Kernel Call Block Time

The Kernel Call Block Time graph displays the kernel blocking times of the RTX64 calls that can block: RtWaitForSingleObjectEx and RtWaitForMultipleObjectsEx. Each data point represents a specific kernel service call, where the x-position indicates the point in time and the y-position the blocking time. Clicking a data point (a service call) will highlight it in the trace view. One use of this graph is to identify unintentional blocking, which can cause unusually high response times of threads.

NOTE: If accessed from the View menu of the main window, this view will plot all calls on any kernel object. To display this view for a single object, right-click on a kernel service call in the trace view and select Blocking Time Graph from the [Object Name] submenu.

Menu Options

Views Menu	Option	Description
	Add	Add a view to the current view.
	Remove	Remove an existing view from the current view.
	Resize Views To Fit	Resizes all views to fit the current view window.
Resolution Menu	Option	Description
	Very High - 200 High - 100 Medium - 50 Low - 25 Very Low - 10 Single - 1	Determines the number of intervals (data points in a line graph or bars in a bar graph) to display. For a more detailed graph, increase the number of intervals by selecting a higher resolution.
Zoom Menu	Option	Description
	Show Full Trace	Displays the full trace in the current view.
	Zoom In	Zooms in on the current view. To focus on a specific area, click and drag to select an interval.
	Zoom Out	Zooms out of the current view. To focus on a specific area, click and drag to select an interval.
Customize Menu	Option	Description
	Show Filters/Legends	Toggles view of the actor view filters and legend.
	Show Tool Panel	Toggles display of the Tool Panel.
Display Options	Description
	Various options for customizing the display of the current view. Each view contains its own Display Options icon (shown at left are the display options for the CPU Load Graph view) . Note that the options available from this menu will vary depending on the graph/view.

Time Region

A gray rectangular outline indicates the time region that is currently displayed by the Trace View. As the Trace View zooms in and out, this rectangle updates dynamically to mark the current region.

NOTE: You can combine this view with other horizontal views by choosing Views > Add > (graph type).

Related Topics about the Tracealyzer User Interface: