Pane: Call Stack

Stack metric drop-down menu. Select a performance metric to explore the distribution of this metric over stacks of the selected object.

Navigation bar. Click the next/previous arrows to view stacks for the selected program unit(s). The stack types are classified by metrics and depend on the selected viewpoint. For example, for the Locks and Waits viewpoint the following stack types are available:

If you select the Wait Time metric as a stack type, you see call stacks where the object selected in the grid contributed to the application Wait time. When multiple stacks lead to the selected program unit, the Call Stack pane shows the stack that contributed most to the metric value, the hottest path, as the first stack. To see other stacks, click the navigation arrows. Note If several stacks go to the same functions in different code lines, the bottom-up tree shown in the Bottom-up pane aggregates these stacks in one line. But the Call Stack pane shows each as a separate stack. For more details, see the Pane: Bottom-up topic. If a selected stack type is not applicable to a selected program unit, the VTune Amplifier automatically uses the first applicable stack type from the stack type list instead.

Contribution bar. Analyze the indicator of the contribution of the currently visible stack to the overall metric data for the selected program unit(s). If you select a single stack in the result window, the Contribution bar shows 100%. If more than one program unit is selected, all the related stacks are added to the calculation.

In the example above, the function selected in the Bottom-up window had 3 CPU Time stacks leading to it with the total Wait time of 2.108 seconds. The first stack is responsible for 85.4% (or 1.800s) of the overall 2.108 seconds. Note that the Bottom-up grid aggregates all 3 stacks into one since all of them go to the same function in different code lines.

Call stack for a program unit selected in the grid or in the Timeline pane. Analyze the call sequence for the selected function according to the stack metric selected in the navigation bar. Each row in the stack represents a function (with an RVA and a line number of the call site, if available) that called the function in the row above it. When the Call Stack Mode on the filter toolbar is set to Only user functions, the system functions are shown at the bottom of the stack. When set to User/system functions, the system functions are shown in the correct location, according to the call sequence.

Click a hyperlink or double-click a function in the stack to open the source exactly where this function was called.

Context menu. Manage the call stack representation in the Call Stack pane (applicable to all stacks). Right-click and select an option. For example, you may de-select the Show in One-Line Mode option to view functions in two lines: