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21st IEEE International Conference on High Performance Computing and Communications, 17th IEEE International Conference on Smart City and 5th IEEE International Conference on Data Science and systems, HPCC/SmartCity/DSS 2019

作者： An, Shuqian Zhang, Mingzhe Ye, Xiaochun Wang, Da Zhang, Hao Fan, Dongrui Tang, Zhimin University of Chinese Academy of Sciences Beijing China State Key Laboratory of Computer Architecture ICT CAS Beijing China

ISBN: (纸本)9781728120584

The Coarse-Grained Reconfigurable architecture (CGRA) is considered as one of the most potential candidates for big data applications, which provides significant throughput improvement and high energy efficiency. Unlike the dynamic issue superscalar method in conventional processors, the CGRA architecture uses the static placement dynamic issue (SPDI) execution method in which the compiler decides how to map the instructions onto the distributed processing elements (PEs) and the PEs executes one instruction when the required data is ready. Since the dataflow of the program is determined in the logical view, an improper mapping of instructions may leads to more network congestion and hurts the performance. Furthermore, the exploration for most optimized mapping in CGRA is proved to a NPC problem and can hardly be achieved in limited time. In this paper, we propose a novel mapping algorithm named Congestion-MAP (C-MAP). C-Map improves the effectiveness of CGRA mapping in the perspective of reducing network congestion and enhancing the continuity of the data-flow. Furthermore, C-Map also accelerates the mapping optimization for CGRA by using network analysis method, which supports the fast comparison of mapping plan and parallel exploration. Additionally, with C-Map, we also analyze the impact of several key considerations in CGRA instruction mapping, such as NoC workload reduction and workload balance. The experiment result shows that C-Map improves the performance by 2.2× as a geometric mean. © 2019 IEEE.

关键词： Network-on-chip

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Distributed H∞-Consensus Estimation for Moving Target using Constant Gain 34

Distributed H∞-Consensus Estimation for Moving Target using...

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第三十四届中国控制会议

作者： HU Chen HE Bing MA Xi LIU Gang Department of Automation Xian Institute of High-Tech State Key Laboratory of Intelligence Technology and System Department of Computer Science and Technology Tsinghua University

ISBN: (纸本)9781467374439

This paper studies the H∞-consensus estimation problem for a moving target using constant gain under local communication and stochastic noises, where the communication topology is assumed to be switched. To solve this problem, we propose a recursive H∞-consensus estimation algorithm using constant gain, which based on the solution of algebraic Riccati equation（ARE）. The stability properties of the proposed algorithm and a lower bound for estimation errors are investigated by using Lyapunov method and a common H∞ filter. The effectiveness of the proposed estimation algorithm are illustrated by simulations.

关键词： Multi-agent systems distributed estimation H∞ filter switching topology

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A unified approach to chaos suppressing and inducing in a periodically forced family of nonlinear oscillators

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IEEE Transactions on Circuits and systems I: Regular Papers 2012年第4期59卷 784-795页

作者： Li, Huaqing Liao, Xiaofeng Liao, Ruijin State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Computer Science Chongqing University Chongqing 400044 China

This paper finds and investigates the application of single-exponential local decay pulse (SELDP) to suppress and induce chaos in a family of nonlinear oscillators subject to weak damping and external periodic excitations. Fourier series of SELDP defined on a period is derived and the approximate series is extended to that defined on the set of whole positive real numbers. To show the feasibility of the obtained results, we first give an effective design scheme of electrical circuit related to SELDP signal and this may be helpful in future implementations. We concentrate on this case in which the unforced system possesses two homoclinic orbits. In order to apply Melnikov's approach to make the underlying parameter conditions for suppressing and inducing chaos more clear, a generic numerical algorithm is proposed to compute complicated Melnikov functions. Two propositions, serving as designing the correct parameters in the SELDP function are also given. From our study, we find that chaos can be induced (suppressed) according to the corresponding Melnikov functions have (do not have) simple zeros. Our work can help to understand the underlying mechanisms of suppressing and inducing chaos. The simulation results show the effectiveness of our proposed approach. © 2004-2012 IEEE.

关键词： Chaos inducing chaos suppressing Melnikov's approach nonlinear driven oscillators periodic parameter perturbations single-exponential local decay pulse (SELDP)

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Optimizing web browser on many-core architectures

Optimizing web browser on many-core architectures

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2011 12th International Conference on Parallel and Distributed Computing, Applications and Technologies, PDCAT 2011

作者： Fan, Lingjun Shi, Weisong Tang, Shibin Yan, Chenggang Fan, Dongrui Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Academy of Sciences Graduate University Beijing China Department of Computer Science Wayne State University Detroit United States

ISBN: (纸本)9780769545646

As more and more Web applications emerging on sever end today, the Web browser on client end has become a host of a variety of applications other than just rendering static Web pages. This leads to more and more performance requirements of a Web browser, for which user experience is very important. This situation may become more urgency when on handheld devices. Some efforts like redesign a new Web browser have been made to overcome this problem. In this paper, we address this issue by optimizing the main processes of the Web browser on a state-of-the-art 64-core architecture, Godson-T, which was developed at Chinese Academy of Sciences, as multi-/many-core architecture to be the mainstream processor in the upcoming years. We start a new core to process a new tab when facing up to intensive URL requests, and we use scratch-pad memory (SPM) of each core as a local buffer to store the HTML source data to be processed to reduce off-chip memory access and exploit more data locality, otherwise, we use DTA to transfer HTML data for backup. Experiments conducted on the cycle-accurate simulator show that, starting each tab process by a new core could obtain 5.7% to 50% speedup with different number of cores used to process corresponding URL requests, with onchip scratchpad memory of each core used to store the HTML data, more speedup could be achieved when number of cores increase. Also, as Data Transfer Agent (DTA) used to transfer the HTML data, the backup of HTML data can get 2X to 5X speedups according to different data amount. © 2011 IEEE.

关键词： Data transfer

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A mutation-based fault injection method for C program

A mutation-based fault injection method for C program

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International Conference on Multimedia, Communication and Computing Application, MCCA 2014

作者： Song, H. Wang, Y.W. Qian, G.N. Gong, Y.Z. Wang, Y.W. State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences China

ISBN: (纸本)9781138027756

Fault injection plays a critical role in the verification of software’s reliability. This paper presents a fault injection method by mutation. Moreover, a strategy of using semantic-based mutators is proposed to improve the efficiency of mutation testing. We implemented the method in FIT, an automatic fault injection tool. Experiments prove that the method is effective and the tool can produce lots of mutants which show that mutation testing is satisfying. © 2015 Taylor & Francis Group, London.

关键词： Semantics

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A method of stub generation for I/O functions in automatic test

A method of stub generation for I/O functions in automatic t...

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International Conference on Multimedia, Communication and Computing Application, MCCA 2014

作者： Yang, Y.W. Wang, Y.W. Gong, Y.Z. Wang, Y.W. State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences China

ISBN: (纸本)9781138027756

Library functions and system calls have been major difficulties faced by automatic test. Input/ output (I/O) functions are a set of common library functions. Testers have to interact with the test procedures if the test program contains I/O functions, resulting in inefficient automatic test. Unlike normal functions, the association between I/O functions and operating on a specific I/O device makes ordinary stub method disabled. Aiming at solving this problem, this paper proposes one solution by I/O device modeling and I/O function modeling. The semantics of the I/O functions are stored in the I/O function model, and the operations of I/O functions are similar to the I/O device model. The final state and properties of the I/O device are represented by two models. Finally the stub code is automatically generated by path-oriented stub generation technology. Experiments show that this method is effective. © 2015 Taylor & Francis Group, London.

关键词： Semantics

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Laser 728 nm Spectroscopy of Electrodeless Discharge Rb Lamp

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Chinese Physics Letters 2014年第12期31卷 23-26页

作者：刘忠征薛潇博牛富增张理国凌俐陈景标 State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum Electronics School of Electronics Engineering ~ Computer Science Peking University Beijing 100871 Institute of Information and Electronics Zhejiang University City College Hangzhou 310015

The electrodeless discharge rubidium vapor lamp plays a key role in a number of applications, such as atomic clock, atomic magnetometer, atomic optical filter and laser frequency stabilization. The electrodeless discharge Rb vapor lamp has rich spectra, including 420nm, 421nm, 565nm, 572nm, 607nm, 616nm, 728 nm, 776 nm, 780 nm, 795 nm, 1324 nm, 1344 nm, 1366 nm, 1475 nm, 1529 nm spectroscopy, etc. The 780nm transition wavelength between 5P3/2 and 5S1/2 of Rb atoms is usually used in fields of the Rb atomic clock and the Rb atomic *** the 421.7 nm laser pumping atoms from 5S1/2 to 6P1/2, 1366.9 nm transition from 6S1/2 to 5P3/2 can be used as a clock transition of Rb four levels for an atomic active optical clock. An active optical clock is a new conception of the atomic clock and has the potential to improve the stabil- ity of the best atomic clocks by about two orders of magnitude. Another application of the elec- trodeless discharge Rb vapor lamp is the Rb Faraday anomalous-dispersion optical filter （FADOF）（e.g., 776 nm] and 1529 nm spectroscopy）, in which the electrodeless discharge Rb vapor lamp is more feasible than the one using a laser pumped Rb vapor cell in some cases, since many excited states are populated enough for aimed FADOF transition. Although the rich spectra of Rb have many applications, so far no detailed investigations or applications have been achieved in 728.0nm transition. To the best of our knowledge, the Rb 728.0 nm spectral data are currently only from the fluorescence by Beacham arc spectrum of rubidium early in 1959.

关键词： LASER spectroscopy INDUCTION lamps RUBIDIUM ABSORPTION spectra LASER cooling PHASE transformations (Physics)

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Hierarchical adaptive cross-coupled control of traffic signals and vehicle routes in large-scale road network

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computer-Aided Civil and Infrastructure Engineering 2025年

作者： Chang, Yizhuo Ren, Yilong Jiang, Han Fu, Daocheng Cai, Pinlong Cui, Zhiyong Li, Aoyong Yu, Haiyang State Key Laboratory of Intelligent Transportation System Beihang University Beijing China School of Transportation Science and Engineering Beihang University Beijing China Zhongguancun Laboratory Beijing China Hangzhou Innovation Institute Beihang University Hangzhou China Shanghai Artificial Intelligence Laboratory Shanghai China School of Computer Science Fudan University Shanghai China

Traffic signal timing and vehicle routing have been empirically demonstrated as the two most promising paradigms for network-level urban road traffic management. However, mainstream studies based on Wardrop's theory continues to treat these two modules separately without achieving effective coupling. Optimization-based methods face the challenge of increasing computational complexity as urban scales continue to expand, constrained to small-scale road networks. To address the above challenges, this paper proposes HAC3, a hierarchical adaptive cross-coupled control method for network-wide traffic management. HAC3 utilizes a rolling horizon architecture, comprising a fast update stage and a slow update stage. The core of the slow update stage is a spatiotemporal superposition vehicle route planning (SSP) module, which assigns the optimal route to each connected vehicle (CV) based on the road network state and the traffic signal timing of each intersection, and clarifies priority in right-of-way allocation to avoid falling into local optimal. The fast update stage is used for multi-intersection adaptive traffic signal control (TSC), taking the intersection state and vehicle routes as inputs to optimize the signal timing scheme. Through the asynchronous cross-coupling optimization of the two stages, the road network efficiency can be improved while ensuring equilibrium. Experimental results show that HAC3 achieves superior convergence performance on both synthetic and real-world road network data sets, outperforming baseline methods and proving its scalability to large-scale road networks. Plug-and-play experiments indicate the proposed HAC3 framework can integrate with other mainstream signal control models. © 2025 computer-Aided Civil and Infrastructure Engineering.

关键词： Vehicle routing

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Labeled Network Stack: A High-Concurrency and Low-Tail Latency Cloud Server Framework for Massive IoT Devices

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Journal of computer Science & Technology 2020年第1期35卷 179-193页

作者： Wen-Li Zhang Ke Liu Yi-Fan Shen Ya-Zhu Lan Hui Song Ming-Yu Chen Yuan-Fei Chen State Key Laboratory of Computer Architecture Institute of Computing TechnologyChinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China Peng Cheng Laboratory Shenzhen 518000China Zhongke Zhicheng Electronic Technology Company Limited Jining 272000China

Internet of Things(IoT)applications have massive client connections to cloud servers,and the number of networked IoT devices is remarkably *** services require both low-tail latency and high concurrency in *** study aims to determine whether an order of magnitude improvement is possible in tail latency and concurrency in mainstream systems by proposing a hardware-software codesigned labeled network stack(LNS)for future *** key innovation is a cross-layered payload labeling mechanism that distinguishes different requests by payload across the full network stack,including application,TCP/IP,and Ethernet *** type of design enables prioritized data packet processing and forwarding along the full datapath,such that latency-insensitive requests cannot significantly interfere with high-priority *** build a prototype datacenter server to evaluate the LNS design against a commercial X86 server and the mTCP research,using a cloud-supported IoT application *** results show that the LNS design can provide an order of magnitude improvement in tail latency and concurrency.A single datacenter server node can support over 2 million concurrent long-living connections for IoT devices as a 99-percentile tail latency of 50 ms is *** addition,the hardware-software codesign approach remarkably reduces the labeling and prioritization overhead and constrains the interference of high-priority requests to low-priority requests.

关键词： tail latency high concurrency network stack cloud server Internet of Things(IoT)service

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Low power cache architectures with hybrid approach of filtering unnecessary way accesses

Low power cache architectures with hybrid approach of filter...

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2013 International Workshop on Programming Models and Applications for Multicores and Manycores, PMAM 2013

作者： Fan, Lingjun Wang, Shinan Zheng, Yasong Shi, Weisong Fan, Dongrui State Key Laboratory of Computer Architecture ICT CAS Beijing 100190 China Department of Computer Science Wayne State University Detroit MI 48202 United States

ISBN: (纸本)9781450319089

Power has been a big issue in processor design for several years. As caches account for more and more CPU die area and power, this paper presents using filtering unnecessary way accesses to reduce dynamic power consumption of unified L2 cache shared by instruction and data. Our methods include using Invalid Filter, which could eliminate accesses to cache ways contained invalid blocks, and I/D Filter, which could eliminate accesses to cache ways contained instruction/data access type mismatch blocks, and Tag-2 Filter, which could eliminate accesses to cache ways contained tag lowest 2 bits mismatch blocks. Since the methods reducing the activities happened in cache architecture, dynamical CPU power could be significantly decreased. In the paper, we also propose combining the above methods together(Invalid+I/D+Tag-2 Filter), which is called Way-Filtering Cache, in an attempt to achieve better power saving results. Our evaluations show that, we could obtain 19.6%-47.8% (which is on average 34.3%)improvement on a 64K-4way cache and 19.6%-55.2%(which is on average 39.2%) improvement on a 128k-8way cache comparing to Invalid+I/D Filter, and 6.1%-27.7%(which is on average 16.6%) improvement on a 64K-4way cache and 6.9%-44.4%(which is on average 25.0%) improvement on a 128k-8way cache comparing to Invalid+Tag-2 Filter, respectively. Also, comparing to Tag-Data caches, which is popular used in less-latency-sensitive caches(e.g. unified L2 or Shared Last-LevelCache), our Way-Filtering cache could get 18.3%-29.2%(which is on average 23.1%) improvement on 64K-4way cache, and 27.2% to 50.1%(which is on average 41.1%) improvement on 128K-8way cache. © 2013 ACM.

关键词： Bandpass filters

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