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<a href="/2023/10/14/io-uring-and-network-in-2023/" class="post-title-link" itemprop="url">io_uring and network in 2023</a>
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<time title="Created: 2023-10-14 21:43:18" itemprop="dateCreated datePublished" datetime="2023-10-14T21:43:18+08:00">2023-10-14</time>
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<time title="Modified: 2023-10-15 13:08:35" itemprop="dateModified" datetime="2023-10-15T13:08:35+08:00">2023-10-15</time>
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<p>原作者：<a target="_blank" rel="noopener" href="https://github.com/axboe">Jens Axboe</a></p>
<p>原文：<a target="_blank" rel="noopener" href="https://github.com/axboe/liburing/wiki/io_uring-and-networking-in-2023">github.com/axboe/liburing/wiki/io_uring-and-networking-in-2023</a></p>
<p>译者：<a target="_blank" rel="noopener" href="https://github.com/Codesire-Deng">等疾风</a></p>
<p>（本翻译已获得<a target="_blank" rel="noopener" href="https://github.com/axboe/liburing/discussions/960">原作者授权</a>。未经译者允许，请勿转载。）</p>
<h2 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h2><p>作为一个 IO 模型，io_uring 既适用于存储，也适用于网络。在 UNIX 中，人们经常吹捧“一切皆文件”。多数情况下这是对的，然而，一旦你需要对文件做 IO，所有的文件就不再众生平等，而是必须被区别对待。</p>
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<a href="/2022/10/24/Archlinux%E8%A3%85%E6%9C%BA%E7%AC%94%E8%AE%B0/" class="post-title-link" itemprop="url">Archlinux装机笔记</a>
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<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p><strong>重要数据·务必备份</strong>！固态硬盘报废，连带 Linux 无了，只能重装。恐将来也会频繁装机，故写一篇笔记，希望一劳永逸。</p>
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<a href="/2022/06/25/co-context-2/" class="post-title-link" itemprop="url">co_context[2]: 性能优化杂谈</a>
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<p>Hello，我是等疾风！本篇介绍在 <a target="_blank" rel="noopener" href="https://github.com/Codesire-Deng/co_context">co_context</a> 中用到的性能优化技巧，希望在各位 C/C++ 道友的项目上有所帮助。<strong>重点将在技巧的入门</strong>，而不是 co_context 本身。</p>
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<a href="/2022/06/25/co-context-1/" class="post-title-link" itemprop="url">co_context[1]: 易用性设计</a>
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<p><a target="_blank" rel="noopener" href="https://github.com/Codesire-Deng/co_context">co_context</a> 是最近开发的 C++ 异步协程框架，基于 Linux io_uring。<strong>「易用性」</strong>和「性能」是我们最重视的属性，这篇文章，我们介绍在 co_context 中有关易用性的设计。</p>
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<p><a target="_blank" rel="noopener" href="https://github.com/Codesire-Deng/co_context">co_context</a> 是最近开发的 C++ 异步协程框架，以<strong>易用性</strong>为最高目标，尽量兼顾<strong>性能</strong>。希望从此 C++ 的异步能比 Node.js 更简单，更优雅。</p>
<p>co_context 是基于 Linux io_uring，I/O 走内核态协议栈，这是 co_context 努力逼近的性能上限。</p>
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<p>最近开发 <code>co_context</code>，遇到了很多 C++ 周边的坑。其中一个坑是 intellisense 翻脸不认 C++17 标准的强制拷贝消除（Mandatory elision of copy/move operations）。</p>
<p>这个 intellisense 来自 Vscode Extention: C/C++ (Microsoft)。</p>
<h2 id="Brief-Solution"><a href="#Brief-Solution" class="headerlink" title="Brief Solution"></a>Brief Solution</h2><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">ifdef</span> __INTELLISENSE__</span></span><br><span class="line"><span class="comment">// The fake code to cheat intellisense...</span></span><br><span class="line"><span class="meta">#<span class="keyword">else</span></span></span><br><span class="line"><span class="comment">// The real code for compiler...</span></span><br><span class="line"><span class="meta">#<span class="keyword">endif</span></span></span><br></pre></td></tr></table></figure>
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<h1 id="Preface"><a href="#Preface" class="headerlink" title="Preface"></a>Preface</h1><p>要掌握 C++20 协程，仅仅看完文档是远远不够的。C++ 和其他语言的协程的最大不同点在于，C++ 提供了最少量的编译器实现和极大量的「可定制点」，而其他语言可能连「调度器」都给用户准备好了。</p>
<p>在茫茫多的可定制点面前，如果你能一眼看出「为什么 C++ 要这样设计」，那么我愿称你为天才。否则，还是从常见的范式下手，逐渐体会设计者的思想吧。</p>
<p>我们将从最简单的范式——Generator 下手。</p>
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<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">template</span><<span class="keyword">typename</span> Lambda></span><br><span class="line"><span class="keyword">struct</span> <span class="title class_">Defer</span> : Lambda {</span><br><span class="line"> ~<span class="built_in">Defer</span>() { Lambda::<span class="built_in">operator</span>()(); }</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">template</span><<span class="keyword">typename</span> Lambda></span></span><br><span class="line"><span class="function"><span class="title">Defer</span><span class="params">(Lambda)</span> -> Defer<Lambda></span>;</span><br></pre></td></tr></table></figure>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// usage</span></span><br><span class="line">Defer guard{[sockfd]{</span><br><span class="line"> <span class="built_in">shutdown</span>(sockfd, SHUT_WR);</span><br><span class="line">}};</span><br></pre></td></tr></table></figure>
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<h1 id="Preface"><a href="#Preface" class="headerlink" title="Preface"></a>Preface</h1><p>在研究 CRTP 时发现了一种经典应用——表达式模板。今天学一学，顺便水一篇博客。🐶</p>
<h1 id="Motivation-and-example"><a href="#Motivation-and-example" class="headerlink" title="Motivation and example"></a>Motivation and example</h1><p>表达式模板是一种模板元编程，它在编译期展开向量的一系列复合运算，从而将辅助空间从 $O(n)$ 降到 $O(1)$。相比于朴素算法，表达式模板属于惰性求值，求值时间点是赋值运算。</p>
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<h1 id="Preface"><a href="#Preface" class="headerlink" title="Preface"></a>Preface</h1><p>「多态」是一个很宽泛的理念，对应繁多实现。本文将记录我所看到的多态的各种形态。作者见识短浅，还请读者多多指教。</p>
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