title: XCode 5 Debug Navigator Memory disagrees with Instruments
body: <p>I'm working on my first ARC &amp; Core Data project, basing this stage on Xcode's (Universal) Master-Detail template.
  I note that Xcode5 has a memory display in the Debug Navigator but when using it find its graph bears few similarities with mem usage displayed in Instruments when running a Leaks&amp;Allocations trace. 
  I've done the Instruments tracing with the Simulator (simulating both iPhone &amp; iPad - in case the 'unloading' of the detail View with the latter makes a difference) and on an iPad2 &amp; an iPodTouch. The results are broadly the same:</p>
  
  <blockquote>
    <p>iPhone 6.1 simulator</p>
    
    <ol>
    <li>Generation A--------1.13 MB</li>
    <li>Generation B--------397.70 KB</li>
    <li>Generation C--------76.96 KB</li>
    <li>Generation D--------11.70 KB</li>
    <li>Generation E--------1.56 KB   </li>
    <li>Generation F--------3.48 KB</li>
    </ol>
    
    <p>an overall growth of c30%</p>
  </blockquote>
  
  <p>where Generation A shows the growth to the loading of the Master table, and each successive Generation the growth after the Detail view has been <em>visited</em>  and <em>interacted with</em> (entailing the <em>fetching of NSManagedObjects</em> and the <em>creation of NSObjects</em>, respectively).
  The growth trend with the other devices was broadly similar (with the Generation A growth being iPad sim:1.42; iPad2:1.57; iPodTouch:0.94 but tailing off similarly).</p>
  
  <p>According to the Debug Navigator, however, the <strong><em>total</em></strong> usage at each point comes out at:</p>
  
  <blockquote>
    <p>iPhone 6.1 Debug Navigator</p>
    
    <ol>
    <li>Generation A--------4.2 MB</li>
    <li>Generation B--------6.9 MB--growth 2.7</li>
    <li>Generation C--------7.1 MB--growth 0.2</li>
    <li>Generation D--------7.8 MB--growth 0.7</li>
    <li>Generation E--------8.0 MB--growth 0.2    </li>
    <li>Generation F--------8.4 MB--growth 0.4<br>
    an overall growth of 100%!</li>
    </ol>
  </blockquote>
  
  <p>Referring to other similar questions, I don't have Zombies enabled. 
  Have others seen such discrepancies? Am I right in being inclined to trust Instruments over the Debug Navigator's summary figure?</p>
  
  <p>PS. Debug Navigator's summary figure doesn't seem to be available when running the real devices (both on versions of iOS5). Is this normal? </p>