HP WDB GUI 5.7 Reference Manual (September 2007)

Debugging with WDB GUI
Debugging Memory Problems
Chapter 378
The following information is displayed in the View Heap Arena window:
Arenas
The Arena IDs are listed in the Arenas list menu. Select the required Arena ID from the
Arenas list menu to view Arena ID Summary, or Block Details for the selected arena.
Arena ID Summary
The summary information for the selected Arena ID is displayed in the Arena ID Summary
frame.
Block Details
To view the block level details in an arena, select Block Details after selecting the required
Arena ID in the Arenas list menu. The block distribution in the arena is displayed in the
Arenas Block Distribution window.
The Arenas Block Distribution window displays the block level space distribution graph for an
arena. The graph displays the space occupied by the user blocks, the free blocks, the
unclaimed space, and the malloc() metadata (which includes the node blocks, the cached
blocks, the holding header blocks, and the holding SBA blocks). The virtual address of the
blocks is used to arrange the blocks in the graph. The Block ID of the block is also displayed
within the block if the scale of the graph supports the display. The start of the heap, the end of
the heap, the total heap size, and the total number of blocks are also listed.
HP WDB GUI displays the block distribution graph in the default window. If the complete
block distribution graph cannot be displayed in the default window, you must select the
Expand Block Distribution Graph toggle option to view the magnified block distribution
graph.
To view the Block ID, the block type, the block size, and the virtual address for each block in
the arena, you must click on the required block in the block distribution graph.
The number of used blocks in each block-count range is also displayed graphically for the
selected arena. This information is also displayed in a tabular format.
Heap Arena Space Usage
The Heap Arena Space Usage frame displays the Arena ID, the space usage (in KB) in the
arena, and the percentage space usage in each arena in comparison to the total space occupied
by all the arenas. The comparative space usage across arenas is also displayed in a pie chart.
The Arena ID is also displayed in the pie chart if the scale of the graph supports it.
Full Summary
o view the summary for all the arenas, click Full Summary. The summary information for all
the arenas is displayed in the Arena Summary window.
Heap Arena Detailed Graphs