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Design of New Hash Mapping Functions

Design of New Hash Mapping Functions

引用

International Conference on computer and Information technology (CIT)

作者： Fenglong Song Zhiyong Liu Dongrui Fan Junchao Zhang Lei Yu Nan Yuan Wei Lin Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China

Conflict can decrease performance of computer severely, such as bank conflicts reduce bandwidth of interleave multibank memory systems and conflict misses reduce effective on-chip capacity, and this incurs much conflict miss further. Conflicts can be avoided by a suitable address mapping scheme which maps the most frequently occurring patterns conflict-free. In this paper, we present a new XOR-based mapping scheme, called XORM, which focuses on multi-bank shared cache of on-chip many-core architecture. The XORM mapping scheme can map arbitrary bits of address to set indices and compute each set index bit as XOR of a transpositional subset of the bits in the address. Then, we analyze necessary characteristics of an address mapping scheme to avoid conflict in many-core architecture. Next, we give a case study to design optimal hash functions based on XORM scheme for skewed-associative cache. Finally, we introduce another case study, in which we illustrate how to design an XORM mapping scheme with lower implementation cost, complexity and computing latency in shared cache of chipped many-core architecture. The evaluated results show the effectiveness of XORM mapping scheme.

关键词： computer architecture Delay Bandwidth Costs Information technology Laboratories system-on-a-chip Hardware High performance computing Polynomials

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Study on Fine-Grained Synchronization in Many-Core architecture

Study on Fine-Grained Synchronization in Many-Core Architect...

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ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing (SNPD)

作者： Lei Yu Zhiyong Liu Dongrui Fan Fenglong Song Junchao Zhang Nan Yuan Chinese Academy of Sciences Beijing Beijing CN Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China

The synchronization between threads has serious impact on the performance of many-core architecture. When communication is frequent, coarse-grained synchronization brings significant overhead. Thus, coarse-grained synchronization is not suitable for this situation. However, the overhead of fine-grained synchronization is still small when the communication is frequent. For the many-core architecture which supports fine-grained synchronization with on-chip storage, we propose fine-grained synchronization algorithms for scientific computation application 2-D wavefront and LU decomposition. At first, according to the memory access mode, an efficient method of data allocation is proposed. Then, way of thread partition and synchronization are discussed. Finally, we estimate the two algorithms based on Godson-T many-core architecture. The results of experiments show that the relative speedup is almost linear and the execution time is only 53.2 % of the coarse-grained synchronization. After the global barriers are eliminated, LU decomposition achieved 13.1% performance improvement. Moreover, the experiments prove that the fine-grained mechanism is able to improve the performance of processor and it has a good scalability.

关键词： Frequency synchronization computer architecture Yarn Parallel processing Distributed computing Concurrent computing Delay Programming profession Partitioning algorithms Wire

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Evaluation Method of Synchronization for Shared-Memory On-Chip Many-Core Processor

Evaluation Method of Synchronization for Shared-Memory On-Ch...

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International Symposium on Parallel and Distributed Processing with Applications, ISPA

作者： Fenglong Song Zhiyong Liu Dongrui Fan He Huang Nan Yuan Lei Yu Junchao Zhang Chinese Academy of Sciences Beijing Beijing CN Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China

On-chip many core architecture is an emerging and promising computation platform. High speed on-chip communication and abundant chipped resources are two outstanding advantages of this architecture, which provide an opportunity to implement efficient synchronization scheme. The practical execution efficiency of synchronization scheme is critical to this platform. However, there are few researches on systematic evaluation method of choice synchronization schemes for on-chip many core processors, and effect of dedicated hardware support in this context. So we focus on the evaluation method and criterion of synchronization scheme on the platform. Firstly, we present several criterions proper to on-chip many core architecture, that is, absolute overhead of synchronization operation, the transferring time between different synchronization operations, overhead caused by load imbalance, and the network congestion caused by synchronization operation. Secondly, we illustrate how to design microbenchmarks which one dedicated to evaluate a performance criterion respectively. Finally, we implement these microbenchmarks and synchronization schemes on an on-chip many core processor with shared level-two cache and AMD Opteron commercial chip multi-processor, respectively. And we analyze effect of dedicated hardware support. Results show that the most overhead of synchronization is caused by load imbalance and serialization on synchronization point. It also shows that synchronization scheme supported with dedicated hardware can improve its performance obviously for chipped many-core processor.

关键词： computer architecture Hardware Yarn Costs system-on-a-chip Concurrent computing Distributed computing Network-on-a-chip Distributed processing Application software

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A case study of improving at-speed testing coverage of a gigahertz microprocessor

A case study of improving at-speed testing coverage of a gig...

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IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： Zichu Qi Hui Liu Xiangku Li Jun Xu Weiwu Hu Chinese Academy of Sciences Beijing Beijing CN Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China

ISBN: (纸本)9781424450909;9781424450916

For a gigahertz microprocessor with multiple clock domains and a large amount of embedded RAMs (random access memory), generating at-speed testing patterns is becoming very difficult and very time-consuming. This paper presents some novel techniques to improve at-speed testing coverage with low cost. These methods are major concern about preventing X states propagation, which include avoiding capturing X states for registers, sequential bypass of macros, clock control scheme for inter-clock domains and accurate analysis of exception paths in intra-clock domains. Functional patterns are utilized to further improve the efficiency of the at-speed testing. A novel optimal flow is presented by carefully selecting these techniques. By using the flow, 90% transition fault coverage is achieved. In addition, both the number of patterns and the test time of the transition test are decreased by 15%. The total area overhead is about a few hundreds of AND cells and has little timing impact on the critical paths.

关键词： Microprocessors Clocks Test pattern generators system testing Costs Timing Automatic test pattern generation Delay Pattern analysis Laboratories

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Data Management: The Spirit to Pursuit Peak Performance on Many-Core Processor

Data Management: The Spirit to Pursuit Peak Performance on M...

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International Symposium on Parallel and Distributed Processing with Applications, ISPA

作者： Yongbin Zhou Junchao Zhang Shuai Zhang Nan Yuan Dongrui Fan Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China Chinese Academy of Sciences Beijing Beijing CN

To date, most of many-core prototypes employ tiled topologies connected through on-chip networks. The throughput and latency of the on-chip networks usually become to the bottleneck to achieve peak performance especially for communication intensive applications. Most of studies are focus on on-chip networks only, such as routing algorithms or router micro-architecture, to improve the above metrics. The salient aspect of our approach is that we provide a data management framework to implement high efficient on-chip traffic based on overall many-core system. The major contributions of this paper include that: (1) providing a novel tiled many-core architecture which supports software controlled on-chip data storage and movement management; (2) identifying that the asynchronous bulk data transfer mechanism is an effective method to tolerant the latency of 2-D mesh on-chip networks. At last, we evaluate the 1-D FFT algorithm on the framework and the performance achieves 47.6 Gflops with 24.8% computation efficiency.

关键词： Network-on-a-chip Delay Prototypes Network topology Throughput Routing system-on-a-chip Communication system traffic control computer architecture Memory

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A stochastic method for controlling the scaling parameters of Cauchy mutation in fast evolutionary programming

A stochastic method for controlling the scaling parameters o...

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Congress on Evolutionary Computation

作者： Yunji Chen Ke Tang Tianshi Chen Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Nature Inspired Computation and Applications Laboratory Department of Computer Science and Technology University of Science and Technology of China Hefei Anhui China

The fast evolutionary programming (FEP) introduced the Cauchy distribution into its mutation operator, thus the performances of EP were promoted significantly on a number of benchmark problems. However, the scaling parameter of the Cauchy mutation is invariable, which has become an obstacle for FEP to reach better performance. This paper proposes and analyzes a new stochastic method for controlling the variable scaling parameters of Cauchy mutation. This stochastic method collects information from a group of individuals randomly selected from the population. Empirical evidence validates our method to be very helpful in promoting the performance of FEP.

关键词： Stochastic processes Genetic mutations Genetic programming Laboratories Random variables Gaussian distribution Control systems Stochastic systems computer architecture computer applications

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architecture Level Energy Modeling and Optimization for Multi-Ported Giga-Hz Physical Register File

Architecture Level Energy Modeling and Optimization for Mult...

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International Conference on Networking, architecture, and Storage (NAS)

作者： Ge Zhang Xu Yang Yiwei Zhang Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China Department of Information and Technology University of International Relations UIR Beijing China

In modern high performance microprocessors, multi-ported register-files are commonly used and critical in both performance and energy consumption. As capability and issue width of register-file grows, its energy consumption increases rapidly. Much prior work about energy-efficient register-file design is focusing on various low levels except for architecture level. In this paper, an accurate architectural level energy model for register-file is proposed and verified, based on which some efficient and practical improvements are presented to save energy without changing the internal circuits or structure of register-file. We implemented a full-customized 64-bit width 64-entry depth physical register-file with 8 read ports and 4 write ports, whose power is as low as 20 mW, in a 1 GHz 4-issue out-of-order 64-bit MIPS microprocessor, Godson-2 [1], using 90 nm CMOS process. 56.0% of reading energy and 20.3% of writing energy can be saved.

关键词： Circuits computer architecture Energy consumption Microprocessors Registers Energy efficiency Out of order CMOS process Writing Semiconductor device modeling

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Detecting and Eliminating Potential Violations of Sequential Consistency for Concurrent C/C++ Programs 09

Detecting and Eliminating Potential Violations of Sequential...

引用

International Symposium on Code Generation and Optimization (CGO)

作者： Yuelu Duan Xiaobing Feng Lei Wang Chao Zhang Pen-Chung Yew Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China Department of Computer Science and Engineering University of Minnesota Twin-Cities Minneapolis USA

ISBN: (纸本)9780769535760

When a concurrent shared-memory program written with a sequential consistency (SC) model is run on a machine implemented with a relaxed consistency (RC) model, it could cause SC violations that are very hard to debug. To avoid such violations, programmers need to provide explicit synchronizations or insert fence instructions. In this paper, we propose a scheme to detect and eliminate potential SC violations by combining Shasha/Snir's conflict graph and delay set theory with existing data race detection techniques. For each execution, we generate a race graph, which contains the improperly synchronized conflict accesses, called race accesses, and race cycles formed with those accesses. As a race cycle would probably lead to a non-sequential-consistent execution, we call it a potential violation of sequential consistency (PVSC) bug. We then compute the race delays of race cycles, and suggest programmers to insert fences into source code to eliminate PVSC bugs. We further convert a race graph into a PC race graph, and improves cycle detection and race delay computation to O(n 2 ), where n is the number of race access instructions. We evaluate our approach with the SPLASH-2 benchmarks, two large real-world applications (MySQL and Apache), and several multi-threaded Cilk programs. The results show that (1) the proposed approach could effec-tively detect PVSC bugs in real-world applications with good scalability; (2) it retains most of the performance of the concurrent program after inserting required fence instructions, with less than 6.3% performance loss; and (3) the additional cost of our approach over traditional race detection techniques is quite low, with 3.3% on average.

关键词： Programming profession Delay Set theory computer bugs Performance loss Chaos computer science Laboratories Concurrent computing computer architecture

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Extended Selective Encoding of Scan Slices for Reducing Test Data and Test Power

Extended Selective Encoding of Scan Slices for Reducing Test...

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Asian Test Symposium (ATS)

作者： Jun Liu Yinhe Han Xiaowei Li School of Computer and Information Hefei University of Technology Hefei China Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China

Recently, selective encoding of scan slices is proposed to compress test data. This encoding technique, unlike many other compression techniques encoding all the bits, only encodes the target-symbol by specifying single bit index and copying group data. In this paper, we propose an extended selective encoding which presents two new techniques: flexible grouping strategy, X bits exploitation and filling strategy. Flexible grouping strategy is able to decrease the number of encoded groups to improve compression ratio. X bits exploitation and filling strategy can exploit a large number of don't care bits to reduce testing power with no compression ratio loss. Experimental results show that the proposed technique needs less test data storage volume and reduces average weighted switching activity by 24.7%, peak weighted switching activity by 11.6% during scan shift compared to selective encoding.

关键词： Encoding Circuit testing Memory Test data compression Filling Laboratories computer architecture Merging Hardware system testing

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A Model Analyzing Method for OWL-S Services Composition Based on High Level Petri Net

A Model Analyzing Method for OWL-S Services Composition Base...

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International Symposium on Knowledge Acquisition and Modeling, KAM

作者： Shaoran Dong Zengzhi Li State key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Institute of Computer System Architecture and Network Xi''an Jiaotong University Xi'an China

To analyze model of Web services composition, firstly analyze and abstract dataflow and control construct in OWL-S process to build high level Petri net model, then describe Petri net in Poses++ language, at last simulate Petri net with Poses++ to check data type and deadlock and calculate service performance. The experiment shows that this model analyzing method is able to accomplish type checking and deadlock and performance analyzing.

关键词： Performance analysis Web services system recovery Data analysis Petri nets Ontologies OWL Analytical models Knowledge acquisition computer networks

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