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2006 IEEE 63rd Vehicular Technology Conference, VTC 2006-Spring

作者： Kyungtae, Kim Ganguly, Samrat Izmailov, Rauf Sangjin, Hong IP Network and Distributed Systems NEC Laboratories America Princeton NJ 08540 Mobile Systems Design Laboratory Department of Electrical and Computer Engineering State University of NY Stony Brook NY 11794

ISBN: (纸本)0780393929

Performance in multihop wireless networks is known to degrade with the number of hops for both TCP and UDP traffic. For VoIP, the wireless network presents additional challenges as the perceived quality is dependent on loss, delay and jitter. Furthermore, small size of VoIP packets aggravates network utilization of the 802.11 based wireless mesh network. In this work, we evaluate the packet aggregation algorithms to reduce VoIP protocol overhead, compare the aggregation algorithms and propose a distributed packet aggregation mechanism. The experimental results demonstrates that the proposed distributed packet aggregation algorithm improves the VoIP quality and results in significant increase in the number high quality VoIP calls supported over multihop mesh. © 2006 IEEE.

关键词： Wireless networks

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A heterogeneous environment for hardware/software cosimulation

A heterogeneous environment for hardware/software cosimulati...

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Annual Symposium on Simulation

作者： W.D. Bishop W.M. Loucks Parallel and Distributed Systems Group Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

A heterogeneous environment for hardware/software cosimulation is described. This environment permits a portion of an application's subsystems to be simulated using reconfigurable hardware while the remainder of the subsystems are simulated using software. An Aptix FPCB populated with Xilinx FPGAs serves as the hardware simulation platform while an IBM-compatible PC serves as the software simulation platform. The two platforms are connected using an Altera reconfigurable logic board which allows the development of a high-speed interface for communication. This paper focuses on the difficulties associated with designing and interfacing simulation entities in this heterogeneous environment. Strategies for designing hardware and software simulation entities are introduced. These strategies reduce the impact of size and performance constraints imposed by the cosimulation environment while addressing the issues of time management and synchronization. A simple queueing application is used to illustrate a design methodology which incorporates these design strategies.

关键词： Hardware Engines Application software Emulation Computational modeling Logic Digital signal processing Field programmable gate arrays Software design Environmental management

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Streaming 4K/UHD video to the rest of us: Can bandwidth sharing help? 16

Streaming 4K/UHD video to the rest of us: Can bandwidth shar...

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16th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, WoWMoM 2015

作者： Montes, Isabel Chua, Jaymari Cruz, Michelangelo Remillano, Augusto Young, Joseph Darwin Ocampo, Roel Festin, Cedric Computer Networks Laboratory Electrical and Electronics Engineering Institute University of the Philippines Diliman Philippinese United States Networks and Distributed Systems Group Department of Computer Science University of the Philippines Diliman Philippinese United States

ISBN: (纸本)9781479984619

High quality video streaming for mobile users is difficult to achieve in some areas of the world due to poor broadband capacity and sparse network coverage. We propose a bandwidth-sharing scheme to allow users with limited uplink bandwidth to borrow idle bandwidth from nearby access points and provide these users the opportunity to experience higher quality video than what their own bandwidth could normally support. We developed a Linux kernel implementation of a multipath less-than-best-effort (MP-LBE) protocol for bandwidth scavenging and demonstrated, through testbed experiments, that video quality may be improved through bandwidth sharing. This may bring us closer to the 'video everywhere' vision even as incremental upgrades are made on broadband Internet infrastructure. © 2015 IEEE.

关键词： Video streaming

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A distributed Multi-Storage Resource Architecture and I/O Performance Prediction for Scientific Computing

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Cluster Computing 2003年第3期6卷 189-200页

作者： Shen, X. Choudhary, A. Matarazzo, C. Sinha, P. Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston USA Lawrence Livermore National Laboratory Livermore USA

I/O intensive applications have posed great challenges to computational scientists. A major problem of these applications is that users have to sacrifice performance requirements in order to satisfy storage capacity requirements in a conventional computing environment. Further performance improvement is impeded by the physical nature of these storage media even when state-of-the-art I/O optimizations are employed. In this paper, we present a distributed multi-storage resource architecture, which can satisfy both performance and capacity requirements by employing multiple storage resources. Compared to a traditional single storage resource architecture, our architecture provides a more flexible and reliable computing environment. This architecture can bring new opportunities for high performance computing as well as inherit state-of-the-art I/O optimization approaches that have already been developed. It provides application users with high-performance storage access even when they do not have the availability of a single large local storage archive at their disposal. We also develop an Application Programming Interface (API) that provides transparent management and access to various storage resources in our computing environment. Since I/O usually dominates the performance in I/O intensive applications, we establish an I/O performance prediction mechanism which consists of a performance database and a prediction algorithm to help users better evaluate and schedule their applications. A tool is also developed to help users automatically generate performance data stored in databases. The experiments show that our multi-storage resource architecture is a promising platform for high performance distributed computing.

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A 64-bit, shared disk file system for Linux

A 64-bit, shared disk file system for Linux

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IEEE Symposium on Mass Storage systems

作者： K.W. Preslan A.P. Barry J.E. Brassow G.M. Erickson E. Nygaard C.J. Sabol S.R. Soltis D.C. Teigland M.T. O'Keefe Parallel Computer Systems Laboratory Department of Electrical and Computer Engineering University of Minnesota USA

In computer systems today, speed and responsiveness is often determined by network and storage subsystem performance. Faster, more scalable networking interfaces like Fibre Channel and Gigabit Ethernet provide the scaffolding from which higher performance implementations may be constructed, but new thinking is required about how machines interact with network-enabled storage devices. We have developed a Linux file system called GFS (the Global File System) that allows multiple Linux machines to access and share disk and tape devices on a Fibre Channel or SCSI storage network. We plan to extend GFS by transporting packetized SCSI commands over IP so that any GFS-enabled Linux machine can access shared network devices. GFS will perform well as a local file system, as a traditional network file system running over LP, and as a high-performance cluster file system running over storage networks like Fibre Channel. GFS device sharing provides a key cluster-enabling technology for Linux, helping to bring the availability, scalability, and load balancing benefits of clustering to Linux. Our goal is to develop a scalable, (in number of clients and devices, capacity, connectivity, and bandwidth) server-less file system that integrates IF-based network attached storage (NAS) and Fibre-Channel-based storage area networks (SAN). We call this new architecture Storage Area InterNetworking (SAINT). It exploits the speed and device scalability of SAN clusters, and provides the client scalability and network interoperability of NAS appliances. Our Linux port shows that the GFS architecture is portable across different platforms, and we are currently working on a port to NetBSD. The GFS code is open source (GPL) software freely available on the Internet at http://***.

关键词： File systems Linux Optical fiber devices Scalability Storage area networks computer networks Delay Ethernet networks Availability Load management

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Cooperative caching in append-only databases with hot spots

Cooperative caching in append-only databases with hot spots

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International Conference on Data engineering

作者： A. Sinha C. Chase M. Cochinwala Parallel and Distributed Systems Laboratory Electrical and Computer Engineering University of Texas Austin USA Bellcore Morristown NJ USA

We measure the performance of several cooperative caching policies for a database with hot spots. The workload consists of queries and append-only update transactions, and is modeled after a financial database of stock (historical) trading information. We show that cooperative caching is effective for this application. We show that selecting the correct set of peer servers when servicing a cache miss is crucial to achieving high performance, and we demonstrate a greedy algorithm that performs close to optimal for this workload. We also evaluate several cache replacement policies and show that a 2nd-chance algorithm performs best. In a 2nd-chance algorithm, replaced pages are transferred to a peer server rather than being discarded. When a page is selected for replacement a 2nd time, the page is discarded. Our results can be applied in the design of proxy servers for databases or Web servers where a layer of proxy servers are used to scale the system performance.

关键词： Cooperative caching Databases Laboratories Electric variables measurement Page description languages Bandwidth Broadcasting

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Design and evaluation of an environment APE for automatic parallelization of programs

Design and evaluation of an environment APE for automatic pa...

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International Symposium on parallel Architectures, Algorithms and Networks (ISPAN)

作者： V. Chaudhary Chengzhong Xu S. Roy Jialin Ju V. Sinha Laiwu Luo Parallel and Distributed Computing Laboratory Department of Electrical and Computer Engineering Wayne State University MI USA

In this paper, we present the design and evaluation of a compiler system, called APE, for automatic parallelization of scientific and engineering applications on distributed memory computers. APE is built on top of SUIF compiler. It extends SUIF with capabilities in parallelizing loops with non-uniform cross-iteration dependencies, and in handling loops that have indirect access patterns. We have evaluated the effectiveness of SUIF with several CFD test codes, and found that SUIF handles uniform loops over dense and regular data structures very well. For non-uniform loops, an innovative and efficient parallelization approach based on convex theory have been proposed and is being implemented. We have also presented a class of scalable algorithms for parallel distribution and redistribution of unstructured data structures during parallelizing irregular loops.

关键词： Program processors distributed computing Concurrent computing Computational fluid dynamics Data structures Quantum computing Programming profession parallel processing Design engineering Optimizing compilers

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A fusion-based approach for tolerating faults in finite state machines

A fusion-based approach for tolerating faults in finite stat...

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International Symposium on parallel and distributed Processing (IPDPS)

作者： Vinit Ogale Bharath Balasubramanian Vijay K. Garg Parallel and Distributed Systems Laboratory Department of Electrical and Computer Engineering University of Texas Austin USA IBM India Research Laboratory New Delhi India

ISBN: (纸本)9781424437511

Given a set of n different deterministic finite state machines (DFSMs) modeling a distributed system, we examine the problem of tolerating f crash or Byzantine faults in such a system. The traditional approach to this problem involves replication and requires n middot f backup DFSMs for crash faults and 2 middot n middot f backup DFSMs for Byzantine faults. For example, to tolerate two crash faults in three DFSMs, a replication based technique needs two copies of each of the given DFSMs, resulting in a system with six backup DFSMs. In this paper, we question the optimality of such an approach and present an approach called (f, m)-fusion that permits fewer backups than the replication based approaches. Given n different DFSMs, we examine the problem of tolerating f faults using just m additional DFSMs. We introduce the theory of fusion machines and provide an algorithm to generate backup DFSMs for both crash and Byzantine faults. We have implemented our algorithms in Java and have used them to automatically generate backup DFSMs for several examples.

关键词： Automata computer crashes Laboratories Concurrent computing distributed computing Fusion power generation Standby generators Thermal sensors Counting circuits Java

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A critique of java for concurrent programming

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IEEE distributed systems Online 2005年第9期6卷

作者： Garg, Vijay K. Mittal, Neeraj University of Texas Austin University of Texas Dallas Electrical and Computer Engineering Department University of Texas Austin University's Parallel Distributed Systems Laboratory Department of Computer Science University of Texas Dallas

A comparative study between Java and Avaj, a concurrent programming language, is presented. java uses wait (), notify (), and notifyAll () construct to support monitors, while Avaj simply supports the construct await (B), where B is any Boolean expression. The syntax for the Avaj abort () construct is simple and allows programmer to call abort () inside any method. Avaj also incorporates the selective communication construct in the language. The invariant (B) construct in Avaj allows a Boolean expression to be invariant in a program.

关键词： Java programming language

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Scheduling parallel applications on Utility Grids: Time and cost trade-off management

Scheduling parallel applications on Utility Grids: Time and ...

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32nd Australasian computer Science Conference, ACSC 2009

作者： Garg, Saurabh Kumar Buyya, Rajkumar Siegel, H.J. Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC 3010 Australia Electrical and Computer Engineering Department Colorado State University Fort Collins United States Computer Science Department Colorado State University Fort Collins United States

ISBN: (纸本)9781920682729

With the growth of Utility Grids and various Grid market infrastructures, the need for efficient and cost effective scheduling algorithms is also increasing rapidly, particularly in the area of meta-scheduling. In these environments,users not only may have conflicting requirements with other users, but also they have to manage the trade-off between time and cost such that their applications can be executed most economically in the minimum time. Thus, choosing of the best Grid resources becomes a challenge in such a competitive market. This paper presents two novel heuristics for scheduling parallel applications on Utility Grids that manage and optimize the trade-off between time and cost constraints. The performance of the heuristics is evaluated through extensive simulations of a real-world environment with real parallel workload models to demonstrate the practicality of our algorithms. We compare our scheduling algorithms against other common algorithms used by current meta-schedulers. The results shows that our algorithms outperform other algorithms by minimizing the time and cost of application execution on Utility Grids. Copyright © 2009, Australian computer Society, Inc.

关键词： Scheduling algorithms

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