In order to prepare an allocation call tree, you have to click on the
calculate toolbar button
or choose View->Calculate Allocation Call Tree from JProfiler's
main menu. If an allocation tree has already been calculated, the context sensitive menu
also gives access to this action.
Before the allocation call tree is calculated, the allocation options dialog is shown. The class or package selection as well as the selected liveness mode are displayed at the top of the allocation call tree view.
If URL splitting is enabled in the servlet probe
each request URL creates a new node with a
special icon and the prefix
URL:, followed by the part of the request URL on which the allocation call tree
was split. Note that URL nodes group request by the displayed URL.
When you switch between two aggregation levels, JProfiler will make the best effort to preserve your current selection. When switching to a a more detailed aggregation level, there may not be a unique mapping and the first hit in the allocation call tree is chosen.
The allocation call tree doesn't display all method calls in the JVM, it only displays
Runnable.run()
and the main method are always displayed, regardless of
the filter settings.
A particular node is a bridge node if it would normally not be displayed in the view, but has descendant nodes that have to be displayed. The icons of bridge nodes are grayed out. For the allocation call tree view this is the case if the current node has no allocations, but there are descendant nodes that have allocations.
To quickly expand larger portions
of the allocation call tree, select a method and choose
View->Expand Multiple Levels from the main window's menu or
choose the corresponding menu item from the context menu. A dialog is shown
where you can adjust the number of levels (20 by default) and the threshold in per mille
of the parent node's value that determines which child nodes are expanded.
If you want to
collapse an opened part of the allocation call tree, select the
topmost method that should remain visible and choose
View->Collapse All from the main window's menu or
the context menu.
DEL
key
or by choosing Hide Selected from the context menu. Percentages will be corrected accordingly as if the
hidden node did not exist.
All similar nodes in other call stacks will be hidden as well.
When you hide a node, the toolbar and the context menu will get a Show Hidden
action. Invoking this action will bring up a dialog where you can select hidden elements to be shown again.
If a node is excluded, you will get options to add an inclusive filter, otherwise you will get options to add an exclusive filter. These actions are not available for classes in the "java." packages.
Note that the line number shows the line number of the invocation and not of the method itself.
The size and the allocation count are either cumulated for all calls below the associated node or not, depending on the corresponding cumulation view setting. Note that allocations performed in calls to filtered classes are consolidated in the first call into a filtered class.