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检索条件"任意字段=PDSE 2000: International Symposium on Software Engineering for Parallel and Distributed Systems"

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Automatic mapping of control-intensive kernels onto coarse-grained reconfigurable array architecture with speculative execution

Automatic mapping of control-intensive kernels onto coarse-g...

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IEEE international symposium on parallel and distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Ganghee Lee Kyungwook Chang Kiyoung Choi Department of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

ISBN: (纸本)9781424465330

Coarse-grained reconfigurable array architectures have drawn increasing attention due to their good performance and flexibility. In general, they show high performance for compute-intensive kernel code, but cannot handle control-intensive parts efficiently, thereby degrading the overall performance. In this paper, we present automatic mapping of control-intensive kernels onto coarse-grained reconfigurable array architecture by using kernel-level speculative execution. Experimental results show that our automatic mapping tool successfully handles control-intensive kernels for coarse-grained reconfigurable array architecture. In particular, it improves the performance of the H.264 deblocking filters for luma and chroma over 26 and 16 times respectively compared to conventional software implementation. Compared to the approach using predicated execution, the proposed approach achieves 2.27 times performance enhancement.

关键词： Automatic control Kernel Computer architecture Finite impulse response filter parallel processing High performance computing Automatic voltage control Degradation software performance Control systems

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Integrating parallel application development with performance analysis in periscope

Integrating parallel application development with performanc...

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IEEE international symposium on parallel and distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Ventsislav Petkov Michael Gerndt Department of Informatics I10 Technische Universität München Garching Germany

ISBN: (纸本)9781424465330

High-performance computing (HPC) is making its way in every field of science and engineering by providing advanced methods for getting deeper comprehension of different processes and phenomena. However, due to the increased complexity of computer architectures and their multi-level parallelism, the development of efficient highly parallel applications is considerably complicated. This process has to be inevitably augmented with continuous performance analysis in order for one to be successful in optimizing applications and squeezing the potential out of today's supercomputers. Periscope is a distributed performance analysis tool capable of collecting and processing measurement data from large scale application runs. In comparison to other similar tools, Periscope provides high-level performance bottlenecks and not the low-level values of hardware counters. This paper presents an enhanced and powerful graphical user interface that was recently developed for Periscope. It was successfully integrated in the Eclipse development platform as a plug-in and takes advantage of one of its extensions - the parallel Tools Platform (PTP). This approach combines some of platform's advanced programming features with those of the Periscope performance measurement toolkit. As a result, a convenient software development and performance analysis environment was produced that aims at increasing the productivity of developers during the creation of highly efficient HPC applications.

关键词： Performance analysis Application software Computer architecture parallel processing Supercomputers Large-scale systems Hardware Counting circuits Graphical user interfaces Measurement

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parallel Task for parallelizing object-oriented desktop applications

Parallel Task for parallelizing object-oriented desktop appl...

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IEEE international symposium on parallel and distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Nasser Giacaman Oliver Sinnen Department of Electrical and Computer Engineering University of Auckland Auckland New Zealand

ISBN: (纸本)9781424465330

As multi-cores arrive for mainstream desktop systems, developers must invest the effort to parallelize their applications. We present parallel Task (short ParaTask), a solution to assist the parallelization of object-oriented applications, with the unique feature of including support for the parallelization of graphical user interface (GUI) applications. In the simple, but common, cases concurrency is introduced with a single keyword. Due to the wide variety of parallelization needs, ParaTask integrates different task types into the same model, provides intuitive support for dependence handling, non-blocking notification, interim progress notification and exception handling in an asynchronous environment as well as supporting a pluggable task scheduling runtime (currently work-sharing, work-stealing and a combination of the two are supported). The performance is compared to traditional Java parallelization approaches using a variety of different workloads.

关键词： Computer displays Graphical user interfaces Concurrent computing parallel processing Application software Object oriented modeling Multicore processing Processor scheduling Runtime

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Supporting Cloud Computing in Thin-Client/Server Computing Model

Supporting Cloud Computing in Thin-Client/Server Computing M...

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international symposium on parallel and distributed Processing with Applications, ISPA

作者： Gwan-Hwan Hwang Department of Computer Science and Information Engineering National Taiwan Normal University Taipei Taiwan

This paper addresses the issue of how to support cloud computing in thin-client/server computing model. We describe the design and implementation of the multiple-application-server thin-client/server computing (MAS TC/S) model that allows users with thin-client devices to roam around a wide area network whilst experiencing transparent working environments. MAS TC/S can be applied to a wide variety of applications in wide area network, such as pervasive software rental, service-oriented infrastructure for an Internet service provider, and office automation for transnational corporations. The MAS TC/S architecture model comprises five major components: the display protocol, the multiple-application-server topology, the application-server discovery protocol, the distributed file system, and the network input/output protocol. We discuss problems and present solutions in the design of each constituent component. A prototype of the MAS TC/S that spans the campuses of two universities in Taiwan has been built - we also report our experiences in constructing this prototype.

关键词： Servers Prefetching Protocols Computational modeling File systems Schedules Computer architecture

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Fine-grained QoS scheduling for PCM-based main memory systems

Fine-grained QoS scheduling for PCM-based main memory system...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Ping Zhou Yu Du Youtao Zhang Jun Yang Electrical and Computer Engineering Department University of Pittsburgh Pittsburgh PA USA Computer Science Department University of Pittsburgh Pittsburgh PA USA

ISBN: (纸本)9781424464425

With wide adoption of chip multiprocessors (CMPs) in modern computers, there is an increasing demand for large capacity main memory systems. The emerging PCM (Phase Change Memory) technology has unique power and scalability advantages and is regarded as a promising candidate among new memory technologies. When scheduling a mix of applications of different priority levels, it is often important to provide tunable QoS (Quality-of-Service) for the applications with high priority. However due to the slow PCM cell access, and the destructive interferences among concurrent applications, existing memory scheduling schemes lack the flexibility to tune QoS in a wide range, in particular to the level close or equal to that of standalone execution. In this paper we propose a novel QoS scheduling scheme that utilizes request preemption and row buffer partition that enable QoS tuning at a fine-granularity. That is, they can tune the request queuing time and the PCM bank service time for the high priority requests. Our experimental results show that the proposed scheme achieves 1.7× ~10× QoS tuning range while introducing negligible area and energy overheads.

关键词： Phase change materials Random access memory Application software Runtime Processor scheduling Power engineering computing Phase change memory Interference Bandwidth Costs

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An efficient Associative Processor solution to an Air Traffic Control problem

An efficient Associative Processor solution to an Air Traffi...

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IEEE international symposium on parallel and distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Mike Yuan Johnnie Baker Frank Drews Lev Neiman Will Meilander Department of Computer Science Kent University Kent OH USA School of Electrical EngineeringÙ5 and Computer Science Ohio University Athens OH USA

ISBN: (纸本)9781424465330

This paper proposes a SIMD solution to air traffic control (ATC) using an enhanced SIMD machine model called an Associative Processor (AP). This differs from previous ATC systems that are designed for MIMD computers and have a great deal of difficulty meeting the predictability requirements for ATC, which are critical for meeting the strict certification standards required for safety critical software components. The proposed SIMD solution will support accurate and meaningful predictions of worst case execution times and will guarantee all deadlines are met. Also, the software will be much simpler and smaller in size than the current corresponding ATC software. An important consequence of these features is that the V&V (Validation and Verification) process will be considerably simpler than for current ATC software. Additionally, the associative processor is enhanced SIMD hardware and is considerably cheaper and simpler than the MIMD hardware currently used to support ATC. The ClearSpeed CSX600 accelerator is used to emulate the AP model. A preliminary implementation of the proposed method has been developed and experimental results comparing MIMD and CSX600 approaches are presented. The performance of CSX600 has better scalability, efficiency, and predictability than that of MIMD.

关键词： Air traffic control Aircraft State estimation Computer science software safety Hardware Traffic control Environmental management Certification software standards

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Improving MapReduce performance through data placement in heterogeneous Hadoop clusters

Improving MapReduce performance through data placement in he...

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IEEE international symposium on parallel and distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Jiong Xie Shu Yin Xiaojun Ruan Zhiyang Ding Yun Tian James Majors Adam Manzanares Xiao Qin Department of Computer Science and Software Engineering Aubum University Auburn AL USA

ISBN: (纸本)9781424465330

MapReduce has become an important distributed processing model for large-scale data-intensive applications like data mining and web indexing. Hadoop-an open-source implementation of MapReduce is widely used for short jobs requiring low response time. The current Hadoop implementation assumes that computing nodes in a cluster are homogeneous in nature. Data locality has not been taken into account for launching speculative map tasks, because it is assumed that most maps are data-local. Unfortunately, both the homogeneity and data locality assumptions are not satisfied in virtualized data centers. We show that ignoring the data-locality issue in heterogeneous environments can noticeably reduce the MapReduce performance. In this paper, we address the problem of how to place data across nodes in a way that each node has a balanced data processing load. Given a dataintensive application running on a Hadoop MapReduce cluster, our data placement scheme adaptively balances the amount of data stored in each node to achieve improved data-processing performance. Experimental results on two real data-intensive applications show that our data placement strategy can always improve the MapReduce performance by rebalancing data across nodes before performing a data-intensive application in a heterogeneous Hadoop cluster.

关键词： Peer to peer computing Data processing Large-scale systems Data mining Indexing Open source software Facebook Programming profession Computer science software engineering

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Dense linear algebra solvers for multicore with GPU accelerators

Dense linear algebra solvers for multicore with GPU accelera...

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IEEE international symposium on parallel and distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Stanimire Tomov Rajib Nath Hatem Ltaief Jack Dongarra Department of Electrical Engineering and Computer Science University of Tennessee Knoxville USA

ISBN: (纸本)9781424465330

Solving dense linear systems of equations is a fundamental problem in scientific computing. Numerical simulations involving complex systems represented in terms of unknown variables and relations between them often lead to linear systems of equations that must be solved as fast as possible. We describe current efforts toward the development of these critical solvers in the area of dense linear algebra (DLA) for multicore with GPU accelerators. We describe how to code/develop solvers to effectively use the high computing power available in these new and emerging hybrid architectures. The approach taken is based on hybridization techniques in the context of Cholesky, LU, and QR factorizations. We use a high-level parallel programming model and leverage existing software infrastructure, e.g. optimized BLAS for CPU and GPU, and LAPACK for sequential CPU processing. Included also are architecture and algorithm-specific optimizations for standard solvers as well as mixed-precision iterative refinement solvers. The new algorithms, depending on the hardware configuration and routine parameters, can lead to orders of magnitude acceleration when compared to the same algorithms on standard multicore architectures that do not contain GPU accelerators. The newly developed DLA solvers are integrated and freely available through the MAGMA library.

关键词： Linear algebra Multicore processing Acceleration Iterative algorithms Linear accelerators Linear systems Equations Computer architecture Scientific computing Numerical simulation

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TiNy threads on BlueGene/P: Exploring many-core parallelisms beyond The traditional OS

TiNy threads on BlueGene/P: Exploring many-core parallelisms...

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IEEE international symposium on parallel and distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Handong Ye Robert Pavel Aaron Landwehr Guang R. Gao Department of Electrical and Computer Engineering University of Delaware Newark DE USA

ISBN: (纸本)9781424465330

Operating systems have been considered as a cornerstone of the modern computer system, and the conventional operating system model targets computers designed around the sequential execution model. However, with the rapid progress of the multi-core/manycore technologies, we argue that OSes must be adapted to the underlying hardware platform to fully exploit parallelism. To illustrate this, our paper reports a study on how to perform such an adaptation for the IBM BlueGene/P multi-core system. This paper's major contributions are threefold. First, we have proposed a strategy to isolate the traditional OS functions to a single core of the BG/P multi-core chip, leaving the management of the remaining cores to a runtime software that is optimized to realize the parallel semantics of the user application according to a parallel program execution model. Second, we have ported the TNT (TiNy Thread) execution model to allow for further utilization of the BG/P compute cores. Finally, we have expanded the design framework described above to a multi-chip system designed for scalability to a large number of chips. An implementation of our method has been completed on the Surveyor BG/P machine operated by Argonne National Laboratory. Our experimental results provide insight into the strengths of this approach: (1) The performance of the TNT thread system shows comparable speedup to that of Pthreads running on the same hardware; (2) The distributed shared memory operates at 95% of the experimental peak performance of the machine, with distance between nodes not being a sensitive factor; (3) The cost of thread creation shows a linear relationship as threads increase; (4) The cost of waiting at a barrier is constant and independent of the number of threads involved.

关键词： Multicore processing Operating systems parallel processing Concurrent computing Runtime Application software Scalability

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Agent placement in wireless embedded systems: Memory space and energy optimizations

Agent placement in wireless embedded systems: Memory space a...

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IEEE international symposium on parallel and distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Nikos Tziritas Thanasis Loukopoulos Spyros Lalis Petros Lampsas Computer & Communication Engineering Department University of Thessally Volos Greece Centre for Research and Technology슠Thessaly Volos Greece Department of Informatics & Computer Technology Technological Educational Institute of Lamia Lamia Greece

ISBN: (纸本)9781424465330

Embedded applications can be structured in terms of mobile agents that are flexibly installed on available nodes. In wireless systems, such nodes typically have limited battery and memory resources; therefore it is important to place agents judiciously. In this paper we tackle the problem of placing a newcomer agent in such a system. The problem has two main components. First, enough memory space must be found or created at some node to place the agent. Second, the placement should be energy efficient. We present heuristics for tackling these two goals in a stepwise fashion, as well as a branch and bound method for achieving both goals at the same time. Our algorithms are centralized assuming a single entry point through which agents are injected into the system, with adequate knowledge of the system state and enough resources to run the proposed algorithms. The algorithms are evaluated under different simulated scenarios, and the tradeoffs across the two metrics (space, energy) are identified.

关键词： Embedded system Application software Space technology Batteries Educational technology Embedded computing Home automation Wireless networks Dynamic programming Mobile communication

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