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Cacheap:Portable and Collaborative I/O Optimization for Graph Processing

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Journal of Computer Science & Technology 2019年第3期34卷 690-706页

作者： Peng Zhao Chen Ding Lei Liu Jiping Yu Wentao Han xiao-bing feng State Key Laboratory of Computer Architecture Institute of Computing TechnologyChinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Computer Science University of RochesterRochester 14623U.S.A. Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China

Increasingly there is a need to process graphs that are larger than the available memory on today's *** systems have been developed with grapli representations that are efficient and compact for out-of-core processing.A necessary task in these systems is memory *** paper presents a system called Cacheap which automatically and efficiently manages the available memory to maximize the speed of grapli processing,minimize the amount of disk access,and maximize the utilization of memory for graph *** has a simple interface that can be easily adopted by existing graph *** paper describes the new system,uses it in recent graph engines,and demonstrates its integer factor improvements in the speed of large-scale grapli processing.

关键词： out-of-core graph processing system I/O optimization memory cache graph analytics locality

A Hybrid Circular Queue Method for Iterative Stencil Computations on GPUs

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Journal of Computer Science & Technology 2012年第1期27卷 57-74页

作者： Yang Yang Hui-Min Cui xiao-bing feng Jing-Ling Xue State Key Laboratory of Computer Architecture Institute of Computing TechnologyChinese Academy of Sciences Beijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100190China Programming Languages and Compilers Group School of Computer Science and Engineering University of New South WalesSydneyNSW 2052Australia

In this paper, we present a hybrid circular queue method that can significantly boost the performance of stencil computations on GPU by carefully balancing usage of registers and shared-memory. Unlike earlier methods that rely on circular queues predominantly implemented using indirectly addressable shared memory, our hybrid method exploits a new reuse pattern spanning across the multiple time steps in stencil computations so that circular queues can be implemented by both shared memory and registers effectively in a balanced manner. We describe a framework that automatically finds the best placement of data in registers and shared memory in order to maximize the performance of stencil computations. Validation using four different types of stencils on three different GPU platforms shows that our hybrid method achieves speedups up to 2.93X over methods that use circular queues implemented with shared-memory only.

关键词： stencil computation circular queue GPU occupancy register

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Thermal error modeling based on BiLSTM deep learning for CNC machine tool

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Advances in Manufacturing 2021年第2期9卷 235-249页

作者： Pu-Ling Liu Zheng-Chun Du Hui-Min Li Ming Deng xiao-bing feng Jian-Guo Yang School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

The machining accuracy of computer numerical control machine tools has always been a focus of the manufacturing *** all errors,thermal error affects the machining accuracy *** of the significant impact of Industry 4.0 on machine tools,existing thermal error modeling methods have encountered unprecedented challenges in terms of model complexity and capability of dealing with a large number of time series data.A thermal error modeling method is proposed based on bidirectional long short-term memory(BiLSTM)deep learning,which has good learning ability and a strong capability to handle a large group of dynamic data.A four-layer model framework that includes BiLSTM,a feedforward neural network,and the max pooling is *** elaborately designed algorithm is proposed for better and faster model *** window length of the input sequence is selected based on the phase space reconstruction of the time *** model prediction accuracy and model robustness were verified experimentally by three validation tests in which thermal errors predicted by the proposed model were compensated for real workpiece *** average depth variation of the workpiece was reduced from approximately 50μm to less than 2μm after *** reduction in maximum depth variation was more than 85%.The proposed model was proved to be feasible and effective for improving machining accuracy significantly.

关键词： Thermal error Error modeling Bidirectional long short-term memory(BiLSTM) Phase space reconstruction Computer numerical control(CNC)machine tool

Pragma Directed Shared Memory Centric Optimizations on GPUs

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Journal of Computer Science & Technology 2016年第2期31卷 235-252页

作者： Jing Li CCF, Lei Liu Yuan Wu Xiang-Hua Liu Yi Gao xiao-bing feng Cheng-YongWu State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Beijing Samsung Telecom Research and Development Center Beijing 100028 China

GPUs become a ubiquitous choice as coprocessors since they have excellent ability in concurrent processing. In GPU architecture, shared memory plays a very important role in system performance as it can largely improve bandwidth utilization and accelerate memory operations. However, even for affine GPU applications that contain regular access patterns, optimizing for shared memory is not an easy work. It often requires programmer expertise and nontrivial parameter selection. Improper shared memory usage might even underutilize GPU resource： Even using state-of-the-art high level programming models （e.g., OpenACC and OpenHMPP）, it is still hard to utilize shared memory since they lack inherent support in describing shared memory optimization and selecting suitable parameters, let alone maintaining high resource utilization. Targeting higher productivity for affine applications, we propose a data centric way to shared memory optimization on GPU. We design a pragma extension on OpenACC so as to convey data management hints of programmers to compiler. Meanwhile, we devise a compiler framework to automatically select optimal parameters for shared arrays, using the polyhedral model. We further propose optimization techniques to expose higher memory and instruction level parallelism. The experimental results show that our shared memory centric approaches effectively improve the performance of five typical GPU applications across four widely used platforms by 3.7x on average, and do not burden programmers with lots of pragmas.

关键词： GPU shared memory pragma directed data centric

VTensor:Using Virtual Tensors to Build a Layout-Oblivious AI Programming Framework

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Journal of Computer Science & Technology 2023年第5期38卷 1074-1097页

作者：俞峰赵家程崔慧敏冯晓兵薛京灵 Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China School of Computer Science and Technology University of Chinese Academy of SciencesBeijing 100080China School of Computer Science and Engineering University of New South WalesSydney 1466Australia

Tensors are a popular programming interface for developing artificial intelligence(AI)*** refers to the order of placing tensor data in the memory and will affect performance by affecting data locality;therefore the deep neural network library has a convention on the *** AI applications can use arbitrary layouts,and existing AI systems do not provide programming abstractions to shield the layout conventions of libraries,operator developers need to write a lot of layout-related code,which reduces the efficiency of integrating new libraries or developing new ***,the developer assigns the layout conversion operation to the internal operator to deal with the uncertainty of the input layout,thus losing the opportunity for layout *** on the idea of polymorphism,we propose a layout-agnostic virtual tensor programming interface,namely the VTensor framework,which enables developers to write new operators without caring about the underlying physical layout of *** addition,the VTensor framework performs global layout inference at runtime to transparently resolve the required layout of virtual tensors,and runtime layout-oriented optimizations to globally minimize the number of layout transformation *** results demonstrate that with VTensor,developers can avoid writing layout-dependent *** with TensorFlow,for the 16 operations used in 12 popular networks,VTensor can reduce the lines of code(LOC)of writing a new operation by 47.82%on average,and improve the overall performance by 18.65%on average.

关键词： artificial intelligence(AI)programming layout-oblivious tensor processing

Modulatory effect of aquaporin 5 on estrogen-induced epithelial-mesenchymal transition in prostate epithelial cells

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Chinese Medical Journal 2021年第4期134卷 448-455页

作者： Yu Fan Tu-Run Song Qiang Wei Lu Yang Tao Lin xiao-bing feng Xian-Ding Wang Zhong-Li Huang Shi-Jian feng Department of Urology Institute of UrologyOrgan Transplantation CenterWest China Hospital of Sichuan UniversityChengduSichuan 610041China

Background:Estrogen is involved in the pathophysiological process of benign prostatic hyperplasia(BPH),in which epithelial-mesenchymal transition(EMT)plays an important *** of aquaporin(AQP)5,which is directly activated by estrogen,has been reported to promote EMT in multiple *** study aimed to examine the effects of AQP5 on estrogen-induced EMT in the ***:Normal prostate(NP)tissue samples without any histopathological changes and BPH tissue samples with pathologically confirmed hyperplasia were *** EMT cell model was subsequently established by adding estradiol(E2)to RWPE-1 cells,after which AQP5 knockdown was *** morphological and immunohistochemical features were examined using hematoxylin-eosin and immunohistochemical *** blot analysis was performed to determine the expression of AQPs,estrogen receptors,and EMT-related *** proliferation was assessed and supernatants were collected for enzyme-linked immunosorbent assay to determine transforming growth factor-β1(TGF-β1)*** staining was performed to assess protein expressions in RWPE-1 ***:BPH tissues exhibited greater EMT(TGF-β1:1.362±0.196 vs.0.107±0.067,P=0.003;vimentin:1.581±0.508 vs.0.221±0.047,P<0.001;E-cadherin:0.197±0.188 vs.1.344±0.088,P<0.001),higher AQP5(1.268±0.136 vs.0.227±0.055,P<0.001)and estrogen receptor(ER)α(1.250±0.117 vs.0.329±0.134,P<0.001)expression but lower ERβ(0.271±0.184 vs.1.564±0.130,P<0.001)expression than NP tissues.E2-stimulated cells had higher AQP5 expression(1.298±0.058 vs.1.085±0.104,P=0.049),increased cell proliferation(1.510±0.089 vs.1.000±0.038,P<0.001),and EMT(TGF-β1 concentration:0.352±0.021 ng/mL vs.0.125±0.014 ng/mL,P<0.001;vimentin:1.641±0.120 vs.0.188±0.020,P=0.002;E-cadherin:0.075±0.030 vs.0.843±0.046,P<0.001)than controls.E2-stimulated cells with AQP5 knockdown exhibited decreased EMT(TGF-β1 concentration:0.223±0.041 ng/mL vs.0.352±0.021 ng/mL,P=0.016;vi

关键词： Aquaporin Benign prostatic hyperplasia Epithelial-mesenchymal transition Estrogen Prostate epithelial cells

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(λ,μ)-反模糊子环和(λ,μ)-反模糊理想

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模糊系统与数学 2012年第3期26卷 63-69页

作者：肖丙峰姚炳学聊城大学数学科学学院山东聊城252059

引入(λ,μ)-反模糊子环及各种(λ,μ)-反模糊理想的概念,得到了(λ,μ)-反模糊子环及各种(λ,μ)-反模糊理想的等价条件及其性质,建立了同态映射下(λ,μ)-反模糊子环及各种(λ,μ)-反模糊理想的对应定理。

关键词：同态 (λ,μ)-反模糊子环 (λ,μ)-反模糊理想

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Automatic Target Description File Generation

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Journal of Computer Science & Technology 2023年第6期38卷 1339-1355页

作者：耿洪娜吕方钟茗崔慧敏薛景玲冯晓兵 State Key Laboratory of Processors Institute of Computing TechnologyChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Computer Science and Engineering University of New South WalesSydneyNSW 2052Australia

Agile hardware design is gaining increasing momentum and bringing new chips in larger quantities to the market ***,it also takes new challenges for compiler developers to retarget existing compilers to these new chips in shorter time than ever ***,retargeting a compiler backend,e.g.,an LLVM backend to a new target,requires compiler developers to write manually a set of target description files(totalling 10300+lines of code(LOC)for RISC-V in LLVM),which is error-prone and *** this paper,we introduce a new approach,Au-tomatic Target Description File Generation(ATG),which accelerates the generation of a compiler backend for a new tar-get by generating its target description files *** a new target,ATG proceeds in two ***,ATG synthesizes a small list of target-specific properties and a list of code-layout templates from the target description files of a set of existing targets with similar instruction set architectures(ISAs).Second,ATG requests compiler developers to fill in the information for each instruction in the new target in tabular form according to the list of target-specific properties syn-thesized and then generates its target description files automatically according to the list of code-layout templates *** first stage can often be reused by different new targets sharing similar *** evaluate ATG using nine RISC-V instruction sets drawn from a total of 1029 instructions in LLVM *** enables compiler developers to gen-erate compiler backends for these ISAs that emit the same assembly code as the existing compiler backends for RISC-V but with significantly less development effort(by specifying each instruction in terms of up to 61 target-specific properties only).

关键词： retargetability compiler target description target backend automatic generator

Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： xiao Xiang feng Gao Yu-Gui Peng Peng Wu Zong-Lin Li Xue-feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states