执行异步IO的标准Unix工具.它的编程接口很古怪，在大多数Unix中，它的实现充其量只是中等水平.它还对进程可以监视的描述符的最大数量施加了限制，这在应用程序中很不方便.关于效率，select的性能通常随描述符的数量线性下降.

select is the standard Unix facility for doing asynchronous IO. Its programming interface is quirky, and its implementation in most Unixes is mediocre at best. It also imposes a limit on the maximum number of descriptors a process can watch, which is inconvenient in an application. Regarding efficiency, the performance of select usually degrades linearly with the number of descriptors.

epoll是对select的巨大改进，但仅在2.6版及更高版本的Linux中提供.其他Unix也有专门的调用.

epoll is a huge improvement over select in terms of programming interface and efficiency, but is only provided in Linux starting from version 2.6. Other Unixes have their specialised calls, too.

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