Memory Statistics view

The Memory Statistics views displays statistics about the application heap. It provides detailed information such as the number of classes loaded, the number of instances that are alive, and the memory size allocated by every class. Memory statistics are available at the package, class, and instance level. .

Display

This view is made of a table where the first column presents the list of items. There are three display modes are available based on the three object types:

a list of packages
a list of classes
a list of instances for each class

Statistics displayed for each object type

The data displayed depends what object type is selected. The statistics available for each object are summarized in the table below.

Column heading	Package statistics	Class statistics	Instance statistics
Total Instances The total number of instances that had been created of the selected package, class, or method.	Accumulated by package	Accumulated by class	Count
Live Instances The number of instances of the selected package, class, or method, where no garbage collection has taken place.	Accumulated by package	Accumulated by class	Count
Collected The number of instances of the selected package, class, or method, that were removed during garbage collection.	Accumulated by package	Accumulated by class	Count
Total Size The total size (in bytes) of the selected package, class, or method, of all instances that were created for it, including whatever has been removed through garbage collection.	Accumulated by package	Accumulated by class	Size
Active Size The summed size of all live instances.	Accumulated by package	Accumulated by class	Size

Note: The totals shown in this view represent only the data that has been collected since you started monitoring your process. If you start monitoring your process half way through the execution, you will only see the totals from the point that you started monitoring. As well, in the package mode, only the totals of the collected classes for that package are shown. Classes that you have filtered out will not be included in the totals.

Note: In order for instance level data to be shown for the active size and collected columns in the Memory Statistics view, instance level data must be collected for the Time Analysis profiling type. To collect instance level data, you must perform the following actions on the Profiling Types page for your profiling set.

In the left hand pane, select the check box for Memory Analysis.

For information on how to access the Profiling Types page for a profiling set, see the following tutorial: Analyzing the profiling data from a Java™ process.

Display symbols

The delta icons and indicate that there is a change in the numeric value (increase or decrease respectively) for that particular cell since the last time the table was refreshed.
The diamond and from the Profiling Monitor view was pressed.

Controls

Table 1. Toolbar controls
Icon	Definition
	Display the package statistics.
	Display the class statistics.
	Display the instance statistics.
	Open the source of a selected item.
	Shows the percentage of memory allocated.
	Shows the change in each numeric column since the last refresh.
	Filter objects based on time, size, total instances, or other criteria.
	Export the data to a file.
	Select the columns to be displayed, or select Sort by column.

Table 2. Pop-up menu controls
Icon	Definition
	Refresh the view.
	Choose the columns to display.
	Open the source of a selected item.

Filtering

The statistics views provide filtering based on name. Use the Filter field to specify a string pattern.

Column controls

Click the title of a column to sort it. Click the title of the column again to sort it in reverse order. The title of the column is prefixed with > if the column is sorted in ascending order or with < if it is sorted in descending order.

Columns can be hidden or shown.

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