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Advantages of Priority Scheduling-
1.Simplicity.
2.Reasonable support for priority.
3.Suitable for applications with varying time and resource requirements.
Disadvantages of Priority Scheduling-
1.Indefinite blocking or starvation.
2.A priority scheduling can leave some low priority waiting processes indefinitely for CPU.
3.If the system eventually crashes then all unfinished low priority processes gets lost.
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The main advantage is that they ensure fairness to all jobs, regardless of its priority and also provide quick response time depending on the CPU time the job needs. The main disadvantage is that it provides indefinite postponement to process.
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A disadvantage of non preemptive scheduling is that it could introduce blocking delays in tasks that are high priority. With this type of scheduling you can also not meet deadlines because decisions can only be made after the task is completed.
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