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This problem compares fixed vs. dynamic priorities, and is based on an example by Burns and Baruah (2008). Consider two periodic tasks, where task T1
This problem compares fixed vs. dynamic priorities, and is based on an example by Burns and Baruah (2008). Consider two periodic tasks, where task T1 has period p1 = 2, and task T2 has period p2-3. Assume that the execution times are e1 1 and 2 = 1.5. Suppose that the release time of execution of task T1 1s given by ri ,i = 0.5 + 2(i-1) for i = 1,2, -.. Suppose that the deadline of execution i of task T1 is given by . 1,1 2i. Correspondingly, assume that the release times and deadlines for task T2 are T2,i = 3(i-1) and (a) Give a feasible fixed-priority schedule. (b) Show that if the release times of all executions of task T are reduced by 0.5, then no fixed-priority schedule is feasible. (c) Give a feasible dynamic-priority schedule with the release times of task T1 reduced to ri ,i = 2(i-1) This problem compares fixed vs. dynamic priorities, and is based on an example by Burns and Baruah (2008). Consider two periodic tasks, where task T1 has period p1 = 2, and task T2 has period p2-3. Assume that the execution times are e1 1 and 2 = 1.5. Suppose that the release time of execution of task T1 1s given by ri ,i = 0.5 + 2(i-1) for i = 1,2, -.. Suppose that the deadline of execution i of task T1 is given by . 1,1 2i. Correspondingly, assume that the release times and deadlines for task T2 are T2,i = 3(i-1) and (a) Give a feasible fixed-priority schedule. (b) Show that if the release times of all executions of task T are reduced by 0.5, then no fixed-priority schedule is feasible. (c) Give a feasible dynamic-priority schedule with the release times of task T1 reduced to ri ,i = 2(i-1)
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