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This paper deals with the study of Earliest Deadline First (EDF) which is anoptimal scheduling algorithm for uniprocessor real time systems use forscheduling the periodic task in soft real-time multiprocessor systems. In hardreal-time systems, a significant disparity exists EDF-based schemes and RMAscheduling (which is the only known way of optimally scheduling recurrentreal-time tasks on multiprocessors): on M processors, all known EDF variantshave utilization-based schedulability bounds of approximately M/2, while RMAalgorithms can fully utilize all processors. This is unfortunate because EDFbased algorithms entail lower scheduling and task migration overheads. In workon hard real-time systems, it has been shown that this disparity inSchedulability can be lessened by placing caps on per task utilizations. Ourmain contribution is a new EDF based scheme that ensures bounded deadlinetardiness. In this scheme, per-task utilizations must be focused,but overallutilization need not be stricted. Our scheme should enable a wide range of softreal-time applications to be scheduled with no constraints on totalutilization. Also propose techniques and heuristics that can be used to reducetardiness as well as increase the efficiency of task.

Schedulability Test for Soft Real-Time Systems under Multiprocessor Environment by using an Earliest Deadline First Scheduling Algorithm