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<a class="article-title" href="/2018/05/09/Epoll原理剖析与使用/">Epoll原理剖析与使用</a>
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Posted on <a href="/2018/05/09/Epoll原理剖析与使用/" class="article-date">
<time datetime="2018-05-09T03:01:28.941Z" itemprop="datePublished">May 9, 2018</time>
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我们都知道，在服务器开发中，一个需要处理大量网络连接的高性能服务器一般都会使用Epoll模型，本文将深度解析的epoll模型的秘密。
我们从以下几个方面对于epoll进行分析
select模型的缺点
epoll模型的原理
epoll的实际使用
一. select模型的缺点首先介绍一些select模型的使用流程：
将待监听fd加入fd_set
调用select获取活跃的fd
处理这些活跃的fd
在第二步调用select时会发生以下事情：
从用户空间将整个fd_set拷贝到内核空间
遍历整个fd_set,对于每个fd进行poll
将活跃的fd集合拷贝至用户空间
我们可以由此看出select模型在处理网络连接数很大时的缺陷：
大量的从用户态到内核态的copy操作
每...
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<h6 style="margin: 0;"><a href="/2018/05/09/Epoll原理剖析与使用/">Epoll原理剖析与使用</a></h6>
<span>May 9, 2018</span>
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