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

NOTE: If accessed from the View menu of the main window, this view will plot all calls on any object. You can bring up the view for a single object by right-clicking on a service call in the trace view and selecting Blocking Time Graph from the [Object Name] submenu.

View Options

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

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.
Configure Y-Axis... Opens the Configure Y-Axis dialog, through which you can choose an automatic (default) or manual setup.
Show in Trace View

Show this data in the current Trace View or create a new Trace View to show the data.
Export to File Opens the Export Graph dialog, through which you can export the graph data to a CSV file.
Show Bookmarks

Toggles display of bookmarks
Show Legend

Toggles display of the color legend.
Show ScrollBar

Toggles display of the scroll bar.
Settings Opens the View Settings dialog, through which you can set current and default settings for this view.

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