Allocation Hot Spot Comparison
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The wizard has the following additional steps:
- Select snapshots
The allocation hot spot comparison compares two snapshot files. In this step, you select the first
and the second snapshot file for the comparison. The combo boxes contain all snapshot
files that have been added
to the snapshot selector. The first and second snapshot files must be
different.
- Class selection
In this step, you choose for which class or package the comparison should be made.
By
default all classed are selected, you can restrict the class selection to a single
class or a single package.
- View parameters
In this steps you can select aggregation level, liveness mode and filtered classes handling, just as for the
allocation hot spots view.
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Each row in the allocation hot spot comparison has the following columns:
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the name of the allocation hot spot
-
the size in the second
snapshot file minus the size in the first snapshot file
-
the allocations in the second
snapshot file minus the allocations in the first snapshot file
The second column incorporates a bidirectional bar chart. Increases are painted in
red and to the right, while
decreases are painted in green and to the left. In the view
settings dialog you can choose whether you want this bar chart to display absolute changes or
the percentage of the change. The other value is displayed in parentheses. This setting
also
determines how this column is sorted.
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By default, only allocation hot spots that have changed from one snapshot file to the other
are displayed. You can change this behavior in the view
settings dialog.
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At the bottom of the allocation hot spot comparison is a view filter selector
that filters data for specific package or class names.