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Performance-Centric Optimization for Racetrack Memory Based Register File on GPUs

Journal of Computer Science & Technology 2016年第1期31卷 36-49页

作者： yun liang Shuo Wang Center for Energy-Efficient Computing and Applications ( CECA) School of Electrical Engineering and Computer Sciences Peking University Beijing 100871 China

The key to high performance for GPU architecture lies in its massive threading capability to drive a large number of cores and enable execution overlapping among threads. However, in reality, the number of threads that can simultaneously execute is often limited by the size of the register file on GPUs. The traditional SRAM-based register file takes up so large amount of chip area that it cannot scale to meet the increasing demand of GPU applications. Racetrack memory （RM） is a promising technology for designing large capacity register file on GPUs due to its high data storage density. However, without careful deployment of RM-based register file, the lengthy shift operations of RM may hurt the performance. In this paper, we explore RM for designing high-performance register file for GPU architecture. High storage density RM helps to improve the thread level parallelism （TLP）, but if the bits of the registers are not aligned to the ports, shift operations are required to move the bits to the access ports before they are accessed, and thus the read/write operations are delayed. We develop an optimization framework for RM-based register file on GPUs, which employs three different optimization techniques at the application, compilation, and architecture level, respectively. More clearly, we optimize the TLP at the application level, design a register mapping algorithm at the compilation level, and design a preshifting mechanism at the architecture level. Collectively, these optimizations help to determine the TLP without causing cache and register file resource contention and reduce the shift operation overhead. Experimental results using a variety of representative workloads demonstrate that our optimization framework achieves up to 29% （21% on average） performance improvement.

关键词： register file racetrack memory GPU

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Long Bialgebras,Dimodule Algebras and Quantum Yang-Baxter Modules over Long Bialgebras

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Acta Mathematica Sinica,English Series 2006年第4期22卷 1261-1270页

作者： liang yun ZHANG College of Science Nanjing Agricultural University Nanjing 210095 P. R. China Department of Mathematics Nanjing University Nanjing 210008 P. R. China

This paper gives a sufficient and necessary condition for a bialgebra to be a Long bialgebra, and proves a braided product to be a Long bialgebra under some conditions. It also gives a direct sum decomposition of quan... 详细信息

关键词： Long bialgebra dimodule algebra braided product quantum Yang-Baxter module

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Nonlinear dynamic analysis of the Three Gorge Project powerhouse excited by pressure fluctuation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第9期10卷 1231-1240页

作者： Cun-hui ZHANG yun-liang ZHANG School of Civil and Hydraulic Engineering Dalian University of Technology Dalian 116024 China

This study established a 3D finite element model for 15# hydropower house of the Three Gorges Project (TGP) and performed a nonlinear dynamic analysis under pressure fluctuation. In this numerical model, the stiffness degradation in tension for concrete was considered on the basis of the continuum isotropic damage theory. Natural vibration frequencies of the damaged and undamaged structures were compared after static water pressure was applied. Then a study was further conducted on forced vibration of the powerhouse with pre-existing damages under pressure fluctuation that acts on the flow passage; displacement, velocity and acceleration of the important structural members were afterwards presented and checked. Numerical results show that tensile damages in concrete surrounding the spiral case only exert significant impact upon the dynamic characteristics of substructure but show little effect on the superstructure. Nevertheless vibrations of the powerhouse are still under the recommended vibration limits.

关键词： Three Gorges Project (TGP) Hydropower house Dynamic Nonlinear Damage Pressure fluctuation

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Properties and Applications of the Eccentric-gear Drive

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Chinese Journal of Mechanical Engineering 2011年第2期24卷 323-331页

作者： ZHAO yun SUN liang YU Gaohong College of Mechanical Engineering and Automation Zhejiang Sci-Tech UniversiO Hangzhou 310018 China

The eccentric-gear can be used for variable speed ***,due to the vibrations caused by variation of backlash in working process,the eccentric-gear is seldom applied in engineering *** is just a little study about the *** it is necessary to take a further research on eccentric-gear transmission for the applications in the transplanting mechanism of high-speed rice *** key of this paper is to extend understanding of three following characteristics of this drive：（1） The rotation-center-distance and the geometrical-center-distance of the two meshing eccentric gears are respectively the hypotenuse and the straight edge of a right triangle in a cycle.（2） The geometrical center line of two meshing gears divides the linking-line of the two rotational centers equally.（3） When two times the eccentricity of gear,the rotation-center-distance and the geometrical-center-distance form a right triangle,the optimal value of rotation-center-distance can be *** addition,the kinematic analysis,such as the relationship between contact point and midpoint of the linking-line of two gears＇ rotational centers,transmission ratio between the driving-gear and the driven-gear,contact angle and coordinate of contact point are be made,further the formula for calculation of contact force,flow chart for writing optimization program and curve for analysis of data are also be *** relationship between the rotation-center-distance and the geometrical-center-distance,which is determined by three characteristics mentioned above, is a key for the rational design and application of eccentric-gear ***,the presented right triangle property of eccentric gear drive is an important reference for effective analysis of dynamic characteristic of eccentric-gear mechanism and its reliable design.

关键词： eccentric gear transmission property variable speed transmission kinematic and dynamic analysis

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The Frattini p-subsystem of a Solvable Restricted Lie Triple System

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Acta Mathematica Sinica,English Series 2010年第10期26卷 1887-1898页

作者： liang yun CHEN Dong LIU School of Mathematics and Statistics Northeast Normal University Changchun 130024 P. R. China Department of Mathematics Huzhou Teachers College Huzhou 313000 P. R. China

As a natural generalization of a restricted Lie algebra, a restricted Lie triple system was defined by Hodge. In this paper, we develop initially the Frattini theory for restricted Lie triple systems, generalize some results of Frattini p-subalgebra for restricted Lie algebras, obtain some properties of the Frattini p-subsystem and give the relationship between Фp（T） and Ф（T） for solvable Lie triple systems.

关键词： Restricted Lie triple systems solvable Lie triple systems the Frattini p-subsystem the Frattini p-ideal

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On the Structure of Split Leibniz Triple Systems

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Acta Mathematica Sinica,English Series 2015年第10期31卷 1629-1644页

作者： Yan CAO liang yun CHEN School of Mathematics and Statistics Northeast Normal University Department of Basic Education Harbin University of Science and TechnologyRongcheng Campus

We study the structure of arbitrary split Leibniz triple systems with a coherent O-root space. By developing techniques of connections of roots for this kind of triple systems, under certain conditions, in the case of... 详细信息

关键词： Split Leibniz triple system Lie triple system Leibniz algebra system of roots root space

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Search for gamma-ray line signals around the black hole at the galactic center with DAMPE observation

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Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 150-158页

作者： Tian-Ci Liu Ji-Gui Cheng yun-Feng liang En-Wei liang Laboratory for Relativistic Astrophysics Department of PhysicsGuangxi UniversityNanning 530004China

The adiabatic growth of a black hole(BH)may enhance the dark matter(DM)density surrounding it,causing a spike in the DM density *** spike around the supermassive BH at the center of the Milky Way may lead to a dramatic enhancement of the gamma-ray flux of DM annihilation from the galactic center(GC).In this work,we analyze the gamma-ray data of the innermost region(i.e.,the inner 1°)of the GC to search for potential line-like signals from the BH *** line-like signals could be generated in the process of DM particles annihilating into double *** adopt the gamma-ray data from the Dark Matter Particle Explorer(DAMPE).Although the DAMPE has a much smaller effective area than the Fermi-LAT,the gamma-ray line search can benefit from its unprecedented high energy *** significant line-like signals are found in our *** derive upper limits on the cross section of the annihilation based on this *** find that despite the DAMPE’s small effective area for photon detection,we can still place strong constraints on the cross section(≥10^(-27)cm^(3)s^(-1))in the spike scenario due to the very bright model-expected flux from the *** results indicate that either DM does not annihilate primarily through theγγchannel in the mass range we considered or no sharp density spike is present at the GC.

关键词： dark matter γ-ray telescopes black holes galactic center

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Linking satellite-based spring phenology to temperate deciduous broadleaf forest photosynthesis activity

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International Journal of Digital Earth 2014年第11期7卷 881-896页

作者： Jing-Jing Zhao liang-yun Liu Key Laboratory of Digital Earth Science Center for Earth Observation and Digital EarthUniversity of Chinese Academy of SciencesBeijingChina

Satellite-based remote sensed phenology has been widely used to assess global climate ***,it is constrained by uncertain linkages with photo-synthesis *** dynamic threshold methods were employed to retrieve spring phenology metrics from four Moderate Resolution Imaging Spectro-radiometer(MODIS)products,including fraction of Absorbed Photosyntheti-cally Active Radiation(fAPAR),Leaf Area Index(LAI),Normalized Difference Vegetation Index(NDVI),and Enhanced Vegetation Index(EVI)for three temperate deciduous broadleaf forests in North America between 2001 and *** MODIS-based spring phenology metrics were subsequently linked to the photosynthetic curves(daily gross primary productivity,GPP)measured by an eddy covariance flux *** 20% dynamic threshold spring onset metrics from MODIS products were closer to the photosynthesis onset metrics at the date of 2% GPP increase for NDVI and fAPAR,and closer to the date of 5%and 10% increase of GPP for EVI and LAI,*** 50% dynamic threshold onset metrics were closer to the photosynthesis onset metrics at the date of 10%GPP increase for NDVI,and closer to the date of 20% GPP increase for fAPAR,LAI and EVI,*** results can improve our knowledge on the photosynthesis activity status of remotely sensed spring phenology metrics.

关键词： MODIS spring phenology deciduous broadleaf forest GPP eddy covariance flux tower photosynthesis activity period

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SST effect on the pre-monsoon intraseasonal oscillation over the South China Sea based on atmospheric-coupled GCM comparison

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Journal of Oceanology and Limnology 2023年第2期41卷 409-417页

作者： yun liang Yan DU Shang-Ping XIE State Key Laboratory of Tropical Oceanography&Key Laboratory of Science and Technology on Operational Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences&Innovation Academy of South China Sea Ecology and Environmental EngineeringGuangzhou 510301China College of Marine Science University of Chinese Academy of SciencesBeijing 100049China Peking University Chongqing Research Institute of Big Data Chongqing 401332China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 510301China Scripps Institution of Oceanography University of CaliforniaSan DiegoLa JollaCA 92093USA

The role of sea surface temperature(SST)variability in the pre-monsoonal(April to July)intraseasonal oscillation(ISO)over the South China Sea(SCS)is investigated using the Community Earth System Model Version 2(CESM2).An Atmospheric Model Intercomparison Project(AMIP)simulation forced by daily sea surface temperatures(SSTs)derived from a parallel coupled general circulation model(CGCM)run was compared with observations and the mother coupled *** the coupled model,the SST warming leads the peak convection about 1/4 period as in *** paralell uncoupled model fails to simulate this phase relationship,implying the importance of air-sea coupling in reproducing realistic *** to the near-quadrature phase relationship between SST and precipitation ISOs during the ISO events,it is difficult to distinguish the active/passive role of SST from observations *** correlation in intraseasonal precipitation between the daily SST-forced AMIP and mother CGCM runs indicates that SST plays a role in driving the atmospheric ISO.

关键词： intraseasonal variability South China Sea Community Earth System Model Version 2(CESM2) sea surface temperature

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Tracking guided actions recognition for cows

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Quantitative Biology 2022年第4期10卷 351-365页

作者： yun liang Xiaoming Chen Guangzhou Key Laboratory of Intelligent Agriculture College of Mathematics and InformaticsSouth China Agricultural UniversityGuangzhou 510642China

Background:Cows actions are important factors of cows health and their *** monitoring the individual cows actions,we prevent cows diseases and realize modern precision cows ***,traditional cows actions monitoring is usually conducted through video recording or direct visual observation,which is time-consuming and laborious,and often lead to misjudgement due to the subjective consciousness or ***:This paper proposes a method of cows actions recognition based on tracked trajectories to automatically recognize and evaluate the actions of ***,we construct a dataset including 60 videos to describe the popular actions existing in the daily life of cows,providing the basic data for designing our actions recognition ***,eight famous trackers are used to track and obtain temporal and spatial information of ***,after studying and analysing the tracked trajectories of different actions about cows,a rigorous and effective constraint method is designed to realize actions recognition by ***:Many experiments demonstrate that our method of actions recognition performs favourably in detecting the actions of cows,and the proposed dataset basically satisfies the actions evaluation for ***:The proposed tracking guided actions recognition provides a feasible way to maintain and promote cows health and welfare.

关键词： public framework actions recognition visual tracking precision agriculture cows health

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