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<!DOCTYPE html>
<html lang="en">
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<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
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<title>Article</title>
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积土而为山，积水而为海。
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<h1 class="article-title" itemprop="name">Linux设置Swap交换分区</h1>
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<i class="fa fa-calendar"></i> 2018-08-21
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<a class="article-category-link" href="/categories/Linux/">Linux</a>
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<i class="fa fa-eye" aria-hidden="true"></i> 23
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<p>有时，服务器上面程序跑多了，受限于内存不够，会出现程序被kill掉或者起不来的情况。</p>
<p>这个时候我们可以设置下Swap（交换分区）。Swap（交换分区），类似于 Windows 的虚拟内存，就是当内存不足的时候，把一部分硬盘空间虚拟成内存使用,从而解决内存容量不足的情况。</p>
<p>在设置 Swap 文件之前，有必要先检查一下系统里有没有既存的 Swap 文件。</p>
<p>如果返回的信息概要是空的，则表示 Swap 文件不存在。</p>
<p>这样就建立一个/tmp/swapfile的分区文件，大小为1G。</p>
<p>创建好 Swap 文件，还需要格式化后才能使用。运行命令：</p>
<figure class="highlight plain"><table><tbody><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">mkswap /tmp/swapfile</div></pre></td></tr></tbody></table></figure>
<p>如果要机器重启的时候自动挂载 Swap ，那么还需要修改 fstab 配置。</p>
<p>同时，我们还可以修改 Linux Swap 空间的 swappiness ，调整对硬盘的缓存。</p>
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