title: -verbose garbage collector interpretation
body: <p>I'm running jboss 5.1 and I get this GC data</p>
  
  <pre><code>34.098: [GC 197635K-&gt;91639K(236480K), 0.0356348 secs]
  37.139: [GC 217911K-&gt;100951K(239936K), 0.0541968 secs]
  37.194: [Full GC 100951K-&gt;97239K(304704K), 0.3325776 secs]
  38.602: [GC 214271K-&gt;97547K(285568K), 0.0488937 secs]
  41.395: [GC 220811K-&gt;111699K(304512K), 0.0334592 secs]
  42.734: [GC 235155K-&gt;115815K(304384K), 0.0208743 secs]
  43.722: [GC 239271K-&gt;115801K(303872K), 0.0166861 secs]
  44.373: [GC 241049K-&gt;118266K(304128K), 0.0106151 secs
  </code></pre>
  
  <p>can somebody explain when Full GC occurs why there is such small difference between before and after heap size shouldn't it be bigger when full GC. line before full GC is "normal" GC and it has this large difference (and small collection time?), I only noticed that timestamps for this two lines are very close</p>