title: how can JVM use more than 4gb of memory
body: <p>I have a request to install a Linux server (preferably Ubuntu 64bit server), 
  and Java (64 bit) on the following machine:</p>
  
  <ul>
  <li>Intel Core2Quad Q8200 - 2.33 GHz</li>
  <li>8gb DDR2 ram</li>
  <li>2x 320GB SATA HDD in soft RAID1 mirror (mirror)</li>
  </ul>
  
  <p>The problem is how to configure  system and Java  because I need JVM  to use more than 4gb of memory. </p>
  
  <p>It cannot be distributed on many virtual machines. There is data more than 4GB large
  and it has to be in memory because HDD is slow and performance is critical. </p>
  
  <p>This is a  configuration and performance question and I am  interested in comments if anyone has experience?</p>
  
  <p>thank you very much for helping me on this...</p>