Window: Top-down Tree
Use the
Top-down Tree
window to explore the call sequence flow of the application and analyze the time spent in each program unit and on its callees.
To access this pane:
Run a performance analysis type collecting stacks and click the
Top-down Tree
tab when the collection result opens.

Function Stack | The
Function Stack column represents call sequences (stacks) detected during collection phase starting from the application root (usually, the
main() function). The time value for a row is equal to the sum of all the nested items from that row. Use this data to see the impact of program units together with their callees. This type of investigation is known as a
top-down analysis .
In this example above, the hotspot
thread_video function has three callees, where
rt_renderscene is the first candidate for optimization.
The call stacks are always available for the results of the user-mode sampling and tracing collection. They are also available for the results of the hardware event-based sampling collection, if you enabled the
Collect stacks option during the analysis configuration. Otherwise, the
Function Stack column for the event-based sampling results shows a flat list of the functions.
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< Performance metrics > | Each data column in the
Top-Down Tree grid corresponds to a
performance metric. The list of performance metrics varies with the analysis type and selected viewpoint. In the
Top-down Tree window, the
Intel® VTune™
provides two types of metrics:
Profiler
By default, all program units are sorted in a descending order by the metric values in the first column (for example,
CPU Time: Total ) providing the most performance-critical program units first. You may click a column header to re-sort the table by the required metric.
Mouse over a column header to see a metric description.
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