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<!DOCTYPE html>
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<title>DY.Feng's Blog 叶毅锋的博客</title>
<meta name="description" content="在Linux下做一个简单的秒表 Sep 1st, 2012 Tags: stopwatch, linux, bash 因为要比较clang和gcc哪个编译效率更高，我把我的一个项目分别用这两种编译器编译，还比较了添加-j4后的编译时间。可我的apt-get仓库下没发现有什么好的秒表或者计时器， …" />
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<header class="my-nickname"><em title="">(≧▼≦) 喵喵</em></header>
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<h1 class="entry-title"><a href="/2012/09/01/stopwatch-in-linux/">在Linux下做一个简单的秒表</a></h1>
<p class="meta">
<time datetime="2012-09-01T10:00:00+08:00" pubdate="pubdate" data-updated="true">Sep 1<span>st</span>, 2012</time>
<span class="tags">
Tags:
<a href='/tags/stopwatch/'>stopwatch</a>, <a href='/tags/linux/'>linux</a>, <a href='/tags/bash/'>bash</a>
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<div class="entry-content typo"><p>因为要比较<code>clang</code>和<code>gcc</code>哪个编译效率更高，我把我的一个项目分别用这两种编译器编译，还比较了添加<code>-j4</code>后的编译时间。可我的<code>apt-get</code>仓库下没发现有什么好的<code>秒表</code>或者<code>计时器</code>，有的计时器是用来定时执行任务的。不过山人自有妙计，我用一行命令也做了一个秒表，Linux下没有不可能的事情。</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ time read -n1</span></code></pre></td></tr></table></div></figure>
<p>结束后按回车，就能看到运行时间了，而且还精确到0.002秒哦亲。话说回来，clang比gcc没快多少，差不多的样子而已。加了<code>j4</code>，效率也没有提高4倍，加之前36秒，加之后25秒的样子，当然这个还得具体看项目的依赖关系。</p>
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<article>
<header>
<h1 class="entry-title"><a href="/2012/08/24/something-about-nginx-configuration/">关于nginx的一些配置</a></h1>
<p class="meta">
<time datetime="2012-08-24T01:10:00+08:00" pubdate="pubdate" data-updated="true">Aug 24<span>th</span>, 2012</time>
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Tag:
<a href='/tags/nginx/'>nginx</a>
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</header>
<div class="entry-content typo"><p>今天帮人配置了下nginx，主要是二级域名以对应文件夹为根目录。主要的问题是在<code>Windows</code>环境下配置的，而小生一直都是在<code>Linux</code>环境下工作的，对<code>Windows</code>不大了解，记录下今天学到的小技巧。</p>
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<h1 class="entry-title"><a href="/2012/08/23/menu-does-not-popup-and-right-click-does-not-work-in-firefox/">解决Firefox菜单不弹出和右键失效的问题</a></h1>
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<time datetime="2012-08-23T13:19:00+08:00" pubdate="pubdate" data-updated="true">Aug 23<span>rd</span>, 2012</time>
<span class="tags">
Tags:
<a href='/tags/firefox/'>firefox</a>, <a href='/tags/ubuntu/'>ubuntu</a>, <a href='/tags/fcitx/'>fcitx</a>, <a href='/tags/kde/'>kde</a>
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<div class="entry-content typo"><p>最近一次kubuntu升级后，我发现一个很奇怪的现象，我的Firefox某些时候菜单栏不能弹出，右键也失灵了。准确来说，是弹出了，又很快地焦点转移，导致他又关闭了。Google下发现遇到这个问题的童鞋还真不少，而且解决的方法各有不同，看来这个问题是Firefox一直存在的。</p>
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<h1 class="entry-title"><a href="/2012/08/18/change-the-pygment-lexer-of-octopress/">修改octopress的pygment语法</a></h1>
<p class="meta">
<time datetime="2012-08-18T18:43:00+08:00" pubdate="pubdate" data-updated="true">Aug 18<span>th</span>, 2012</time>
<span class="tags">
Tags:
<a href='/tags/octopress/'>octopress</a>, <a href='/tags/pygement/'>pygement</a>, <a href='/tags/python/'>python</a>, <a href='/tags/regular-expression/'>regular expression</a>, <a href='/tags/lexer/'>lexer</a>
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<div class="entry-content typo"><p>最近我在写一篇关于Git使用的文章，里面贴了大量<code>bash</code>命令。我的语法高亮是用Octopress自带的<code>pygements.rb</code>，用起来总觉得不大爽，因为他高亮的地方实在是太少了，只有少量的命令有高亮。自己动手丰衣足食，下面记录我修改的过程：</p>
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<h1 class="entry-title"><a href="/2012/08/12/all-about-git/">Git深入浅出学习</a></h1>
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<time datetime="2012-08-12T00:38:00+08:00" pubdate="pubdate" data-updated="true">Aug 12<span>th</span>, 2012</time>
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<div class="entry-content typo"><p>在看这篇文章之前…</p>
<ul>
<li><p>如果你只是在找Git的使用命令，而不是想深入学习Git，请绕道。</p>
<p>Git和Linux一样，不是学几个命令就能理解到他的精髓的。</p></li>
<li><p>什么？你在Windows下？那你一定懂Cygwin了。不知道Cygwin？那你看这篇文章就有点吃力了。还不会用命令行？那你可以绕道了，这篇文章对你来说是天书。</p></li>
<li><p>请先忘记你之前所了解关于Git的一切，因为网络上的文章有99%都是以纰传纰的！！</p></li>
<li><p>请先忘记你所有学的其他版本管理系统。</p>
<p>请统统忘记<code>Svn</code>、<code>Cvs</code>、<code>Mercury</code>等，因为Git的思想跟实现跟他们有天大的区别！！</p></li>
<li><p>请不要急于求成，网上99%速成的教程都是有速度没质量的。</p>
<p>我不是说他们写的质量差，而是因为很多东西他都给简化掉了，让人有个错觉：这个很简单。其实这是不利于学习的。</p></li>
<li><p>请先从<code>最基础</code>的学起，而不是直接看操作命令，否则你只会只其然而不知其所以然，最后看到一头雾水。</p></li>
<li><p>我一开始将不会讲解任何关于使用Git的命令，而是先讲解Git的<code>底层原理</code>，如果你耐不住性子的请不要看。但我相信，这会是最快入门Git的方法之一。</p></li>
<li><p>你大概需要几天时间来消化和试验，所以不用急，慢慢看。反正你都误用了这么长时间了，花点时间来正确认识Git还是值得的。</p></li>
</ul>
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<h1 class="entry-title"><a href="/2012/08/12/bash-completion-for-rake/">为rake添加命令补全</a></h1>
<p class="meta">
<time datetime="2012-08-12T00:32:00+08:00" pubdate="pubdate" data-updated="true">Aug 12<span>th</span>, 2012</time>
<span class="tags">
Tags:
<a href='/tags/linux/'>linux</a>, <a href='/tags/bash/'>bash</a>, <a href='/tags/completion/'>completion</a>, <a href='/tags/rake/'>rake</a>
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</header>
<div class="entry-content typo"><p>为了用上Octopress，最近我没有少跟rake打交道。不过用起来始终有点不爽–命令补全没有了，没有make用得那么爽。虽然用<code>rake -T</code>可以列出所有的任务，但是始终没有一个Tab键补全方便。</p>
<p>幸亏觉得不方便的不止我一个人，Google了下，发现已经有人写出了基于bash-completion的<a href="http://turadg.aleahmad.net/2011/02/bash-completion-for-rake-tasks/">补全插件</a>，还带缓存的。</p>
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<h1 class="entry-title"><a href="/2012/08/12/using-octopress-as-github-blog/">Using Octopress as Github Blog on Ubuntu 12.04</a></h1>
<p class="meta">
<time datetime="2012-08-12T00:00:00+08:00" pubdate="pubdate" data-updated="true">Aug 12<span>th</span>, 2012</time>
<span class="tags">
Tags:
<a href='/tags/github/'>github</a>, <a href='/tags/octopress/'>octopress</a>
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<div class="entry-content typo"><p>本来我的Github blog是使用<code>Jekyll-Bootstrap</code>作为生成引擎。不过他是把文章发给Github解析的，由于Github出于安全考虑，限制ruby脚本的运行，这样就导致很多功能实现不了。这时候我发现了<code>Octopress</code>引擎，他把你的branch分成两个，一个master，负责放置静态的页面，一个是source，放置程序本身和Markdown日志。</p>
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<h1 class="entry-title"><a href="/2012/08/11/first-post-on-github/">First Post on Github</a></h1>
<p class="meta">
<time datetime="2012-08-11T00:00:00+08:00" pubdate="pubdate" data-updated="true">Aug 11<span>th</span>, 2012</time>
<span class="tags">
Tag:
<a href='/tags/github/'>github</a>
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</header>
<div class="entry-content typo"><p>Included file ‘JB/setup’ not found in _includes directory</p>
<p>终于出炉了！！这是我第一篇用github做blog的文章！！小生愚钝，在Win7下弄了4个小时才弄出来。遇到了cygwin和gem不兼容、gem源被墙、jekyll在Win7下各种奇怪的症状…得感叹下在Windows下生活的孩子不容易吖。</p>
<p>因为在Windows下操作，入乡随俗地下载了个Github的Windows客户端，那界面很炫，很有Win8 feel，难道这就是传说中的WinForm。可惜就是push的时候太慢了点，感觉要比命令行下要慢半拍。而且他在界面里不叫push，叫sync，这个名词更容易让人理解。</p>
<p>下面是各种华丽的Markdown测试</p>
<pre class="prettyprint">
require 'redcarpet'
markdown = Redcarpet.new("Hello World!")
puts markdown.to_html
</pre>
<pre class="prettyprint">
##大标题
###小标题
####小小标题
#####小小小标题
######你还能再小点不
#######其实我能一直地小，只是css没有定义到了
</pre>
<h2>大标题</h2>
<h3>小标题</h3>
<h4>小小标题</h4>
<h5>小小小标题</h5>
<h6>你还能再小点不</h6>
<h6>#其实我能一直地小，只是css没有定义到了</h6>
<pre class="prettyprint">
*强调一下*
**再强调一下**
***我次次强调我容易吗我***
</pre>
<p><em>强调一下</em></p>
<p><strong>再强调一下</strong></p>
<p><strong><em>我次次强调我容易吗我</em></strong></p>
</div>
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<header>
<h1 class="entry-title"><a href="/2012/08/11/decrease-threads-with-xampp/">减少xampp内存占用</a></h1>
<p class="meta">
<time datetime="2012-08-11T00:00:00+08:00" pubdate="pubdate" data-updated="true">Aug 11<span>th</span>, 2012</time>
<span class="tags">
Tags:
<a href='/tags/linux/'>linux</a>, <a href='/tags/xampp/'>xampp</a>, <a href='/tags/apache/'>apache</a>, <a href='/tags/moodle/'>moodle</a>
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</header>
<div class="entry-content typo"><p>最近有个改写moodle系统插件的项目，所以我又重操起php的老行当。moodle是一个非常不错的考试系统，多种题型，多种计分方式，唯一的缺点就是文档太少，非常的缺…开发人员列表里面也看到了好几个中国人的名字。</p>
<p>下载，放到htdocs，<code>sudo lampp start</code>，结果发现他竟然要求php5.3以上。我的php还是5.1的老版本，那没法，唯有下载个最新的xampp吧。一切还算顺利，除了xampp好像怪怪的。因为我改了配置文件后，再重启，他竟然好像没有反应，这个到现在还是个不解之谜。</p>
<p>在开发的过程中，我还发现电脑卡了很多，<code>ps -A|grep httpd</code>一看，哇的一刷。内存给我用了几百兆了，虽然我有4G也不是这样浪费的嘛，我只是开发而已，没有必要开这么线程。下面记录一下给xampp减少线程的方法。</p>
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