Viewing Information on the Common Garbage Collection Tab

The Common tab (Figure 9-8) displays information such as start time and end time of the garbage collection.

Sum of Pauses-the sum of all pause times in milliseconds that the garbage collector stops all threads in JRockit. This is not the same as end time-start time in the case of a concurrent garbage collector.
Start/End Time-the times when the garbage collection started and ended, counted in milliseconds from when JRockit started.
Heap Usage Before/After-the used heap size before or after the garbage collection.
Committed Heap Size-the total size of the heap (used plus unused memory) after the garbage collection.
Size of Promoted Objects (and number of Promoted Objects)-the size (and the amount) of the objects that have been promoted to the old space.
References-there are several types of references collected during a recording. For information on what a reference is, see Viewing Reference Objects in the Diagnostics Guide.
Finalizer Queue Length (and Before)-the finalizer queue length.
Generation-Indicates whether the garbage collector performed an old or young collection (see Generational Garbage Collection in the Diagnostics Guide for more information on generational garbage collection). If a parallel garbage collector has been used, there will be only old collections in the Garbage Collections list.