【摘要】 针对网格环境下数据高度动态性的特点,提出了一种基于价值模型的数据副本替换算法,给出了副本价值计算方法,并把它应用到数据副本替换中.即在进行数据复制过程中,存储空间不够时,删掉价值最低的副本.算法实现了数据分布和复制的优化,有效提高了数据网格环境下网格任务访问数据的最大吞吐量.实验表明,采用基于价值模型的副本替换算法,有效地提高了网格任务访问数据副本的效率.更多还原

【Abstract】 Adapting to the high variation environment in data grid,a data replica replacement algorithm based on value model is proposed and the arithmetic to calculate replica value is introduced.The algorithm is used on data replica replacement.When there is not enough storage space during replication,the replica whose value is the least will be deleted.This algorithm can improve and maintain a high overall throughput of grid jobs that access files in a data grid.Experimental results show that the proposed algorithm can obtain better performance for grid task to access data replica.更多还原