/tags/zsh/ Recent content in Zsh on galvanist Hugo en Fri, 15 Nov 2013 23:08:00 +0000 /posts/2013-11-15-revisiting-shell-concurrency-this-time-in-zsh/ Fri, 15 Nov 2013 23:08:00 +0000 /posts/2013-11-15-revisiting-shell-concurrency-this-time-in-zsh/ <p>I&rsquo;ve been thinking about <a href="http://galvanist.com/post/51134915590/managed-concurrency-in-the-bash-shell">concurrency in the command shell</a> again. This was prompted by my ongoing transition from Bash to ZSH. I&rsquo;ve decided to re-implement my <code>conc</code> and <code>xconc</code> functions in a slightly different way.</p> <h2 id="intro">Intro</h2> <p>Lets say you have 50 data files to compress. Here&rsquo;s one way:</p> <pre tabindex="0"><code>% xz *.dat &lt;&lt; completed in 2 minutes, 4 seconds &gt;&gt; % </code></pre><p>That&rsquo;s not bad, but it doesn&rsquo;t really take advantage of all those fancy cores we have in our computers these days. Let&rsquo;s run multiple <code>xz</code> jobs as-parallel-as-possible, so that each file gets its own <code>xz</code> process.</p>