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        <p>Nginx是一款在高并发场景性能非常优越的web服务器，追究其高效的原因，就在于使用了<strong>I/O多路转接</strong>技术。I/O多路转接技术究竟为何？为什么其能承载万级的并发？接下来通过这篇文章对其进行详细的讲解。</p>
        
      
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    <article id="post-面试题-分布式系统" class="article article-type-post  article-index" itemscope itemprop="blogPost">
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<a href="/2020/03/10/%E9%9D%A2%E8%AF%95%E9%A2%98-%E5%88%86%E5%B8%83%E5%BC%8F%E7%B3%BB%E7%BB%9F/" class="archive-article-date">
  	<time datetime="2020-03-09T17:53:33.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-03-10</time>
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        <p>本文参考《大规模分布式存储系统-第三章.分布式系统》，对分布式系统相关的基础概念进行一个大致的讲解与总结，结合本人对于分布式的一点点理解，旨在为有意学习分布式系统的同学提供一点点帮助，同时也对自己的知识进行加深理解与巩固。详细的理论和概念还请直接阅读原文。</p>
        
      
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    <article id="post-面试题-延迟任务" class="article article-type-post  article-index" itemscope itemprop="blogPost">
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  	<time datetime="2020-03-08T16:36:33.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-03-09</time>
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        <p>在软件系统设计中，延时任务的需求比比皆是：客户端请求一定时间后自动断开；订单系统下单后一段时间执行操作；等等。本篇文章对如何实现一个高效且贴合实际场景的延时任务服务进行大致的讲解。</p>
        
      
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    <article id="post-面试题-进程间通信" class="article article-type-post  article-index" itemscope itemprop="blogPost">
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<a href="/2020/03/06/%E9%9D%A2%E8%AF%95%E9%A2%98-%E8%BF%9B%E7%A8%8B%E9%97%B4%E9%80%9A%E4%BF%A1/" class="archive-article-date">
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        <p>在上一篇文章<a href="https://wjj954628981.github.io/2020/03/02/面试题-进程、线程、协程/">面试题-进程、线程、协程</a>中，我们介绍了进程、线程和协程的概念。对于线程和协程而言，他们共享进程的内存空间，可以很简单进行通信；而对于进程而言，由于其独立的内存空间，无法进行直接通信，因此<strong>进程间通信（InterProcess Communication，IPC）</strong>尤为重要。</p>
        
      
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    <article id="post-面试题-进程、线程、协程" class="article article-type-post  article-index" itemscope itemprop="blogPost">
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<a href="/2020/03/02/%E9%9D%A2%E8%AF%95%E9%A2%98-%E8%BF%9B%E7%A8%8B%E3%80%81%E7%BA%BF%E7%A8%8B%E3%80%81%E5%8D%8F%E7%A8%8B/" class="archive-article-date">
  	<time datetime="2020-03-02T15:53:16.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-03-02</time>
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        <p>进程、线程、协程是操作系统实现并发的最基础的概念，也是面试必须掌握的知识。仅仅简单的对概念进行理解是比较简单的，但是要深入理解设计的本质及原理，则需要一系列相关的知识来辅助。接来下我们就进程、线程、协程的原理进行分析，并讨论其相关扩展概念。</p>
        
      
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        <p>锁是保证并发环境数据访问一致性、有效性非常重要的机制，也是面试题中必考问题之一。</p>
        
      
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        <p>在前面一篇文章<a href="https://wjj954628981.github.io/2020/02/25/Linux内存管理/">Linux内存管理-从操作系统角度看可执行文件的装载</a>中，我们通过一个可执行文件的运行装载过程中，深入了解了Linux内存的管理方式：分段、分页。内存分配的最小单位为页框，其大小为4k，对于需要频繁申请释放不同大小内存的进程（例如操作系统内核），必然导致在已分配页框的中分散了许多小块的空闲内存。下面我们来介绍两个策略，以便管理用于内核进程的空闲内存：<strong>伙伴系统</strong>和<strong>slab分配机制</strong>。</p>
        
      
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        <p>事务是面试题中必考问题之一。</p>
        
      
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        <p>一直以来有些疑惑：一个可执行文件，从开始执行到结束的过程中，操作系统究竟做了哪些操作。接下来，我将循序渐进地分析整个过程中发生了哪些事情。</p>
        
      
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        <p>HTTP协议是Hyper Text Transfer Protocol（超文本传输协议）的缩写，是用于从万维网（WWW:World Wide Web ）服务器传输超文本到本地浏览器的传送协议。</p>
        
      
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