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本文详细论述了TigerSHARC Ts201中cache的结构和运行原理,并给出了在DSP复位后对cache进行初始化和打开cache使其处于工作状态的汇编程序,最后通过常用的FFT程序使用cache前后DSP所消耗的时间显示了cache在提高DSP性能方面起到的重要作用。 相似文献
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针对传统基于数据包传输的网络通信的不足,提出了主动网络的思想。详细阐述了主动网络的实施及基于移动agent的主动网络框架,并且在IBM开发的aglets平台上采用master—slave模式设计一个基于移动agent的聊天系统来验证主动网络框架实施的有效性,从而证实把移动agent用到主动网络里是一种行之有效的方法。 相似文献
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Cache Profiling技术 总被引:1,自引:0,他引:1
如何减少和隐藏cache失效的延迟,是人们关注的热点。编译器为了得到cache访问命中的情况,往往使用模拟器去跑一遍来得到结果,这样的速度很慢。为了克服以上缺点,提出了在编译器中作cache profiling来获取cache访问的信息。类似于value profiling和stride profiling,cache profiling对访存指令作插装,可以有效地提高速度,并且只需要编译器的支持即可。Cache profiling获得的信息可以用来改进指令调度、软件预取、生成cache hint和辅助线程等。 相似文献
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移动节点组成移动自组网(MANETs),MANETs没有固定的网络基础设施,也不存在中心信任机构,密钥管理是移动自组网安全最核心、最困难和最薄弱的环节,为了降低PKG密钥管理方案的通信开销,论文将ElGamal方案与预分配密钥管理方案相结合,提出了一种基于身份的预分配非对称密钥管理方案,在一定程度上降低了移动ad hoc网络非对称密钥管理中的通信开销[1~2],提高了网络安全. 相似文献
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移动数据库系统中移动Agent的嵌入 总被引:5,自引:0,他引:5
本文的研究重点旨在探讨移动agent技术在移动数据库系统中的应用,具体地说,在研究基于移动agnet的移动数据库模型的基础上,进一步探讨移动agent技术在移动查询处理和移动事务处理中具体实现的可能性和优越性,同时,研究由此产生的移动agent之间并发控制及移动数据管理,移动数据访问的问题。 相似文献
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基于移动Agent的IP网络管理系统设计 总被引:1,自引:0,他引:1
采用简单网管协议SNMP和管理信息库MIB的集中式网管技术在解决基于IP互连的动态变化的Internet网络管理上面临许多困难。文章提出了移动代理系统原型和网管框架,网络管理器根据用户要求和实际网络状态选择适当功能的网管移动agent发送到网络中,完成预期网管功能;移动agent不仅收集而且能够处理数据,从而增强了网管智能性,加快响应速度。 相似文献
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在移动计算环境中基于移动代理的缓存失效方案 总被引:2,自引:2,他引:2
1 引言缓存技术是分布式计算环境中的重要技术,它可以改善系统的整体性能(如查询响应时间、吞吐量等),而移动计算的网络环境是一种特殊的分布式环境,与传统的分布式系统相比,它具有鲜明的特点:移动性、断接性、带宽多样性、可伸缩性、弱可靠性、网络通信的非对称性、电源能力局限性等等。这些特点使得缓存技术在移动计算环境中尤为重要。因为缓存能有效减少带宽需求,并能节省移动计算机的能耗。 相似文献
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无线移动环境中缓存的主要目的是减少对无线带宽资源的占用和节省电池能量,然而移动无线终端的漫游与经常断开连接又给缓存内容的一致性带来了一系列新的问题。本文针对目前运行的GPRS网络,提出了在用户端(移动终端)和GPRS骨干网中添加验证服务器VS(Validation Server)对数据进行两级缓存的系统框架和缓存强一致性策略。该框架简化了无线移动环境下维护缓存一致性的复杂性,有效地降低了对无线带宽的占用和数据库服务器的负载,支持移动终端断开连接的时间任意和在一个公众陆地移动通信网PLMN网内的漫游,具有很强的实用性。 相似文献
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提出了一种改进的移动IP分布式路由方案,通过对转向代理处缓存的组织结构及重传机制的改变,减少了乱序包和重传包,从而降低了远程信令流量,使移动IP网络的性能得到改善。 相似文献
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一种基于移动环境的语义缓存一致性维护技术 总被引:1,自引:0,他引:1
在深入研究缓存失效广播技术和语义缓存的基础上,提出了一种新的基于移动环境的语义缓存一致性维护技术——基于语义缓存的异步有状态(BSCAS)技术。BSCAS技术可以支持移动客户的各种断接方式,减少无线通信的开销,让移动客户有更好的自治性。 相似文献
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A cache invalidation scheme for continuous partial match queries in mobile computing environments 总被引:1,自引:0,他引:1
Yon Dohn Chung 《Distributed and Parallel Databases》2008,23(3):207-234
The continuous partial match query is a partial match query whose result remains consistently in the client’s memory. Conventional
cache invalidation methods for mobile clients are record ID-based. However, since the partial match query uses content-based
retrieval, the conventional ID-based approaches cannot efficiently manage the cache consistency of mobile clients. In this
paper, we propose a predicate-based cache invalidation scheme for continuous partial match queries in mobile computing environments.
We represent the cache state of a mobile client as a predicate, and also construct a cache invalidation report (CIR), which
the server broadcasts to clients for cache management, with predicates. In order to reduce the amount of information that
is needed for cache management, we propose a set of methods for CIR construction (in the server) and identification of invalidated
data (in the client). Through experiments, we show that the predicate-based approach is very effective for the cache management
of mobile clients. 相似文献
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In this paper, we investigate a proxy-based integrated cache consistency and mobility management scheme for supporting client–server applications in Mobile IP systems with the objective to minimize the overall network traffic generated. Our cache consistency management scheme is based on a stateful strategy by which cache invalidation messages are asynchronously sent by the server to a mobile host (MH) whenever data objects cached at the MH have been updated. We use a per-user proxy to buffer invalidation messages to allow the MH to disconnect arbitrarily and to reduce the number of uplink requests when the MH is reconnected. Moreover, the user proxy takes the responsibility of mobility management to further reduce the network traffic. We investigate a design by which the MH’s proxy serves as a gateway foreign agent (GFA) as in the MIP Regional Registration protocol to keep track of the address of the MH in a region, with the proxy migrating with the MH when the MH crosses a regional area. We identify the optimal regional area size under which the overall network traffic cost, due to cache consistency management, mobility management, and query requests/replies, is minimized. The integrated cache consistency and mobility management scheme is demonstrated to outperform MIPv6, no-proxy and/or no-cache schemes, as well as a decoupled scheme that optimally but separately manages mobility and service activities in Mobile IPv6 environments. 相似文献
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Offloading cellular traffic through mobile social networks has arisen as a promising way for relieving cellular networks. Prior studies mainly focused on caching data in a number of pre-selected helpers. However, such a strategy would fail when mobile users enter and leave the target area over time. In this paper, we examine the research decisions and design tradeoffs that arise when offloading cellular traffic in such a dynamic area of interest, referred to as a MobiArea, and we design an offloading framework, MobiCache, for maximizing cellular operators’ revenues and minimizing the overhead imposed on mobile devices. On the user side, we propose a content floating-based cooperative caching strategy that caches data in geographical floating circles, instead of selected helpers in previous studies, to cope with the dynamics. A geographical routing scheme is designed for delivering data and queries towards floating circles. We also develop a cache replacement scheme to improve caching cost-effectiveness inside floating circles. On the operator side, query history and feedback are maintained for cellular operators to optimize framework parameters that maximize their revenues. Extensive trace-driven simulations show that, compared with a state-of-the-art scheme, MobiCache offloads up to 52% more traffic with 15% shorter delay and 6% less forwarding cost. 相似文献
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随着WWW的流行,Internet的需求变得非常大,扩展Internet的关键策略是对客户端进行缓冲以降低访问延迟和减少网络及服务器的负载,文章示意了用IBMAglet实现Web缓冲的方法,并讨论了基于移动Agent远程控制技术的内部结构及使用Socket在C 中实现来描述Aglet通信机制的实现过程。 相似文献
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In this paper, we propose an economics-based distributed negotiation scheme among mobile devices in mobile grid. In our model, there are energy negotiation and transactions between buyer devices and seller devices. Dynamic allocation of energy resources in mobile grid is performed through online transactions within markets. Mobile devices can be sellers and buyers that use optimization algorithms to maximize predefined utility functions during their transactions. Seller device agents sell the underlying energy resources of the mobile device. Buyer device agent makes buying decisions within the budget constraints to acquire energy resources. An economics-based negotiation algorithm among mobile devices is proposed. The proposed algorithm decomposes mobile grid system optimization problem into a sequence of two sub-problems. In the simulation, the performance evaluation of economics-based negotiation algorithm is evaluated. 相似文献