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Which algorithm can be used to schedule tasks at run-time?

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Which algorithm can be used to schedule tasks at run-time?

(a) online scheduler

(b) offline scheduler

(c) multiprocessor scheduler

(d) uniprocessor scheduler

I got this question by my school principal while I was bunking the class.

My question comes from Classification of Scheduling Algorithms topic in chapter Embedded Operating System, Middleware and Scheduling of Embedded Systems

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The correct answer is (a) online scheduler

Explanation: The online scheduling algorithm schedule tasks at run-time which is based on the information regarding the task whereas offline algorithms schedule tasks take a priori knowledge about the execution times, arrival times and deadlines into account.

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