نبذة مختصرة : In recent years, the fast evolution in the industry of computer hardware such as the processors, has led the application developers to design advanced software's that require massive computational power. Thus, grid computing has emerged in order to handle the computational power demands requested by the applications. Quality of service (QoS) in grid is highly required in order to provide a high service level to the users of Grid. Several interactions events are involved in determining the QoS level in grid such as; allocating the resources for the jobs, monitoring the performance of the selected resources and the computing capability of the available resources. To allocate the suitable resources for the incoming jobs, a scheduling algorithm has to manage this process. In this paper, we provide a critical review the recent mechanisms in “grid computing” environment. In addition, we propose a new scheduling algorithm to minimize the delay for the end user, Gap Filling policy will be applied to improve the performance of the priority algorithm. Then, an optimization algorithm will perform in order to further enhance the initial result for that obtained from backfilling mechanism. The main aim of the proposed scheduling mechanism is to improve the QoS for the end user in a real grid computing environment.
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