Examine information about a thread's state
In addition to asking why a particular process's thread may be running, developers are often faced with the task of understanding what the rest of the system is doing at a particular point in time. This question can easily be answered using the Thread State Snapshot view ().
Like the Why Running? view, this view is keyed off of the current cursor position in the System Profiler editor Timeline pane. For a given time/position, it determines the state of all of the threads in the system and present that list to you in such a fashion that you can then determine if this "system state" is what you'd anticipated.
The System Profiler's Thread State Snapshot view.
Note that you must click the refresh icon in the Thread State View's toolbar to update the contents of the Thread State View when you select a point in the Timeline.