Service Call Block Time

The Service Call Block Time graphs (Views > Service Blocking > ...) display the service 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.

This information is available for all objects (Views > Service Blocking > Service Call Block - All Objects) or a selected object (Views > Service Blocking > Service Call Block - Select Object).

The Service Call Block - All Objects view

View Options

The View menu contains several options that allow you to change the graph’s display and content.

Menu	Option	Description
	Clone View	Creates a duplicate copy of the view in the same window.
	Draw Markers	Toggles display of markers.
	Markers in Actor Color	Sets all markers to the actor color if Draw Markers is selected.
	Line Style	Choose a line style for the graph to display: No Lines Steps Straight
	Show Unit on Scale	Toggles display of the units of measurement.
	Setup Scale	Opens the Setup Scale dialog, through which you can choose an automatic (default) or manual scale.
	Show Bookmarks	Toggles display of bookmarks
	Show Legend	Toggles display of the color legend.
	Show ScrollBar	Toggles display of the scrollbar.