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In this paper I have study to Reduce the time Complexity of Earliest DeadlineFirst (EDF), a global scheduling scheme for Earliest Deadline First in RealTime System tasks on a Multiprocessors system. Several admission controlalgorithms for Earliest Deadline First (EDF) are presented, both for hard andsoft real-time tasks. The average performance of these admission controlalgorithms is compared with the performance of known partitioning schemes. Ihave applied some modification to the global Earliest Deadline First (EDF)algorithms to decrease the number of task migration and also to addpredictability to its behavior. The Aim of this work is to provide asensitivity analysis for task deadline context of multiprocessor system byusing a new approach of EFDF (Earliest Feasible Deadline First) algorithm. Inorder to decrease the number of migrations we prevent a job from moving oneprocessor to another processor if it is among the m higher priority jobs.Therefore, a job will continue its execution on the same processor if possible(processor affinity). The result of these comparisons outlines some situationswhere one scheme is preferable over the other. Partitioning schemes are bettersuited for hard real-time systems, while a global scheme is preferable for softreal-time systems.

An Algorithm to Reduce the Time Complexity of Earliest Deadline First Scheduling Algorithm in Real-Time System