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检索条件"任意字段=Abstracts of the 2018 ACM International Conference on Measurement and Modeling of Computer Systems"

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modeling, simulation and measurements of queuing delay under long-tail Internet traffic

Modeling, simulation and measurements of queuing delay under...

引用

acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Garetto, Michele Towsley, Don Dipartimento di Elettronica Politecnico di Torino Torino 10129 Italy Department of Computer Science University of Massachusetts Amherst MA 01003

ISBN: (纸本)1581136641

In this paper we describe an analytical approach for estimating the queuing delay distribution on an Internet link carrying realistic TCP traffic, such as that produced by a large number of finite-size connections transferring files whose sizes are taken from a long-tail distribution. The analytical predictions are validated against detailed simulation experiments and real network measurements. Despite its simplicity, our model proves to be accurate and robust under a variety of operating conditions, and offers novel insights into the impact on the network of long-tail flow length distributions. Our contribution is a performance evaluation methodology that could be usefully employed in network dimensioning and engineering. Copyright 2003 acm.

关键词： Queueing networks

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Analysis of TCP's computational energy cost for mobile computing

Analysis of TCP's computational energy cost for mobile compu...

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acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Wang, Bokyung Singh, Suresh Department of Computer Science Portland State University Portland OR 97207

ISBN: (纸本)1581136641

In this paper we present results from a measurement study of TCP (Transmission Control Protocol) running over a wireless link. Our primary goal was on obtaining a breakdown of the computational energy cost of TCP at the sender and receiver (excluding radio energy costs) as a first step in developing techniques to reduce this cost in actual systems. We analyzed the energy consumption of TCP in PreeBSD 5 running on a wireless laptop. Our initial results showed that 60 - 70% of the energy cost (for transmission or reception) is accounted for by the Kernel - NIC (Network Interface Card) copy operation. Of the remainder, ∼15% is accounted for in the copy operation from user space to kernel space with the remaining 15% being accounted for by TCP processing costs. We then further analyzed the TCP processing cost and determined the cost of computing checksums accounts for 20 - 30% of TCP processing cost.

关键词： Mobile computing

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Fluid models and solutions for large-scale IP networks

Fluid models and solutions for large-scale IP networks

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acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Liu, Yong Lo Presti, Francesco Misra, Vishal Towsley, Don Gu, Yu Computer Science Department University of Massachusetts Amherst MA 01003 Italy Computer Science Department Columbia University New York NY 10027

ISBN: (纸本)1581136641

In this paper we present a scalable model of a network of Active Queue Management (AQM) routers serving a large population of TCP flows. We present efficient solution techniques that allow one to obtain the transient behavior of the average queue lengths, packet loss probabilities, and average end-to-end latencies. We model different versions of TCP as well as different versions of RED, the most popular AQM scheme currently in use. Comparisons between our models and ns simulation show our models to be quite accurate while at the same time requiring substantially less time to solve, especially when workloads and bandwidths are high. Copyright 2003 acm.

关键词： Internet

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On the of effectiveness of movement prediction to reduce energy consumption in communication

On the of effectiveness of movement prediction to reduce ene...

引用

acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Chakraborty, Srijan Yau, David K. Y. Lui, John C. S. Department of Computer Sciences Purdue University West Lafayette IN Department of Computer Science Chinese University of Hong Kong Shatin Hong Kong

ISBN: (纸本)1581136641

Node movement can be exploited to reduce the energy consumption of wireless network communication. The strategy consists in delaying communication until a mobile node moves close to its target peer node, within an application-imposed deadline. We evaluate the performance of various heuristics that, based on the movement history of the mobile node, estimate an optimal time (in the sense of least energy use) of communication subject to the delay constraint. We evaluate the impact of node movement model, length of movement history maintained, allowable delay, single hop versus multiple hop communication, and size of data transfer on the energy consumption. We also present measurement results on an iPAQ pocket PC that quantify energy consumption in executing the prediction algorithms. Our results show that, with relatively simple and hence efficient prediction heuristics, energy savings in communication can significantly outweigh the energy expenses in executing the prediction algorithms.

关键词： Wireless telecommunication systems

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A hybrid systems modeling framework for fast and accurate simulation of data communication networks

A hybrid systems modeling framework for fast and accurate si...

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acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Bohacek, Stephan Hespanha, João P. Lee, Junsoo Obraczka, Katia Dept. Electrical and Comp. Eng. Univ. of Delaware Newark Dept. Electrical and Comp. Eng. Univ. of California Santa Barbara Dept. Comp. Science Univ. of Southern California Los Angeles Computer Engineering Dept. Univ. of California Santa Cruz

ISBN: (纸本)1581136641

In this paper we present a general hybrid systems modeling framework to describe the flow of traffic in communication networks. To characterize network behavior, these models use averaging to continuously approximate discrete variables such as congestion window and queue size. Because averaging occurs over short time intervals, one still models discrete events such as the occurrence of a drop and the consequent reaction (e.g., congestion control). The proposed hybrid systems modeling framework fills the gap between packet-level and fluid-based models: by averaging discrete variables over a very short time scale (on the order of a round-trip time), our models are able to capture the dynamics of transient phenomena fairly accurately. This provides significant flexibility in modeling various congestion control mechanisms, different queuing policies, multicast transmission, etc. We validate our hybrid modeling methodology by comparing simulations of the hybrid models against packet-level simulations. We find that the probability density functions produced by ns-2 and our hybrid model match very closely with an L1-distance of less than 1%. We also present complexity analysis of ns-2 and the hybrid model. These tests indicate that hybrid models are considerably faster. Copyright 2003 acm.

关键词： Telecommunication networks

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Using SimPoint for accurate and efficient simulation

Using SimPoint for accurate and efficient simulation

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acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Perelman, Erez Hamerly, Greg Van Biesbrouck, Michael Sherwood, Timothy Calder, Brad Department of Computer Science and Engineering University of California San Diego

ISBN: (纸本)1581136641

Modern architecture research relies heavily on detailed pipeline simulation. Simulating the full execution of a single industry standard benchmark at this level of detail takes on the order of months to complete. This problem is exacerbated by the fact that to properly perform an architectural evaluation requires multiple benchmarks to be evaluated across many separate runs. To address this issue we recently created a tool called SimPoint that automatically finds a small set of Simulation Points to represent the complete execution of a program for efficient and accurate simulation. In this paper we describe how to use the SimPoint tool, and introduce an improved SimPoint algorithm designed to significantly reduce the simulation time required when the simulation environment relies upon fast-forwarding.

关键词： computer architecture

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An empirical evaluation of wide-area Internet bottlenecks

An empirical evaluation of wide-area Internet bottlenecks

引用

acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Akella, Aditya Seshan, Srinivasan Shaikh, Anees Computer Science Department Carnegie Mellon University Pittsburgh PA 15213 Network Services and Software IBM T. J. Watson Research Center Hawthorne NY 10532

ISBN: (纸本)1581136641

Performance limitations in the current Internet are thought to lie at the edges of the network - i.e last mile connectivity to users, or access links of stub ASes. As these links are upgraded, however, it is important to consider where new bottlenecks and hot-spots are likely to arise. Through an extensive measurement study, we discover, classify and characterize non-access bottleneck links in terms of their location, latency and available capacity. We find that nearly half of the paths explored have a non-access bottleneck with available capacity less than 50 Mbps. The bottlenecks identified are roughly equally split between intra-ISP links and links between ISPs. These results have implications on issues such as the choice of access providers and route optimization.

关键词： Internet

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Run-time modeling estimation of operating power consumption

Run-time modeling estimation of operating power consumption

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acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Li, Tao John, Lizy Kurian Department of Electrical and Computer Engineering University of Texas at Austin Austin TX 78712

ISBN: (纸本)1581136641

The increasing constraints on power consumption in many computing systems point to the need for power modeling and estimation for all components of a system. The Operating System (OS) constitutes a major software component and dissipates a significant portion of total power in many modern application executions. Therefore, modeling OS power is imperative for accurate software power evaluation, as well as power management (e.g. dynamic thermal control and equal energy scheduling) in the light of OS-intensive workloads. This paper characterizes the power behavior of a commercial OS across a wide spectrum of applications to understand OS energy profiles and then proposes various models to cost-effectively estimate its run-time energy dissipation. The proposed models rely on a few simple parameters and have various degrees of complexity and accuracy. Experiments show that compared with cycle-accurate full-system simulation, the model can predict cumulative OS energy to within 1% accuracy for a set of benchmark programs evaluated on a high-end superscalar microprocessor. When applied to track runtime OS energy profiles, the proposed routine level OS power model offers superior accuracy than a simpler, flat OS power model, yielding per-routine estimation error of less than 6%. The most striking observation is the strong correlation between power consumption and the instructions per cycle (IPC) during OS routine executions. Since tools and methodology to measure IPC exist on modern microprocessors, the proposed models can estimate OS power for run-time dynamic thermal and energy management. Copyright 2003 acm.

关键词： Power electronics

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modeling the throughput of TCP Vegas

Modeling the throughput of TCP Vegas

引用

acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Samios, Charalampos Vernon, Mary K. Department of Computer Sciences University of Wisconsin Madison WI 53706

ISBN: (纸本)1581136641

Previous analytic models of TCP Vegas throughput have been developed for loss-free (all-Vegas) networks. This work develops a simple and accurate analytic model for the throughput of a TCP Vegas bulk transfer in the presence of packet loss, as a function of average round trip time, minimum round trip time, and loss rate for the transfer. Similar models have previously been developed for TCP Reno. However, several aspects of TCP Vegas need to be treated differently than their counterparts in Reno. The proposed model captures the key innovative mechanisms that Vegas employs during slow start, congestion avoidance, and congestion recovery. The results include (1) a simple, validated model of TCP Vegas throughput that can be used for equation-based rate control of other flows such as UDP streams, (2) a simple formula to determine, from the measured packet loss rate, whether the network buffers are over-committed and thus the TCP Vegas flow cannot reach the specified target lower threshold on throughput, (3) new insights into the design and performance of TCP Vegas, and (4) comparisons between TCP Vegas and TCP Reno including new insights regarding incremental deployment of TCP Vegas. Copyright 2003 acm.

关键词： Telecommunication networks

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Effects of clock resolution on the scheduling of interactive and real-time processes

Effects of clock resolution on the scheduling of interactive...

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acm SIGMETRICS 2003 - international conference on measurement and modeling of computer systems

作者： Etsion, Yoav Tsafrir, Dan Feitelson, Dror G. School of Computer Science and Engineering Hebrew University 91904 Jerusalem Israel

ISBN: (纸本)1581136641

It is commonly agreed that scheduling mechanisms in general purpose operating systems do not provide adequate support for modern interactive applications, notably multimedia applications. The common solution to this problem is to devise specialized scheduling mechanisms that take the specific needs of such applications into account. A much simpler alternative is to better tune existing systems. In particular, we show that conventional scheduling algorithms typically only have little and possibly misleading information regarding the CPU usage of processes, because increasing CPU rates have caused the common 100 Hz clock interrupt rate to be coarser than most application time quanta. We therefore conduct an experimental analysis of what happens if this rate is significantly increased. Results indicate that much higher clock interrupt rates are possible with acceptable overheads, and lead to much better information. In addition we show that increasing the clock rate can provide a measure of support for soft real-time requirements, even when using a general-purpose operating system. For example, we achieve a sub-millisecond latency under heavily loaded conditions. Copyright 2003 acm.

关键词： Scheduling

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