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RIMP: Runtime IMplicit Predication

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6th International Workshop on Advanced parallel processing Technologies

作者： Tang, Y Deng, K Wang, XD Dou, Y Zhou, XM National Lab. for Parallel and Distributed Processing China

ISBN: (纸本)3540296395

If-conversion and predicated execution are widely adopted to eliminate branch misprediction penalty. Previous predication execution depends on compiler to generate explicit predicated instructions, In this paper, a trace-based predicate mechanism named RIMP (Runtime IMplicit Predication) is discussed. The candidates of if-conversion will be identified during dynamic execution. Conventional trace cache has been modified to store RIMP traces, which include instructions both from fall-through and target block following the conditional branch. Hardware extension will add predication to RIMP trace automatically. With the help of RIMP, legacy applications can benefit from predication mechanism without recompiling source code. Simulation of RIMP implementation under diverse microarchitecture configurations is presented in the paper. Results have shown promising performance improvement. In general, RIMP with 64kB trace storage delivers an average 10.3% IPC improvement while actually speeding up the execution time by over 7%.

关键词： predication trace cache runtime execution RIMP

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Reduction transformations for optimization parameter selection

Reduction transformations for optimization parameter selecti...

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8th International Conference on High-Performance Computing in Asia-Pacific Region, HPC Asia 2005

作者： Yonggang, Che Zhenghua, Wang Xiaomei, Li National Lab. for Parallel and Distributed Processing Changsha 410073 China

ISBN: (纸本)0769524869

Program performance optimization often involves choosing right parameters to minimize the program's runtime. Selecting optimization parameters by means of execution-driven search is guaranteed to find excellent results, for it accurately accounts for all performance components of the target platform. But the major drawback of execution-driven approach is the excessive compilation time due to thousands of runs of the original program. In this article, we propose a novel technique called program reduction transformations to reduce the cost of execution-driven optimization parameter selection. It is based on our observation to the characteristics of the scientific applications and the optimization parameter selection task. The ideal is to transform the program before it is used in execution-driven parameter selection procedure. The transformed program runs in much shorter time but preserves the parameter selection quality. This technique greatly reduces the time spent on evaluating each candidate parameter and makes execution-driven optimization parameter selection affordable. We formulate the theoretic foundation of program reduction transformation. And we find several situations where reduction transformations can be legally applied. These situations are common in scientific applications. Experiments done for two math kernels and three SPEC benchmarks show that our approach is both feasible and effective. © 2005 IEEE.

关键词： Parameter estimation

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Improving cluster computing performance based on job futurity prediction

Improving cluster computing performance based on job futurit...

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2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010

作者： Salami, Hossein Saadatfar, Hamid Fard, Farhad Rahmani Shekofteh, S. Kazem Deldari, Hossein Parallel and Distributed Processing Lab. Engineering Department Ferdowsi University of Mashhad Mashhad Iran

ISBN: (纸本)9781424465408

By recognizing the necessity for preventative and proactive management for today's large scale and fault prone distributed systems, a tendency for these mechanisms has been appeared in recent researchers' efforts. From the birth point of this opinion, event prediction has been known as an effective approach to manage errors preventively. In this work, we attempt to make system performance better by using a job futurity predictor as an advisor for system scheduler. We have a clear sighted vision of failure sources and therefore use a comprehensive data set of system, user and job domains. Using predictor results leads to a significant improvement in performance metrics. © 2010 IEEE.

关键词： Forecasting

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JSM: Job submission manager for large-scale distributed systems based on game theory

JSM: Job submission manager for large-scale distributed syst...

引用

2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010

作者： Saadatfar, Hamid Salami, Hossein Deldari, Hossein Mashhadi, Habib Rajabi Fard, Farhad Rahmani Parallel and Distributed Processing Lab. Engineering Department Ferdowsi University of Mashhad Mashhad Iran

ISBN: (纸本)9781424465408

Nowadays by improving the richness of prediction methods and accessing to the more information about systems behavior, the role of proactive strategies in developing more reliable and efficient systems becomes more crucial. However, the goals of prediction and the way that the results can be employed to upgrade the system are still topics which draw recent researchers' attention. In this work, we attempt to decrease Jobs wait time and failure rate by using the results of a job futurity predictor. For achieving this goal, a system component called JSM is proposed. JSM consults the predictor and employs a game theory based model in order to probably rejecting the jobs which are likely to fail. Furthermore, for avoiding from rejecting safety jobs mistakenly, JSM intelligently adopts its decisions with the systems situations. Experimental results state a significant reduction in jobs wait time and failure rate in comparison with other related work. © 2010 IEEE.

关键词： Forecasting

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Implementing Sparse Matrix-Vector multiplication using CUDA based on a hybrid sparse matrix format

Implementing Sparse Matrix-Vector multiplication using CUDA ...

引用

2010 International Conference on Computer Application and System Modeling, ICCASM 2010

作者： Cao, Wei Lu, Yao Li, Zongzhe Wang, Yongxian Wang, Zhenghua National Key Lab. for Parallel and Distributed Processing National University of Defense Technology Changsha China

ISBN: (纸本)9781424472369

The Sparse Matrix-Vector product (SpMV) is a key operation in engineering and scientific computing. Methods for efficiently implementing it in parallel are critical to the performance of many applications. Modern Graphics processing Units (GPUs) coupled with the advent of general purpose programming environments like NVIDIA's CUDA, have gained interest as a viable architecture for data-parallel general purpose computations. Currently, SpMV implementations using CUDA based on common sparse matrix format have already appeared. Among them, the performance of implementation based on ELLPACK-R format is the best. However, in this implementation, when the maximum number of nonzeros per row does substantially differ from the average, thread is suffering from load imbalance. This paper proposes a new matrix storage format called ELLPACK-RP, which combines ELLPACK-R format with JAD format, and implements the SpMV using CUDA based on it. The result proves that it can decrease the load imbalance and improve the SpMV performance efficiently. © 2010 IEEE.

关键词： Graphics processing unit

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Efficient virtual machine deployment in large scale resource environment

Efficient virtual machine deployment in large scale resource...

引用

16th IEEE International Conference on parallel and distributed Systems, ICPADS 2010

作者： Huang, Feng Li, Dongsheng National Lab. for Parallel and Distributed Processing College of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9780769543079

Combining virtual machine technology, virtual computing is able to effectively aggregate the widely distributed resources to provide users services. We view the federation of multiple data centers and voluntary resources on the Internet as a very large scale resource pool. Based on the tree structure of the pool, this paper proposes a virtual machine deployment algorithm, called iVDA, considers users' requests and the capabilities of the physical resources as well as the dynamic load, implements an adaptive mechanism to scheduling servers to host virtual machines forming virtual execution environments for various applications, and supports on-demand computing. © 2010 IEEE.

关键词： Dynamic loads

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An improved independent set ordering algorithm for solving large-scale sparse linear systems

An improved independent set ordering algorithm for solving l...

引用

International Conference on Intelligent Human-Machine Systems and Cybernetics

作者： Yao, Lu Cao, Wei Li, Zongzhe Wang, Yongxian Wang, Zhenghua National Key Lab. for Parallel and Distributed Processing National Univ. of Defense Technology Changsha China

ISBN: (纸本)9780769541518

The independent set ordering algorithm is a heuristic algorithm based on finding maximal independent sets of vertices in the matrix adjacency graph, which is commonly used for parallel matrix factorization. However, Disadvantages appear when it is applied to large-scale sparse linear systems. In this paper, we propose an improved algorithm by finding an optimal size of independent set in each elimination step rather than find a maximal independent set, which is proved to be effective by both theoretical analysis and parallel implementation. © 2010 IEEE.

关键词： Lower-upper decomposition

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Formal Proof for a General Architecture of Hybrid Prefix/Carry-Select Adders

Formal Proof for a General Architecture of Hybrid Prefix/Car...

引用

10th International Conference on Algorithms and Architectures for parallel processing

作者： Liu, Feng Tan, Qingping Song, Xiaoyu Chen, Gang National Lab. of Parallel Distributed Processing Hunan China ECE Department Portland State University Portland OR United States Lingcore Lab. Portland OR United States

ISBN: (纸本)9783642131189

In this paper, we present a general architecture of hybrid prefix/carry-select adder. Based on this architecture, we formalize the hybrid adder's algorithm using the first-order recursive equations and develop a proof framework to prove its correctness. Since several previous adders in the literature are special cases of this general architecture, our methodology can be used to prove the correctness of different hybrid prefix/carry-select adders. The formal proof for a special hybrid prefix/carry-select adder shows the effectiveness of the algebraic structures built in this paper.

关键词： Adders

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Skyline query processing on interval uncertain data

Skyline query processing on interval uncertain data

引用

作者： Li, Xiaoyong Wang, Yijie Li, Xiaoling Wang, Guangdong National Lab. for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha China

ISBN: (纸本)9780769546698

Many recent applications involve processing and analyzing uncertain data. Recently, several research efforts have addressed answering skyline queries efficiently on massive uncertain datasets. However, the research lacks methods to compute these queries on uncertain data, where each dimension of the uncertain object is represented as an interval or an exact value. In this paper, we extensively study the problem of skyline query on these interval based uncertain objects, which has never been studied before. We first model the problem of querying the skylines on interval datasets. Typically, we address two efficient algorithms with I/O optimal for the conventional interval skyline queries and constrained interval skyline queries, respectively. Extensive experiments demonstrate the efficiency of all our proposed algorithms. © 2012 IEEE.

关键词： Query processing

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Creating virtual networks for distributed virtual computing environment

Creating virtual networks for distributed virtual computing ...

引用

15th International Conference on parallel and distributed Systems, ICPADS '09

作者： Li, Dongsheng Chen, Yixin Huang, Feng National Lab. for Parallel and Distributed Processing College of Computer National University of Defense Technology Changsha City Hunan Province China

ISBN: (纸本)9780769539003

Virtual network is an important approach to support multiple legacy applications running unmodified in distributed virtual computing environments. A virtual networking approach called VirNet is proposed in this paper. VirNet can build multiple customized and isolated virtual networks simultaneously on the same physical hosts in the network, and it enables existing distributed applications written for LANs to run seamlessly on Internet. VirNet is designed completely in user space and requires no change to the kernel of operating systems. Experimental evaluation performed by a reference implementation shows that VirNet is efficient. The latency overhead caused by VirNet is very small and the bandwidth of VirNet is more than 85% of the availab.e physical network bandwidth in both the LAN and emulated WAN environments. © 2009 IEEE.

关键词： Taps

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