The NAS can satisfy the requirement of more big capacity,more faster access speed and more easier accessfor the storage system. The conventional NAS usually lacks the cooperation mechanism and can not utilize the re-s...The NAS can satisfy the requirement of more big capacity,more faster access speed and more easier accessfor the storage system. The conventional NAS usually lacks the cooperation mechanism and can not utilize the re-source of other NAS to get high performance. This paper presents a high performance cooperation write cache mecha-nismfor NAS-ACAWM. ACAWM introducs the automatic cooperation mechanism and asynchronous write mecha-nism into NAS. Automatic combination methanism can make NAS to cooperate each other without artificial configura-tion and asynchronous write mechanism improves the performancc of the file write. The design of ACAWM fully con-siders over the usability of NAS and has no special requirement of the client. At last,this paper uses experiment toprove that ACAWM can greatly improve the performance of NAS.展开更多
介绍了提高Web服务器性能的前沿技术——分布式Web服务器系统,讨论了现有各种方案的优缺点,在此基础上提出一种新的分布式Web服务器系统.该系统使用基于标记的缓存协作用户请求分发方法(tag based cache cooperative Web requests distr...介绍了提高Web服务器性能的前沿技术——分布式Web服务器系统,讨论了现有各种方案的优缺点,在此基础上提出一种新的分布式Web服务器系统.该系统使用基于标记的缓存协作用户请求分发方法(tag based cache cooperative Web requests distribution,简称TB-CCRD),通过前端机把系统中各个Web服务器的缓存组织成一个大的虚拟缓存系统,提高系统的整体缓存命中率,缩短了请求的响应时间;通过分布式处理TCP连接转交来消除前端机的性能瓶颈;利用标记通告URL在缓存中的位置,避免了额外的系统内部通信.从而得到了一个可扩展的高性能分布式Web服务器系统.展开更多
为满足用户分散的大规模视频流媒体应用需求,该文提出了一种基于多控制器集群缓存代理结构(Multi-controller based Cluster Streaming Cache Proxy,MCSCP),该体系由一组控制器构成控制子系统,由多个内容存储器构成分布式存储子系统。...为满足用户分散的大规模视频流媒体应用需求,该文提出了一种基于多控制器集群缓存代理结构(Multi-controller based Cluster Streaming Cache Proxy,MCSCP),该体系由一组控制器构成控制子系统,由多个内容存储器构成分布式存储子系统。对控制子系统的关键问题进行了深入研究:采用图论思想给出控制器组的选取算法,设计了一种基于优先级的主控制器选举和在线切换协议(Priority based Master-controller Election and Handover,PMEH)。建立数学模型分析了多控制器体系对系统可靠性的改善程度,讨论了控制器选取算法的性能,研究了协议中报文发送间隔变量与系统开销的关系,并使用仿真实验给出了该参数的最佳取值范围。展开更多
Content-Centric Networking is a novel future network architecture that attracts increasing research interests in recent years. In-network caching has been regarded as a prominent feature of Content-Centric Networking ...Content-Centric Networking is a novel future network architecture that attracts increasing research interests in recent years. In-network caching has been regarded as a prominent feature of Content-Centric Networking since it is able to reduce the network traffic, alleviate the server bottleneck and decrease the user access latency. However, the CCN default caching scheme results in a high caching redundancy, causing an urgent need for an efficient caching scheme. To address this issue, we propose a novel implicit cooperative caching scheme to efficiently reduce the caching redundancy and improve the cache resources utilization. The simulation results show that our design achieves a higher hit ratio and a shorter cache hit distance in comparison with the other typical caching schemes.展开更多
文摘The NAS can satisfy the requirement of more big capacity,more faster access speed and more easier accessfor the storage system. The conventional NAS usually lacks the cooperation mechanism and can not utilize the re-source of other NAS to get high performance. This paper presents a high performance cooperation write cache mecha-nismfor NAS-ACAWM. ACAWM introducs the automatic cooperation mechanism and asynchronous write mecha-nism into NAS. Automatic combination methanism can make NAS to cooperate each other without artificial configura-tion and asynchronous write mechanism improves the performancc of the file write. The design of ACAWM fully con-siders over the usability of NAS and has no special requirement of the client. At last,this paper uses experiment toprove that ACAWM can greatly improve the performance of NAS.
基金Supporled by the National Natural Science Foundation of China under Grant Nos.60403031,90604015(国家自然科学基金)the National Basic Research Program ofChina under Grant No.2007CB310702(国家重点基础研究发展计划(973))
文摘介绍了提高Web服务器性能的前沿技术——分布式Web服务器系统,讨论了现有各种方案的优缺点,在此基础上提出一种新的分布式Web服务器系统.该系统使用基于标记的缓存协作用户请求分发方法(tag based cache cooperative Web requests distribution,简称TB-CCRD),通过前端机把系统中各个Web服务器的缓存组织成一个大的虚拟缓存系统,提高系统的整体缓存命中率,缩短了请求的响应时间;通过分布式处理TCP连接转交来消除前端机的性能瓶颈;利用标记通告URL在缓存中的位置,避免了额外的系统内部通信.从而得到了一个可扩展的高性能分布式Web服务器系统.
文摘为满足用户分散的大规模视频流媒体应用需求,该文提出了一种基于多控制器集群缓存代理结构(Multi-controller based Cluster Streaming Cache Proxy,MCSCP),该体系由一组控制器构成控制子系统,由多个内容存储器构成分布式存储子系统。对控制子系统的关键问题进行了深入研究:采用图论思想给出控制器组的选取算法,设计了一种基于优先级的主控制器选举和在线切换协议(Priority based Master-controller Election and Handover,PMEH)。建立数学模型分析了多控制器体系对系统可靠性的改善程度,讨论了控制器选取算法的性能,研究了协议中报文发送间隔变量与系统开销的关系,并使用仿真实验给出了该参数的最佳取值范围。
基金supported in part by the 973 Program under Grant No.2013CB329100in part by NSFC under Grant No.61422101,62171200,and 62132017+1 种基金in part by the Ph.D. Programs Foundation of MOE of China under Grant No.20130009110014in part by the Fundamental Research Funds for the Central Universities under Grant No.2016JBZ002
文摘Content-Centric Networking is a novel future network architecture that attracts increasing research interests in recent years. In-network caching has been regarded as a prominent feature of Content-Centric Networking since it is able to reduce the network traffic, alleviate the server bottleneck and decrease the user access latency. However, the CCN default caching scheme results in a high caching redundancy, causing an urgent need for an efficient caching scheme. To address this issue, we propose a novel implicit cooperative caching scheme to efficiently reduce the caching redundancy and improve the cache resources utilization. The simulation results show that our design achieves a higher hit ratio and a shorter cache hit distance in comparison with the other typical caching schemes.
