title: forrtl: No space left on device
body: <p>My simulations stop with <code>forrtl: No space left on device</code> error.</p>
  
  <p>When I use <code>ls --sort=size -alh</code>, it will report total of 96M and max of 60M usage. <br>
  When I use <code>du -h</code>, it will report total of 159G and max of 158G (for the same folder) <br>
  When I use <code>df -h</code>, it will report:</p>
  
  <pre><code>Filesystem                     Size  Used Avail Use% Mounted on
  </code></pre>
  
  <p><code>/dev/nvme0n1p4                 930G  883G     0 100% /</code></p>
  
  <p>Initially, I thought that there are huge number of hidden files that are taking space. I tried to remove hidden files as explained <a href="https://stackoverflow.com/questions/5061638/how-do-you-recursively-delete-all-hidden-files-in-a-directory-on-unix">here</a>.
  However, I got the same result. I was wondering how I can find the space-consuming items to remove/delete them.</p>