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介绍了一个称为TV-Anytime的新型宽带媒体服务,提出了一个基于层次型服务器网络之上的大规模TV-Anytime系统模型。着重地研究了其中一个关键问题--服务器网络的影像对象映射问题,并形式化地将其定义为一个组合优化问题。基于服务器网络的总存储容量、连接服务器结点之间的主干网通信带宽、用户的服务请求模式,来考虑尽大化服务器网络可提供的总服务质量。给出了基于模拟退火的启发式算法集,并基于一套映射问题的基准集实例对算法进行了模拟和性能分析。算法得到近似最优的方案。 相似文献
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开放分布式处理要求分布工系统提供高性能的广播通信手段,以支持网络环境下对象间的合作和数据传输。本文分析了TCP/IP协议族中传输层协议对上述目标支持的局限性,提出一个Check报文控制算法,实现了可靠的快速的广播通信机制,获得了较好的性能。对象 相似文献
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Parallel-supported environment plays a very important role in distributed/parallel system. We design and implement a parallel-supported environment JavaPVM on a network which consists of heterogenous platform and heterogenous OS system connected by ATM. And it is applied in CSCW and Java language auto-complier. 相似文献
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Autonomic Performance and Power Control on Virtualized Servers: Survey,Practices, and Trends 下载免费PDF全文
Modern datacenter servers hosting popular Internet services face significant and multi-facet challenges in performance and power control. The user-perceived performance is the result of a complex interaction of complex workloads in a very complex underlying system. Highly dynamic and bursty workloads of Internet services fluctuate over multiple time scales, which has a significant impact on processing and power demands of datacenter servers. High-density servers apply virtualization technology for capacity planning and system manageability. Such virtuMized computer systems are increasingly large and complex. This paper surveys representative approaches to autonomic performance and power control on virtualized servers, which control the quality of service provided by virtualized resources, improve the energy efficiency of the underlying system, and reduce the burden of complex system management from human operators. It then presents three designed self-adaptive resource management techniques based on machine learning and control for percentile-based response time assurance, non-intrusive energy-efficient performance isolation, and joint performance and power guarantee on virtualized servers. The techniques were implemented and evaluated in a testbed of virtualized servers hosting benchmark applications. Finally, two research trends are identified and discussed for sustainable cloud computing in green datacenters. 相似文献
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基于PVM的分布计算的研究 总被引:8,自引:1,他引:8
本文讨论了PVM的计算模型,分析了其支持客户机/服务器(Client/Server)分布计算的不足,设计和实现了一个可以提供较好透明性的,静态和动态调用接口的RPC机制,并获得较好的结果。 相似文献
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