Release Jitter and Timer Granuality

Normally, perodic tasks within the system do not suffer release jitter, however the system may have some granularity on the timer in which case there is some release jitter e.g. if a task is released every 15 ms but the implementation restricts granularity of the system timer to 10 ms, the periodic task will run at 0, 20, 30, 50 etc.

If we want to get response time Ri which is measured relative to the real release time then we need to add the value of the jitter to the calculated value:

Ri = Ri + Ji

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