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<article id="post-go2-type-parameters" class="post-go2-type-parameters post type-post status-publish format-standard hentry">
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<h1 class="entry-title">
<a class="article-title" href="/2020/07/13/go2-type-parameters/">go2_type_parameters</a>
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<p>2020/6/16，go团队发布了新的go泛型草案，用类型参数type parameters来限制或者说声明<br>对函数的传入参数的约束。</p>
<p>原文：<a href="https://go.googlesource.com/proposal/+/refs/heads/master/design/go2draft-type-parameters.md" target="_blank" rel="noopener">https://go.googlesource.com/proposal/+/refs/heads/master/design/go2draft-type-parameters.md</a><br>历史草案：<a href="https://go.googlesource.com/proposal/+/refs/heads/master/design/go2draft-contracts.md" target="_blank" rel="noopener">https://go.googlesource.com/proposal/+/refs/heads/master/design/go2draft-contracts.md</a><br>playground：<a href="https://go2goplay.golang.org/" target="_blank" rel="noopener">https://go2goplay.golang.org/</a><br>Go泛型讨论概要：<a href="https://docs.google.com/document/d/1vrAy9gMpMoS3uaVphB32uVXX4pi-HnNjkMEgyAHX4N4/view#" target="_blank" rel="noopener">https://docs.google.com/document/d/1vrAy9gMpMoS3uaVphB32uVXX4pi-HnNjkMEgyAHX4N4/view#</a></p>
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2020-07-13
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<article id="post-CPU-Cache总结" class="post-CPU-Cache总结 post type-post status-publish format-standard hentry">
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<a class="article-title" href="/2020/05/29/CPU-Cache%E6%80%BB%E7%BB%93/">CPU Cache总结</a>
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<h1 id="1-CPU缓存简介"><a href="#1-CPU缓存简介" class="headerlink" title="1. CPU缓存简介"></a>1. CPU缓存简介</h1><p>CPU缓存是介于内存与CPU之间的存储介质，速度上低于寄存器而高于RAM。</p>
<figure class="highlight plain"><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><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">|---------------------------------------------------------------|</span><br><span class="line">| |</span><br><span class="line">| L3 Cache(shared by all cores) |</span><br><span class="line">| |</span><br><span class="line">|----------------------------------------------------------------</span><br><span class="line">| | | | |</span><br><span class="line">| L2 Cache | L2 Cache | L2 Cache | L2 Cache |</span><br><span class="line">| | | | |</span><br><span class="line">|----------------------------------------------------------------</span><br><span class="line">| L1 instruction| L1 instruction| L1 instruction| L1 instruction|</span><br><span class="line">|---------------------------------------------------------------- </span><br><span class="line">| L1 Data | L1 Data | L1 Data | L1 Data |</span><br><span class="line">|----------------------------------------------------------------</span><br><span class="line">| | | | |</span><br><span class="line">| Core1 | Core2 | Core3 | Core4 |</span><br><span class="line">| | | | |</span><br><span class="line">|---------------------------------------------------------------|</span><br></pre></td></tr></table></figure>
<p>如上图所示,三级缓存里，L1通常包括指令缓存和数据缓存，L2、L3不分数据与指令缓存，并且L3为所有核心共享。<br>以下是三者速度的参照：</p>
<table>
<thead>
<tr>
<th align="center">Cache</th>
<th align="center">Lentency</th>
<th align="center">CPU cycles</th>
<th align="center">Size</th>
</tr>
</thead>
<tbody><tr>
<td align="center">L1</td>
<td align="center">~1.2ns</td>
<td align="center">4 cycles</td>
<td align="center">32KB~512KB</td>
</tr>
<tr>
<td align="center">L2</td>
<td align="center">~3ns</td>
<td align="center">10 cycles</td>
<td align="center">128KB~24MB</td>
</tr>
<tr>
<td align="center">L3</td>
<td align="center">~12ns</td>
<td align="center">40 cycles</td>
<td align="center">2MB~32MB</td>
</tr>
</tbody></table>
<p>引入缓存一般要考虑两种问题：<br> - 缓存命中率<br> - 缓存一致性</p>
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2020-05-29
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<article id="post-slice-or-slice-pointer" class="post-slice-or-slice-pointer post type-post status-publish format-standard hentry">
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<a class="article-title" href="/2020/05/25/slice-or-slice-pointer/">slice_or_slice_pointer</a>
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<p>论坛上经常看到有人提出切片传递用[]int好还是*[]int好的疑问，正好自己也对这个比较好奇，就借此研究下运行时具体有什么区别。</p>
<p>首先要了解一个常识：切片在runtime时是由一个包含地址、len、cap的结构体表示。</p>
<figure class="highlight golang"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">//definition in runtime/slice.go</span></span><br><span class="line"><span class="keyword">type</span> slice <span class="keyword">struct</span> {</span><br><span class="line"> array unsafe.Pointer</span><br><span class="line"> <span class="built_in">len</span> <span class="keyword">int</span></span><br><span class="line"> <span class="built_in">cap</span> <span class="keyword">int</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>这样按照Golang的调用约定func(s []int)应该会压入三个参数，但func(s *[]int)呢，是否会只压入指向切片结构体的指针，下面来通过编译出的汇编代码来验证。</p>
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2020-05-25
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<article id="post-string-byte-convert" class="post-string-byte-convert post type-post status-publish format-standard hentry">
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<a class="article-title" href="/2020/05/08/string-byte-convert/">string_byte_convert</a>
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<p>众所周知golang里切片由一个array/len/cap组成的结构体表示，而字符串是由len+addr表示。<br>今天看fiber源码里有两个相互转化的实现，借此探究下区别和具体运行时是如何处理的。</p>
<p>fiber的源码utils.go里有这样两个函数:</p>
<figure class="highlight go"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> getBytes = <span class="function"><span class="keyword">func</span><span class="params">(s <span class="keyword">string</span>)</span> <span class="params">(b []<span class="keyword">byte</span>)</span></span> {</span><br><span class="line"> <span class="keyword">return</span> *(*[]<span class="keyword">byte</span>)(unsafe.Pointer(&s))</span><br><span class="line">}</span><br><span class="line"><span class="keyword">var</span> getBytesImmutable = <span class="function"><span class="keyword">func</span><span class="params">(s <span class="keyword">string</span>)</span> <span class="params">(b []<span class="keyword">byte</span>)</span></span> {</span><br><span class="line"> <span class="keyword">return</span> []<span class="keyword">byte</span>(s)</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<article id="post-sync-atomic" class="post-sync-atomic post type-post status-publish format-standard hentry">
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<a class="article-title" href="/2020/01/18/sync-atomic/">sync/atomic</a>
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<p>最近学习到golang的sync/atomic包，对于其底层的实现原理十分感兴趣就看了其生成的汇编指令，<br>也便于了解究竟原子操作是如何保证的。</p>
<p>先看一段atomic相关的代码,add函数是把全局变量v原子性地加上了a的值。</p>
<figure class="highlight go"><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><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> main</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> (</span><br><span class="line"> <span class="string">"fmt"</span></span><br><span class="line"> <span class="string">"sync/atomic"</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> v <span class="keyword">int64</span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">add</span><span class="params">(a <span class="keyword">int64</span>)</span></span> {</span><br><span class="line"> atomic.AddInt64(&v, a)</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> {</span><br><span class="line"> fmt.Scanln(&v)</span><br><span class="line"></span><br><span class="line"> <span class="keyword">go</span> add(<span class="number">12</span>)</span><br><span class="line"> <span class="keyword">go</span> add(<span class="number">34</span>)</span><br><span class="line"></span><br><span class="line"> fmt.Println(v)</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<a class="article-title" href="/2020/01/17/removeFromSlice/">Golang移除slice中的某个元素</a>
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<p>最近刷leetcode遇到个移除切片中某个元素的需求，第一反应是遍历切片然后append下去。<br>但这样需要另外等同大小的空间。能在原切片上操作肯定是最好的。</p>
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