摘要
根据查询负载轻重,讨论了并行XML数据库中查询间并行性的处理机分配问题,并提出四种处理机分配策略,即平均分配法、比例分配法、组合分配法以及串行分配法·通过性能仿真分析得出,在大多数情况下,组合分配法性能最好·但当处理机数np接近最大可用处理机数nmax p时,比例分配法性能最好·当np小于nmax p的40%时,平均分配法性能最差;反之,当np大于nmax p的40%时,串行分配法性能最差·
Depending on query workloads, the issues about processor allocation based on interquery parallelism in parallel XML database system were discussed. Four processor allocation strategies, i.e., average allocation method, proportional allocation method, combinational allocation method and serial allocation method are proposed respectively. By experimental simulation, it is found that, in most cases, the performance under the combinational allocation method is the best. But, when the number of processors np is close to its maximum value nmaxp, the performance under the proportional allocation method becomes the best. Nevertheless, if np is less than the 40 percent of nmaxp, the performance under the average allocation method is the worst. On the contrary, when np is greater than the 40% of nmaxp, the seriary allocation method is the worst.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2003年第8期758-761,共4页
Journal of Northeastern University(Natural Science)
基金
教育部高校优秀青年教师教学科研奖励计划基金资助项目
教育部高校骨干教师基金资助项目
