摘要： 基于QoS参数的资源调度在执行中由于参数不满足要求导致调度失败，可靠性不强，而部分QoS参数具有累加属性，可实现不同任务之间的参数容错。基于此，在考虑用户偏好的基础上，分析参数特性，提出一个在时间和成本上实现多任务之间容错的调度算法。该算法在不增加预算的基础上可以提高任务执行的成功率，并能够根据用户的偏好更好地满足用户的需求。实验结果表明，在QoS参数上的调度容错能够较大地提高调度的可靠性。

关键词: QoS模型, 时间, 成本, 参数容错

Abstract: Most of fails in schedule algorithm based on QoS parameters is due to the QoS parameters miss, so the system is not very robust. According to some QoS parameters’ accumulative property, it can achieve fault-tolerance between tasks. Based on the user preference, this paper analyzes the QoS parameters and a parameters fault-tolerance schedule algorithm as to time and cost is proposed. The algorithm can improve success rates of implementing task on the base of not increasing cost, and meets the user preference. Experimental results show that the fault-tolerance on QoS parameters can improve the reliability of schedule.

Key words: QoS model, time, cost, parameters fault-tolerance

中图分类号: 

• TP302.8