title: What memory usage threshold when I receive memory warning in iOS
body: <p>I did receive these warnings in my iOS app</p>
  
  <pre><code>Received memory warning. Level=1
  Received memory warning. Level=2
  </code></pre>
  
  <p>The problem is, after Level=2 warning, my app will be killed...
  How many MB of memory my app could use until I receive such warnings? I'm getting &lt; 30Mb of "Live Bytes" in XCode Instruments before my app gets killed for level 2 memory warning. Is this my reading mistakes, or am I not suppose to use more than 30Mb of memory in my app?</p>
  
  <p>I am testing using iPod Touch 4th Gen and iPhone 4, and targeting those devices as minimum.</p>
  
  <p>Any advice are appreciated, and thanks in advance!</p>