User Guide


Window: Event Count - Hardware Events

Use the
Event Count
window to analyze the event count for PMU (Performance Monitoring Unit) events.
Depending on the analysis type or viewpoint, the
Event Count
window may include the following panes:

Event Count Pane

The Event Count pane attributes the Hardware Event Count by Hardware Event Type to program units. The
Hardware Event Count
metric estimates the number of times an event occurred during the collection.
By default, the data in the grid is sorted by the Clockticks event.
The list of hardware events depends on the analysis type. You may right-click an event column and select the
What's This Column
context menu option to open the description of the selected event.
When you explore the hardware events statistics for a result, you may drag and drop the columns in the grid for your convenience.
automatically saves your preferences and keeps the columns order for subsequent result views.

Timeline Pane

pane is synchronized with the
Event Count
pane. The
area of the
pane shows the number of times the selected event (CPU_CLK_UNHALTED.REF_TSC in the example below) occurred while a thread was running. You may use the
Hardware Event Count
drop-down menu in the legend area to choose a different event.
Hardware Event Type
area shows the application-level performance per each event.

Call Stack Pane

If you selected the Collect stacks option for the hardware event-based sampling analysis (for example, Hotspots), the
provides the Call Stack pane. Use this pane to navigate between stacks and analyze the distribution of the event count for the object selected in the
Event Count
pane. For the example below, you select the Clockticks event to see stacks leading to the
function and contributing to the Clockticks event count. You can use this data to identify the most performance-critical stacks with the highest contribution to the object's Clockticks event count.

Product and Performance Information


Performance varies by use, configuration and other factors. Learn more at