title: On Linux: We see following: Physical, Real, Swap, Virtual Memory - Which should we consider for sizing?
body: <p>We use a Tool (Whats Up Gold) to monitor memory usage on a Linux Box.
  We see Memory usage (graphs) related to:</p>
  
  <p>Physical, Real, Swap, Virtual Memory and ALL Memory (<em>which is a average of all these</em>).</p>
  
  <pre><code>'The ALL' Memory graphs show low memory usage of about: 10%. 
  But Physical memory shows as 95% used.
  Swap memory shows as 2% used.
  </code></pre>
  
  <p>So, do i need more memory on this Linux Box? 
  In other words should i go by:</p>
  
  <ul>
  <li>ALL Memory graph(which says memory situation is good) OR </li>
  <li>Physical Memory Graph (which says memory situation is bad). </li>
  </ul>