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The heap walker options dialog is displayed each time before the actual
heap snapshot is taken.
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Select recorded objects
If this option is checked, the heap walker will restrict the heap snapshot to
recorded objects only. In this way you can focus on the objects that have been created
during a selected time span. If the option is unchecked, all objects on the heap will
be shown (excluding any objects removed by the next option).
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Remove unreferenced and weakly referenced objects
If this option is checked, JProfiler will remove all objects from the
heap that are not strongly referenced. These include:
- unreferenced objects that are eligible for garbage collection
- objects that are referenced only through soft, weak and phantom references
-
objects that are in the finalizer queue and will be garbage collected
as soon as the finalizers have been run
For strongly referenced objects, the heap walker will not display soft,
weak and phantom references.
This mode is preferable for memory leak detection, and is especially helpful
to obtain useful information when showing the
path to root
for selected objects.
Unchecking this option allows you to analyze the heap "as-is".
<= 1.3 JVMs perform a full garbage collection before the heap snapshot is taken,
so unreferenced objects can never occur even if the option is unchecked. With
>= 1.4 JVMs, no garbage collection is performed prior to the snapshot.
Note: With Java >= 1.5.0 (JVMTI), unreferenced objects are not shown by the
heap walker. The dynamic memory views like the all objects view and the
can therefore show higher instance counts.
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Record primitive data (JVMPI only)
Note: This option is only visible when you profile with Java
<= 1.4.2 (JVMPI). With Java >= 1.5.0 (JVMTI), primitive data is never recorded,
but requested on demand.
If this option is checked, the heap walker will record primitive data and display
string values in the
reference graph as well as
strings and values of primitive fields in the
data view. Deselecting this option
will save memory and is advisable if you experience memory problems when taking heap snapshot.
If the option is unchecked, the data view
will display N/A for primitive values.
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