title: Linux more precise cpu usage
body: <p>I can get cpu usage percentage with ps command</p>
  
  <pre><code>ps -ax -o pid,rss,pcpu,command
  </code></pre>
  
  <p>But there are processes for which it prints 0.0. I know that the reason is because the value is too small. Is there any way (ps option for example) to print these values more precise like 0.002?</p>