title: Xcode Instruments. What is the meaing of Virtual Memory? iPhone OS has no VM?
body: <p>I've been staring at the Memory Monitor in Instruments and I am scratching my had. Why is it displaying virtual memory? iPhone OS has no virtual memory. What does it mean?</p>
  
  <p>My concern is that I am getting memory warnings for my iPad app but the apps real memory never exceeds 70MB and the virtual memory never exceeds 180MB?</p>
  
  <p>Could someone please enlighten me?</p>
  
  <p>Cheers,<br>
  Doug</p>