title: Explanation about logcat?
body: <p>I print logcat to see duration of process in app. I wonder the line of information. I have read <a href="https://developer.android.com/studio/command-line/logcat.html" rel="nofollow noreferrer">link</a>. But no clear explanation about this.</p>
  
  <pre><code>01-12 14:54:35.789 20802-21237/com.test.myapp E/Compare end: END
  01-12 14:54:35.799 20802-21237/com.test.myapp E/Compare Start: START
  </code></pre>
  
  <p>My question is what number <strong>20802-21237</strong> mean?</p>