关键词: 网格, 资源预留, 任务可分, 服务质量

Abstract: Resource reservation is an important way for supporting quality of service in grid computing.However，advance reservations can lead to a reduced performance of grid applications，because resource fragments are resulted in while reserving.A new reservation mechanism is proposed in this paper，which is called as Task Dividable based Reservation（TDR）.In presented mechanism，resource reservations are very flexible and can transform in all directions，and within limitation of request，a reservation may be divided into small reservations that are defined as sub-reservations，so as to the performance of the network may be increased.The corresponding algorithm of admission control for TDR is presented.Performance studies based on simulations are carried out also，and the results show that the proposed mechanism outperforms existed similar mechanisms in the important performance metrics：call acceptance rate and bandwidth usage.

Key words: grid, resource reservation, task dividable, QoS