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Tien Tzu Hsueh Pao/Acta Electronica Sinica 2008年第10期36卷 1955-1960页

作者： Zou, Qiong Zhang, Long-Bing Department of Computer Science and Technology University of Science and Technology of China Hefei 230027 China Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

Allocation order is the best for locality, which slide mark compact algorithm is based on. But traditional design made the algorithm's overhead too large. We proposed a fast slide mark compact algorithm, which reduces the overhead by mark bit table, live block pool and offset table. The results show that it achieves up to 8.9% speedup in industry-standard benchmark SPEC JVM98 on the Pentium 4, 11% improvement in dtlb miss numbers and 13.6% reduce with L2 cache miss numbers.

关键词： Garbage collection Live block pool Mark bit table Mark compact Offset table

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Capacity-shared heterogeneous CMP cache

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Jisuanji Yanjiu yu Fazhan/computer Research and Development 2008年第5期45卷 877-885页

作者： Gao, Xiang Zhang, Longbing Hu, Weiwu Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Department of Computer Science and Technology University of Science and Technology of China Hefei 230027 China

The characteristics of advanced integrated circuit technologies require architects to look for new ways to utilize large numbers of gates and mitigate the effects of high interconnect delays. Chip multiprocessors (CMPs) exploit increasing transistor counts by placing multiple processors on a single die. As the chip multiprocessors (CMPs) have become the trend of high performance microprocessors, the target workloads become more and more diversified. Due to the wire delay problem and diversity of applications, neither private nor shared caches can provide both large capacity and fast access in CMPs. A novel CMP cache design, the heterogeneous CMP cache (HCC) is presented, in which chips are constructed by tiles of two different categories. L2 caches of private tiles provide lowest hit latency and L2 cache of shared tiles increases the effective cache capacity for shared data. Incorporating indirect-index cache technology to share capacity between different hierarchies, HCC provide a both capacity-effective and access-fast on-chip memory subsystem. Detailed full-system simulations are used to analyze the HCC performance for various programs, including SPEC CPU2000, SPLASH2 and commercial workloads. The result shows that HCC improves performance by 16% for single-threaded benchmarks and 9% for multi-thread benchmarks. HCC is easy to implement and the design ideas will be used in the future multi-core processors of Godson series.

关键词： Microprocessor chips

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Improved structural modeling based on conserved domain clusters and structure-anchored alignments

Proceedings of the ACM Symposium on Applied Computing

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Proceedings of the ACM Symposium on Applied Computing 2007年 128-132页

作者： Zhang, Fa Xu, Lin Liu, Zhiyong Yuan, Bo Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Science Graduate School Chinese Academy of Science Institute of Computing Technology Chinese Academy of Science Department of Computer Science and Engineering Shanghai Jiaotong University

ISBN: (纸本)1595934804;9781595934802

In this paper, we presented a method to improve structural modeling based on conserved domain clusters and structure-anchored alignments. We first constructed a template library of structural clusters for all conserved sequence domains. Then, for each cluster, we built the profile using the structure and sequence information. Finally we use the profile and structural alignments as anchors to increase the alignment accuracy between a query and its templates. Our preliminary results show that this method can be used for the partial prediction for a majority of known protein sequences with better qualities. Copyright 2007 ACM.

关键词： Proteins

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Reliable and Energy Efficient Protocol for Wireless Sensor Network

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Tsinghua science and Technology 2007年第S1期12卷 95-100页

作者：阚保强蔡理徐勇军 College of Science Air Force Engineering University Key Laboratory of Computer System and Architecture Institute of Computing TechnologyChinese Academy of Sciences

Low-power design is one of the most important issues in wireless sensor networks (WSNs) , while reliable information transmitting should be ensured as well. Transmitting power (TP) control is a simple method to make the power consumption down, but excessive interferences from potential adjacent operating links and communication reliability between nodes should be considered. In this paper, a reliable and energy efficient protocol is presented, which adopts adaptive rate control based on an optimal TP. A mathematical model considering average interference and network connectivity was used to predict the optimal TP. Then for the optimal TP, active nodes adaptively chose the data rate with the change of bit-error–rate(BER) performance. The efficiency of the new strategy was validated by mathematical analysis and simulations. Compared with 802.11 DCF which uses maximum unified TP and BASIC protocol, it is shown that the higher average throughput can achieve while the energy consumption per useful bit can be reduced according to the results.

关键词： wireless sensor networks reliable communication energy efficient optimal transmitting power adaptive link control

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Differential evolution for multiobjective optimization with self adaptation

Differential evolution for multiobjective optimization with ...

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Congress on Evolutionary Computation

作者： Ales Zamuda Janez Brest Borko Boskovic Viljem Zumer Computer Architecture and Languages Laboratory Institute of Computer Science Faculty of Electrical Engineering and Computer Science University of Maribor Maribor Slovenia

This paper presents performance assessment of differential evolution for multiobjective optimization with self adaptation algorithm, which uses the self adaptation mechanism from evolution strategies to adapt F and CR parameters of the candidate creation in DE. Results for several runs on CEC2007 special session test functions are presented and assessed with different performance metrics. Based on these metrics, algorithm strengths and weaknesses are discussed.

关键词： Chromium Measurement Evolutionary computation Genetic mutations computer science Automatic testing Simulated annealing Performance evaluation computer architecture Ground penetrating radar

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Performance Evaluation of Multiple TCP connections in iSCSI

Performance Evaluation of Multiple TCP connections in iSCSI

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IEEE/NASA Goddard Conference on Mass Storage Systems and Technologies, (MSST)

作者： Bhargava K. Kancherla Ganesh M. Narayan K. Gopinath Computer Architecture and Systems Laboratory Department of Computer Science and Automation Indian Institute of Science Bangalore India

Storage area networks (SANs) based on fibre channel have been used extensively in the last decade while iSCSI is fast becoming a serious contender due to its reduced costs and unified infrastructure. This work examines the performance of iSCSI with multiple TCP connections. Multiple TCP connections are often used to realize higher bandwidth but there may be no fairness in how bandwidth is distributed. We propose a mechanism to share congestion information across multiple flows in "Fair-TCP" for improved performance. Our results show that Fair-TCP significantly improves the performance for I/O intensive workloads.

关键词： Throughput TCPIP Wide area networks Storage area networks Encapsulation Storage automation Bandwidth Transport protocols Optical fiber cables computer architecture

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Why Toys Shouldn't Work "Like Magic": Children's Technology and the Values of Construction and Control

Why Toys Shouldn't Work "Like Magic": Children's Technology ...

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IEEE International Workshop on Digital Game and Intelligent Toy Enhanced Learning (DIGITEL)

作者： Mark D. Gross Michael Eisenberg Computational Design Laboratory School of Architecture Carnegie Mellon University USA Institute of Cognitive Science and Department of Computer Science University of Colorado Boulder USA

The design and engineering of children's artifacts-like engineering in general - exhibits a recurring philosophical tension between what might be called an emphasis on "ease of use" on the one hand, and an emphasis on "user empowerment" on the other. This paper argues for a style of technological toy design that emphasizes construction, mastery, and personal expressiveness for children, and that consequently runs counter to the (arguably ascendant) tradition of toys that work "like magic". We describe a series of working prototypes from our laboratories - examples that illustrate new technologies in the service of children's construction - and we use these examples to ground a wider-ranging discussion of toy design and potential future work.

关键词： Switches Design engineering Laboratories Prototypes computer architecture Counting circuits Cognitive science computer science TV Watches

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Reliable and Energy Efficient Protocol for Wireless Sensor Network

Reliable and Energy Efficient Protocol for Wireless Sensor N...

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第十二届全国容错计算学术会议

作者： KAN Baoqiang CAI Li XU Yongjun College of Science Air Force Engineering UniversityXi'an 710052China Key Laboratory of Computer Sy College of Science Air Force Engineering UniversityXi'an 710052China Key Laboratory of Computer System and Architecture Institute of Computing TechnologyChinese Academy

Low-power design is one of the most important issues in wireless sensor networks (WSNs), while reliable information transmitting should be ensured as well. Transmitting power (TP) control is a simple method to make the power consumption down, but excessive interferences from potential adjacent operating links and communication reliability between nodes should be considered. In this paper, a reliable and energy efficient protocol is presented, which adopts adaptive rate control based on an optimal TP. A mathematical model considering average interference and network connectivity was used to predict the optimal TP. Then for the optimal TP, active nodes adaptively chose the data rate with the change of bit-error-rate(BER) performance. The efficiency of the new strategy was validated by mathematical analysis and simulations. Compared with 802.11 DCF which uses maximum unified TP and BASIC protocol, it is shown that the higher average throughput can achieve while the energy consumption per useful bit can be reduced according to the results.

关键词： wireless sensor networks reliable communication energy efficient optimal transmitting power adaptive link control

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Data access and management in ACGT: tools to solve syntactic and semantic heterogeneities between clinical and image databases 07

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Proceedings of the 2007 conference on Advances in conceptual modeling: foundations and applications

作者： Luis Martín Erwin Bonsma Alberto Anguita Jeroen Vrijnsen Miguel García-Remesal José Crespo Manolis Tsiknakis Víctor Maojo Biomedical Informatics Group Artificial Intelligence Laboratory School of Computer Science Universidad Politécnica de Madrid Boadilla del Monte Madrid Spain Phillips Research Healthcare System Architecture Eindhoven The Netherlands Center of eHealth Technologies Institute of Computer Science Foundation for Research and Technology-Hellas Heraklion Crete Greece

ISBN: (纸本)9783540762911

Recent changes in data management within post-genomic clinical trials have emphasized the need for novel methods and tools to solve semantic and syntactic heterogeneities among distributed sources of information. ACGT is an Integrated Project funded by the European Commission that aims at building a GRID-based platform comprised by a set of tools to support multicentric post-genomic clinical trials on cancer. The main goal of ACGT is to provide seamless access to heterogeneous sources of information. For this purpose, two core tools were developed and included in the ACGT architecture: the ACGT Semantic Mediator (ACGT-SM), and the Data Access Wrappers (ACGT-DAWs). The ACGT-SM addresses semantics and schema integration, while the ACGT-DAWs cope with syntactic heterogeneities. Once the sources are bridged together, they can be seamlessly accessed using the RDQL query *** tested our tools using a set of three relational and DICOM based image sources obtaining promising results.

关键词： DICOM ontologies semantic mediation database integration clinical trial databases

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SAT-based arithmetic circuit bug-hunting method

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Jisuanji Xuebao/Chinese Journal of computers 2007年第12期30卷 2082-2089页

作者： Chen, Yun-Ji Zhang, Jian H.-H., Shen W.-W., Hu Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 China

E-CNF is hybrid of Boolean formula and mathematic formula. SAT-based arithmetic circuit bug-hunting method translates the verification problem into E-CNF, and solves E-CNF through E-SAT solver, E-SAT solver is an extension of complete SAT solver, with tag clause technique. Experiments show that SAT-based arithmetic bug-hunting method is powerful in finding bugs in arithmetic circuits.

关键词： Verification

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