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1 引言随着网络技术的飞速发展和日益完善,分布式并行程序设计已经成为软件开发的主流技术之一。在分布式并行计算环境中,异构分布式环境中资源的透明存取和系统中各个异构节点间的通信问题是一个主要问题。OMG提出的CORBA规范,能很好地解决异构系统中面向对象的应用之间的通信问题,因此CORBA适合作为分布式并行应用程序的中间件。 CORBA的基本通信模型是同步通信,而在分布式并 相似文献
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1 引言近年来,随着分布式多媒体组应用的兴起,多媒体组通信机制开始得到人们的关注。组通信一直是一个比较重要的研究领域。对于传统的分布式组应用,已经取得了很多成果。但是,由于分布式多媒体组应用通常具有较高的QoS需求,因此传统分布式组应用领域的很多成果不能直接应用。为此,本文作者提出一种基于服务质量的多媒体组通信机制—QoS受控型组 相似文献
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分布式网络入侵检测系统中的通信设计 总被引:1,自引:0,他引:1
为了更好的发现网络入侵,对分布式入侵检测系统的通信机制进行了深入探讨和分析,提出了分布式入侵检测系统控制中心与代理之间以及代理与代理之间的通信的内容、格式,并对分布式入侵检测系统的通信安全性进行了讨论和设计。较好地解决入侵检测系统各部分的通信联系问题,更快地发现入侵。 相似文献
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工业环境分布式控制系统性能分析 总被引:1,自引:0,他引:1
本文简述了工业分布式控制系统的结构形式和分布式通信控制的软硬件结构,并对用通信控制器构成的工业分布式控制系统分析建立了其广义随机Petri网,并在此基础上应用连续时间马尔可夫链方法对其性能指标进行了分析,本文对常规局域网系统和工业分布式控制系统在通信特征和性能指标方面的区别也进行了讨论,该方法理论完备,严谨实用。 相似文献
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MDS是我们研制的一个多微机分布式系统,MDS/DOS是为其配置的一个分布式操作系统,它是在MS DOS的基础上通过增加分布式通信及资源管理模块DCRM,分布式命令解释器DCI,并建立相应的通信机制后修改、扩充而成。本文主要介绍MDS/DOS中分布式命令解释器DCI的设计与实现。 相似文献
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初阔林 《计算机技术与发展》2003,13(8)
为了更好的发现网络入侵,对分布式入侵检测系统的通信机制进行了深入探讨和分析,提出了分布式入侵检测系统控制中心与代理之间以及代理与代理之间的通信的内容、格式,并对分布式入侵检测系统的通信安全性进行了讨论和设计.较好地解决入侵检测系统各部分的通信联系问题,更快地发现入侵. 相似文献
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It is well known that an FDDI token ring network provides a guaranteed throughput for synchronous messages and a bounded medium access delay for each node/station. However, this fact alone cannot effectively support many real-time applications that require the timely delivery of each critical message. The reason for this is that the FDDI guarantees a medium access delay bound to nodes, but not to messages themselves. The message-delivery delays may exceed the medium-access delay bound even if a node transmits synchronous messages at a rate not greater than the guaranteed throughput. We solve this problem by developing a synchronous bandwidth allocation (SEA) scheme which calculates the synchronous bandwidth necessary for each application to satisfy its message-delivery delay requirement. The result obtained in this paper is essential for effective use of the FDDI token ring networks in supporting such real-time communication as digital video/audio transmissions, and distributed control/monitoring 相似文献
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Hard Real-Time Communication with the Timed Token Protocol: Current State and Challenging Problems 总被引:1,自引:0,他引:1
With the increasing use of distributed real-time systems, the ability of communication networks to handle real-time traffic is becoming more and more important. The timed token medium access control protocol, which has been now incorporated into several network standards such as FDDI and SAFENET due to its special timing property of bounded medium access time, is one of the most suitable and attractive candidate communication protocols for supporting distributed hard real-time applications. Extensive research has been conducted on using the timed token protocol to guarantee timely transmission of messages in a communication environment with hard real-time requirements. This paper intends to present a comprehensive review on recent advances in hard real-time communication with the timed token protocol. In addition, several challenging problems are identified. 相似文献
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一个以太网多媒体电视会议系统的实现 总被引:3,自引:0,他引:3
在基于FDDI的电视会议系统基础上,实现了一个基于以太网的电视会议系统,取得了良好的效果。春通信支持设施和网络通信软件的实现方法,并对实验结果进行了讨论。 相似文献
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传统车内通信系统的数据传输带宽、实时性和数据接入功能的局限已不能满足新一代车内通信设备的需求.本文提出一种基于光纤分布式数据接口总线方式的车内通信系统的实现方法,并给出了系统实现方案和测试数据.该系统的数据传输带宽、实时性和设备数据接人能力均能满足新一代车内各类通信设备的接入要求,且该方案已经产品化,实践应用证明该方案可行. 相似文献
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实时容错分布式计算机系统 总被引:1,自引:0,他引:1
介绍了一个由3个节点通过FDD连接而成的实时容错分布式计算机系统。它的每个节点是一个多机容错操作系统,具有分布处理和实时计算能力,此外,它具有多级重构及实时文件管理功能,并为用户提供了良好的配置工具,方便用户对系统的使用和开发。 相似文献
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Real-time communication in FDDI networks 总被引:2,自引:0,他引:2
This paper provides a comprehensive study of the use of FDDI networks to support real-time communication in mission-critical systems. Due to the potentially catastrophic results of failure in such systems, it is important to avoid message loss whenever possible. We develop efficient tests to check whether message loss may occur, either due to missing deadlines or due to buffer overflow. These tests are extremely useful in the design and operation of mission-critical systems using FDDI networks. Two types of tests are developed: message-parameter-based tests, which use detailed system knowledge to determine whether loss may occur, and utilization-based tests, which only require knowledge of the overall system load. In order to examine the system performance over a wide range of network loads, we also examine the probability that a randomly chosen message set will not suffer any loss. The work reported in this paper is compatible with the FDDI and SAFENET standards, and can be applied by engineers building real-time systems using these standards. 相似文献
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该文提出了一种分布式计算机监控系统的远程通信结构形式,设计研制了远程通信接口卡。采用远程通信接口卡组成的分布式计算机监控系统能够充分利用RS-232接口,节省多用户卡和调制解调器或数传机,具有结构简单、性能可靠等优点。 相似文献
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本文主要探讨WindowsNT环境下FDDI网络适配器驱动程序的实现技术。 相似文献
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Jenq Kuen Lee Ing-Kuen Tsaur San-Yih Hwang 《Journal of Parallel and Distributed Computing》1997,40(2):1425
This paper presents a parallel file object environment to support distributed array store on shared-nothing distributed computing environments. Our environment enables programmers to extend the concept of array distributions from memory levels to file levels. It allows parallel I/O that facilitates the distribution of objects in an application. When objects are read and/or written by multiple applications using different distributions, we present a novel scheme to help programmers to select the best data distribution pattern according to a minimum amount of remote data movements for the store of array objects on distributed file systems. Our selection scheme, to the best of our knowledge, is the first work to attempt to optimize the distribution patterns in the secondary storage for HPF-like programs with inter-application cases. This is especially important for a class of problems called multiple disciplinary optimization (MDO) problems. Our test bed is built on an 8-node DEC Farm connected with an ethernet, FDDI, or ATM switch. Our experimental results with scientific applications show that not only our parallel file system can provide aggregate bandwidths, but also our selection scheme effectively reduces the communication traffic for the system. 相似文献