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These two types of timing behavior for task switching can be seen in Figure 4.
Figure 4: Task Switching Timing
In this figure, we see that for a general-computing (non-real-time) operating system, the task switching time generally rises as a software system includes more tasks that can be scheduled. However, the actual time for a task switch is not the time shown by the dashed red line. Instead, in any given task switch instance, it might be well above or well below the time shown by the dashed red line. The shaded regions surrounding the dashed red line simply show the likelihood of the actual task switch time being that far above or below the dashed red line.