https://blog.tjq.one/tags/linux/ Recent content in Linux on qq's blog https://blog.tjq.one/%3Clink%20or%20path%20of%20image%20for%20opengraph,%20twitter-cards%3E https://blog.tjq.one/%3Clink%20or%20path%20of%20image%20for%20opengraph,%20twitter-cards%3E Hugo en-us Thu, 06 Aug 2026 18:16:58 +0800 https://blog.tjq.one/posts/swap/ Thu, 06 Aug 2026 18:16:58 +0800 https://blog.tjq.one/posts/swap/ <p>swap 有两种主要形式，<strong>swap文件</strong> 和 <strong>swap分区</strong></p> <p>使用 <code>swapon -s</code> 或者 <code>swapon -show</code> 查看当前已启用 swap</p> <p><code>swapoff xxxx</code> 关闭swap</p> <h2 id="启用swap分区">启用swap分区</h2> <p>提前创建好sda2为swap分区</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span><span class="lnt">2 </span><span class="lnt">3 </span><span class="lnt">4 </span><span class="lnt">5 </span><span class="lnt">6 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">mkswap /dev/sda2 </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl">swapon /dev/sda2 </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl"><span class="c1"># 编辑fstab</span> </span></span><span class="line"><span class="cl">/dev/sda2 none swap defaults <span class="m">0</span> <span class="m">0</span> </span></span></code></pre></td></tr></table> </div> </div><h2 id="创建swap文件">创建swap文件</h2> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt"> 1 </span><span class="lnt"> 2 </span><span class="lnt"> 3 </span><span class="lnt"> 4 </span><span class="lnt"> 5 </span><span class="lnt"> 6 </span><span class="lnt"> 7 </span><span class="lnt"> 8 </span><span class="lnt"> 9 </span><span class="lnt">10 </span><span class="lnt">11 </span><span class="lnt">12 </span><span class="lnt">13 </span><span class="lnt">14 </span><span class="lnt">15 </span><span class="lnt">16 </span><span class="lnt">17 </span><span class="lnt">18 </span><span class="lnt">19 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl"><span class="c1"># 用三种方法创建都可以</span> </span></span><span class="line"><span class="cl">dd <span class="k">if</span><span class="o">=</span>/dev/zero <span class="nv">of</span><span class="o">=</span>/swapfile <span class="nv">bs</span><span class="o">=</span>1M <span class="nv">count</span><span class="o">=</span><span class="m">2048</span> </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl">fallocate -l 2G /swapfile </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl">mkswap -U clear --size 2G --file /swapfile </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl"><span class="c1"># 修改文件权限，避免其他用户误触</span> </span></span><span class="line"><span class="cl">chmod <span class="m">600</span> /swapfile </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl"><span class="c1"># 格式化为swap文件</span> </span></span><span class="line"><span class="cl">mkswap /swapfile </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl"><span class="c1"># 启动swap文件</span> </span></span><span class="line"><span class="cl">swapon /swapfile </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl"><span class="c1"># 添加到fstab</span> </span></span><span class="line"><span class="cl">/swapfile none swap defaults <span class="m">0</span> <span class="m">0</span> </span></span></code></pre></td></tr></table> </div> </div><h2 id="配置swappiness">配置swappiness</h2> <p>swappiness 数字越大表示越积极的把较少使用的匿名内存交换到swap</p> https://blog.tjq.one/posts/completion/ Wed, 05 Aug 2026 00:05:53 +0800 https://blog.tjq.one/posts/completion/ Linux 在 Bash 下的自动补全