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Progress Report. 2013/08/08. Example. Deadline of interactive task 2. Deadline of interactive task 1. Deadline of interactive task 3. Interactive Task 1. Interactive Task 2. Interactive Task 3. Computation Task 3. i =1. i =2. Core0. H. Interactive Task 3. Computation Task 4. Core1.
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Progress Report 2013/08/08
Example Deadline of interactive task 2 Deadline of interactive task 1 Deadline of interactive task 3 Interactive Task 1 Interactive Task 2 Interactive Task 3 Computation Task 3 i=1 i=2 Core0 H Interactive Task 3 Computation Task 4 Core1 H Computation Task 1 Computation & Background Tasks Back ground Task 2 Core2 L Computation Task 2 Background Task 1 Core3 L
Model Modification • Each core works under the same frequency due to hardware limitation. • A task can have different processing rates during its execution.
Observation 1 • If there is only one task, the processing rate should remain unchanged. • => w = 0 or 1 w 1-w
Observation 2 • Frequency changing only happens when a new task arrived or a task has finished. B1 B1 B1 B2-B1 B2-B1 B1
Length of Overlapping • Assume that tasks have different arrival time. • Increase the processing rate of Task0 during t0 to t1 reduces the overlapping of Task0 and Task1. Task0 Task1 Task0 Task1 t0 t1 t2’ t2