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Getting Familiar with the GC Events Tab

The GC Events tab is divided into six sections (see Figure 6-1) that pictures how the garbage collector has performed during the recording.

Figure 6-1 The GC Events tab

The GC Events tab

The GC Events tab is divided into the following sections:

  1. GC Events Overview chart-this chart shows the entire recording in its full length (when you initially open your recording). You can use this to refocus the Heap Usage graph, see Changing Focus on Heap Usage Chart.
  2. Heap Usage graph-this graph shows heap usage compared to pause times and how that varies during the recording. If you have selected a specific area in the GC Events Overview, you will only see that section of the recording. You can change the graph content in the Heap Usage drop-down list (marked 6 in Figure 6-1) to get a graphical view of the references and finalizers after each old collection.
  3. Garbage Collections events-this list shows all garbage collection events that have taken place during the recording. When you click on a specific event, you will see a corresponding flag in the Heap Usage graph for that particular event, see Viewing Specifics about Garbage Collections.
  4. Details-this section contains all the details about the specific garbage collection round. When you select a garbage collection in the Garbage Collection list, the tabs in the Details section changes depending on if you have selected an old collection or a young collection.
  5. Chart Configuration-this section allows you to change the appearance on the active chart.
  6. Heap Usage-this list allows you to toggle the view on the Heap Usage chart to view References and finalizers. It shows different types of reference counts after each collection.
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