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检索条件"机构=Department of Computer Science Distributed Systems and Operating Systems"

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Accuracy and Dynamics of Hash-Based Load Balancing Algorithms for Multipath Internet Routing

Accuracy and Dynamics of Hash-Based Load Balancing Algorithm...

引用

International Conference on Broadband Networks (BroadNets)

作者： Ruediger Martin Michael Menth Michael Hemmkeppler Department of Distributed Systems Institute of Computer Science University of Wuerzburg Wurzburg Germany

This paper studies load balancing for multipath Internet routing. We focus on hash-based load balancing algorithms that work on the flow level to avoid packet reordering which is detrimental for the throughput of transport layer protocols like TCP. We propose a classification of hash-based load balancing algorithms, review existing ones and suggest new ones. Dynamic algorithms can actively react to load imbalances which causes route changes for some flows and thereby again packet reordering. Therefore, we investigate the load balancing accuracy and flow reassignment rate of load balancing algorithms. Our exhaustive simulation experiments show that these performance measures depend significantly on the traffic properties and on the algorithms themselves. As a consequence, our results should be taken into account for the application of load balancing in practice.

关键词： Load management Internet Routing Heuristic algorithms Throughput Transport protocols Telecommunication traffic Traffic control IP networks TCPIP

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Capacity requirements for the facility backup option in MPLS fast reroute

Capacity requirements for the facility backup option in MPLS...

引用

IEEE Workshop on High Performance Switching and Routing

作者： R. Martin M. Menth K. Canbolat Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

MPLS fast reroute (MPLS-FRR) mechanisms deviate the traffic in case of network failures at the router which is closest to the outage location to achieve an extremely fast reaction time. We review the facility backup that is an option for MPLS-FRR that deviates the traffic via a bypass around the failed elements. Basically, the backup path can take the shortest path that avoids the outage location from the point of local repair to the merge point with the primary path. We suggest two new simple modifications that lead to a new path layout which can be implemented by the facility backup. We evaluate the backup capacity requirements, the length of the backup paths, and the number of backup paths in a parametric study regarding the network characteristics. Our proposals save a considerable amount of backup capacity compared to the standard mechanisms. They are suitable for application in practice since they are simple and conform to the standards

关键词： Multiprotocol label switching Telecommunication traffic Resilience Protection Protocols Intelligent networks computer science Parametric study Proposals Capacity planning

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Gamma-approximation for the waiting time distribution function of the M/G/1-/spl infin/ queue

Gamma-approximation for the waiting time distribution functi...

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Conference on Next Generation Internet Networks, NGI

作者： M. Menth R. Henjes C. Zepfel P. Tran-Gia Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

In this paper we propose to approximate the waiting time distribution function (DF) of the waiting customers in a M/G/1-infin queuing system by a gamma-distribution whose parameters alpha and beta are set by means of the first and second moment of the waiting time that are obtained from the Takacs recursion formula. Discrete-time analysis (DTA) is another approximation approach for the same objective. We show first for analytically feasible special cases that DTA is very accurate and then we use it to validate the accuracy of the new gamma-approximation for wide parameter ranges regarding the service time distribution. We show that the gamma-approximation respects well even the third moment of the service time distribution. As the new approach is very simple and fast, it may be used by engineers with only little background in queuing theory to calculate quantiles for real-time control loops in technical systems

关键词： Distribution functions Queueing analysis Approximation methods Real time systems computer science Control systems Telecommunication control System testing

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Security considerations in space and delay tolerant networks

Security considerations in space and delay tolerant networks

引用

IEEE International Conference on Space Mission Challenges for Information Technology, SMC-IT

作者： S. Farrell V. Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

This paper reviews the Internet-inspired security work on delay tolerant networking, in particular, as it might apply to space missions, and identifies some challenges arising, for both the Internet security community and for space missions. These challenges include the development of key management schemes suited for space missions as well as a characterization of the actual security requirements applying. A specific goal of this paper is therefore to elicit feedback from space mission IT specialists in order to guide the development of security mechanisms for delay tolerant networking

关键词： Intelligent networks Disruption tolerant networking Space missions IP networks Protocols Data security Web and internet services computer security Space technology Cryptography

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Real-time coordination of autonomous vehicles

Real-time coordination of autonomous vehicles

引用

International Conference on Intelligent Transportation

作者： M. Bouroche B. Hughes V. Cahill Distributed Systems Group Computer Science Department Trinity College Dublin Ireland

Autonomous vehicles seem to be a promising approach to both reducing traffic congestion and improving road safety. However, for such vehicles to coexist safely, they need to coordinate their behaviour to ensure that they do not collide with each other. This coordination is typically based on (wireless) communication between vehicles and needs to satisfy stringent real-time constraints. However, realtime message delivery cannot be guaranteed in dynamic wireless networks which means that existing coordination models that rely on continuous connectivity cannot be employed. In this paper, we present a novel coordination model for autonomous vehicles that does not require continuous real-time connectivity between participants in order to ensure that system safety constraints are not violated. This coordination model builds on a real-time communication model for wireless networks that provides feedback to entities about the state of communication. The coordination model uses this feedback to ensure that vehicles always satisfy safety constraints, by adapting their behaviour when communication is degraded. We show that this model can be used to coordinate vehicles crossing an unsignalised junction

关键词： Remotely operated vehicles Mobile robots Vehicle safety Wireless networks Road vehicles Road safety Wireless communication Vehicle dynamics Real time systems State feedback

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Towards Delivering Context-Aware Transportation User Services

Towards Delivering Context-Aware Transportation User Service...

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International Conference on Intelligent Transportation

作者： R. Meier A. Harrington V. Cahill Distributed Systems Group the Department of Computer Science Trinity College Dublin Ireland

ITS architectures encourage integration of individual intelligent transportation systems into comprehensive platforms and enable sharing of information across a wide variety of systems and services. This paper presents a spatial programming model that has been designed as part of the iTransIT ITS framework to provide a standardized way to build value-added transportation user services and ultimately to deliver contextual transportation information to users. The spatial programming model is based on a topographical approach to modeling space that enables services to use potentially overlapping spatial context to correlate independently defined distributed information. This programming model has been evaluated by building a context-aware service for multi-modal urban journey planning

关键词： Context-aware services Context modeling Intelligent transportation systems Cities and towns Buildings Urban planning Information retrieval Traffic control Councils Intelligent structures

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Throughput Performance of Java Messaging Services Using WebsphereMQ

Throughput Performance of Java Messaging Services Using Webs...

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International Conference on distributed Computing systems Workshop

作者： R. Henjes M. Menth C. Zepfel Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

The Java messaging service (JMS) is a middlewareoriented messaging technology working according to the publish/ subscribe principle. If subscribers install filter rules on the JMS server, JMS can be used as a message routing platform, but it is not clear whether its message throughput is sufficiently high to support large-scale systems. In this paper we investigate the capacity of the Websphere Message Queue JMS server. In contrast to other studies, we focus on the message throughput in the presence of filters and show that filtering reduces the performance significantly. We also present a model that describes the service time for a single message depending on the number of installed filters and validate it by measurements. This model helps to calculate the system throughput for specific application scenarios.

关键词： Throughput Java Filters Message service Routing Large-scale systems Filtering Application software computer science Time measurement

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Analysis of the Message Waiting Time for the FioranoMQ JMS Server

Analysis of the Message Waiting Time for the FioranoMQ JMS S...

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International Conference on distributed Computing systems

作者： M. Menth R. Henjes Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

The Java messaging service (JMS) is a means to organize communication among distributed applications according to the publish/subscribe principle. If the subscribers install filter rules on the JMS server, JMS can be used as a message routing platform, but it is not clear whether its message throughput is sufficiently high to support large-scale systems. We perform measurements for the FioranoMQ JMS server and derive a simple model for its message processing time that takes message filters and the message replication grade into account. Then, we analyze the JMS server capacity and the message waiting time for various application scenarios. We show that the message waiting time is not an issue as long as the server throughput is sufficiently high. Finally, we assess the capacity of two different distributed JMS architectures whose objective is to increase the capacity of the JMS beyond the limit of a single server.

关键词： Throughput Message service Java Filters Time measurement Application software Routing Large-scale systems computer architecture Predictive models

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Network Dimensioning for the Self-Protecting Multipath: A Performance Study

Network Dimensioning for the Self-Protecting Multipath: A Pe...

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IEEE International Conference on Communications (ICC)

作者： Michael Menth Ruediger Martin Ulrich Spoerlein Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

The self-protecting multipath (SPM) is a simple protection switching mechanism that can be implemented, e.g., by MPLS. We present a linear program to optimize the SPM load balancing parameters for network dimensioning. Our study shows that the SPM is a very efficient mechanism in the sense that it requires only little backup capacity since it outperforms the p-cycle approach and the shortest path rerouting by far. The investigation of the computation time and the memory consumption recommends the Simplex method as an LP solver rather than an interior point method (IPM). The computation time of the program depends mainly on the number of links in the network and it is well feasible for small and and medium size networks. For large networks, however, fast heuristics are required.

关键词： Scanning probe microscopy Protection switching Telecommunication traffic Load management Multiprotocol label switching Resilience Routing Availability Quality of service computer science

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The Robot Software Communications Architecture (RSCA): Embedded middleware for networked service robots 20

The Robot Software Communications Architecture (RSCA): Embed...

引用

20th IEEE International Parallel and distributed Processing Symposium, IPDPS 2006

作者： Hong, Seongsoo Lee, Jaesoo Eom, Hyeonsang Jeon, Gwangil Real-Time Operating Systems Laboratory School of Electrical Engineering and Computer Science Seoul National University Seoul 151-744 Korea Republic of Distributed Information Processing Laboratory School of Computer Science and Computer Engineering Seoul National University Seoul 151-744 Korea Republic of Department of Computer Engineering Korea Polytechnic University 2121 Jungwang-Dong Siheung-Si Gyunggi-Do 429-793 Korea Republic of

ISBN: (纸本)1424400546

In this paper, we present a robot middleware technology named Robot Software Communications Architecture (RSCA) for its use in networked home service robots. The RSCA provides a standard operating environment for the robot applications together with a framework that expedites the development of such applications. The operating environment is comprised of a real-time operating system, a communication middleware, and a deployment middleware. Particularly, the deployment middleware supports the reconfiguration of component-based robot applications including installation, creation, start, stop, tear-down, and un-installation, In designing RSCA, we have adopted a middleware called SCA from the software defined radio domain and extend it since the original SCA lacks the real-time guarantees and appropriate event services. We have fully implemented RSCA and performed measurements to quantify its run-time performance. Our implementation clearly shows the viability of RSCA. © 2006 IEEE.

关键词： Middleware

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