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What does EDF stand for?

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What does EDF stand for?

(a) earliest deadline fix

(b) earliest due fix

(c) earliest due first

(d) earliest deadline first

I got this question during an online interview.

The above asked question is from Aperiodic Scheduling in section Embedded Operating System, Middleware and Scheduling of Embedded Systems

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Correct answer is (d) earliest deadline first

Easiest explanation: The EDF stands for earliest deadline first. This algorithm is optimal with respect to minimizing the maximum lateness and is implemented as dynamic scheduling algorithm for a set of n independent tasks with arbitrary arrival times, any algorithm that at any instant executes the task with the earliest absolute deadline among all the ready tasks is optimal with respect to minimizing the maximum lateness.

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