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23rd IEEE Hot Chips Symposium, HCS 2011

作者： Fan, Dongrui Zhang, Hao Wang, Da Ye, Xiaochun Song, Fenglong Zhang, Junchao Fan, Lingjun Advanced Micro-System Group National Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences China

This article consists of a collection of slides from the author's conference presentation on the special features, system design, processing capabilities, and targeted markets for AMS's Godson-T microprocessor...

ISBN: (纸本)9781467388771

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A fine-grained component-level power measurement method

A fine-grained component-level power measurement method

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2011 International Green computing Conference, IGCC 2011

作者： Cui, Zehan Zhu, Yan Bao, Yungang Chen, Mingyu State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate School of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781457712203

The ever growing energy consumption of computer systems have become a more and more serious problem in the past few years. Power profiling is a fundamental way for us to better understand where, when and how energy is consumed. This paper presents a direct measurement method to measure the power of main computer components with fine time granularity. To achieve this goal, only small amount of extra hardware are employed. An approach to synchronize power dissipation with program phases has also been proposed in this paper. Based on the preliminary version of our tools, we measure the power of CPU, memory and disk when running SPEC CPU2006 benchmarks, and prove that measurement with fine time granularity is essential. The phenomenon we observe from memory power may be served as a guide for memory management or architecture design towards energy efficiency. © 2011 IEEE.

关键词： Energy efficiency

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Fault Tolerance and Recovery for Group Communication Services in Distributed Networks

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Journal of computer Science & technology 2012年第2期27卷 298-312页

作者：王跃华周忠 Ling Liu 吴威 State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China School of Computer Science and Engineering Beihang UniversityBeijing 100191China College of Computing Georgia Institute of TechnologyAtlanta 30332U.S.A.

Group communication services （GCSs） are becoming increasingly important as a wide field of promising applications has emerged to serve millions of users distributed across the ***,it is challenging to make the service fault tolerance and scalable to fulfill the voluminous demand of users in a distributed network （DN）.While many reliable group communication protocols have been dedicated to addressing such a challenge so as to accommodate the changes in the network,they are often costly or require complicated strategies to handle the service interruptions caused by node departures or link failures,which hinders the service *** this paper,we present two schemes to address the *** first one is a location-aware replication scheme called NS,which makes replicas in a dispersed fashion that enables the services on nodes to gain immunity of failures with different patterns （e.g.,network partition and single point failure） while keeping replication overhead *** second one is a novel failure recovery scheme that exploits the independence between service recovery and structure recovery in time domain to achieve quick failure *** simulation results indicate that the two proposed schemes outperform the existing schemes and simple alternative schemes in service success rate,recovery latency,and communication cost.

关键词： fault tolerance failure recovery replication location group communication

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SoftPCM: Enhancing energy efficiency and lifetime of phase change memory in video applications via approximate write

SoftPCM: Enhancing energy efficiency and lifetime of phase c...

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2012 IEEE 21st Asian Test Symposium, ATS 2012

作者： Fang, Yuntan Li, Huawei Li, Xiaowei State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9780769548760

Modern video applications such as video codecs are memory-intensive. As an emerging non-volatile memory technology, phase change memory (PCM) will benefit video applications due to its high density, low leakage power and superior scalability. However, PCM consumes high write energy and can only sustain a limited write number. Hence it is necessary to reduce the write number of PCM for video applications. In this paper, we propose Soft PCM to enhance both energy efficiency and lifetime of PCM. Soft PCM utilizes the error tolerance characteristic of video applications to relax the accuracy of write operations. Experimental results show that Soft PCM can reduce 22% writes and thus improve energy efficiency and lifetime of PCM with slight video quality degradation. © 2012 IEEE.

关键词： Phase change memory

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Characterizations and architectural implications of NVM's external DRAM cache 21

Characterizations and architectural implications of NVM's ex...

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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： Pan, Haiyang Liu, Yuhang Lu, Tianyue Chen, Mingyu University of Chinese Academy of Sciences Beijing China State Key Laboratory of Computer Architecture Institute of Computing Technology CAS Beijing China Peng Cheng Laboratory Shenzhen China

ISBN: (纸本)9781728120584

To meet the memory capacity requirement of big-data applications, a promising architecture is that NVM (Non-Volatile Memory) is used as main memory and external DRAM (off-chip) is used as cache. Compared to LLC versus DRAM (referred to as L-DRAM), external DRAM cache versus NVM main memory (referred to as E-NVM) are significantly different in terms of capacity and latency, thus traditional design cannot be directly borrowed without reconsideration. In this paper, we explore the characteristics and architectural implications of E-NVM in diverse dimensions including cache line granularity, associativity, replacement policy and prefetching methods. Lots of hints have been found for the optimal design of this emerging architecture. © 2019 IEEE.

关键词： Dynamic random access storage

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Automatic Classification of Plasmodium for Malaria Diagnosis based on Ensemble Neural Network 2020

Automatic Classification of Plasmodium for Malaria Diagnosis...

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2nd International Conference on Intelligent Medicine and Image Processing, IMIP 2020

作者： Shi, Lulin Guan, Zhen Liang, Chunzi You, Haihang State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Central South Hospital of Wuhan University Wuhan China

ISBN: (纸本)9781450377799

Malaria is one of the important public health issues of global concern. It is a kind of infectious disease caused by Plasmodium which can endanger human life and health. The examination of Plasmodium blood smear is the main method to diagnose malaria. Applying machine learning method to automatically analyze malaria smear images is very important for rapid diagnosis and surveillance of malaria. However, the existing machine learning methods need further improvement in feature extraction and generalization ability. For this reason, this paper introduces an ensemble neural network to automatically learn more accurate image features and achieve automatic classification of malaria images. In addition, we propose an adaptive threshold control method for cell segmentation, and then put the cell as center to extract images to obtain the training dataset, which solves the noise problem caused by sliding window cutting. And the idea of transfer learning is applied to solve the problem of shortage of training data. We additionally apply the proposed method to malaria image recognition and achieve 94.58% accuracy. The experimental results show that the model has good robustness and generalization ability and provides a valid data processing method for clinical malaria rapid diagnosis application. © 2020 ACM.

关键词： Diseases

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Simulating a Chern Insulator with C=±2 on Synthetic Floquet Lattice

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Chinese Physics Letters 2024年第9期41卷 1-8页

作者： Ling-Xiao Lei Wei-Chen Wang Guang-Yao Huang Shun Hu Xi Cao Xin-Fang Zhang Ming-Tang Deng Ping-Xing Chen Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China Institute for Quantum Information&State Key Laboratory of High Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China Greatwall Quantum Laboratory Changsha 410006China Hefei National Laboratory Hefei 230088China

The synthetic Floquet lattice,generated by multiple strong drives with mutually incommensurate frequencies,provides a powerful platform for quantum simulation of topological *** this study,we propose a 4-band tight-binding model of the Chern insulator with a Chern number C=±2 by coupling two layers of the half Bernevig–Hughes–Zhang lattice and subsequently mapping it onto the Floquet lattice to simulate its topological *** determine the Chern number of our Floquet-version model,we extend the energy pumping method proposed by Martin et al.[2017 ***.X 7041008]and the topological oscillation method introduced by Boyers et al.[2020 ***.125160505],followed by numerical simulations for both *** simulation results demonstrate the successful extraction of the Chern number using either of these methods,providing an excellent prediction of the phase diagram that closely aligns with the theoretical one derived from the original bilayer half Bernevig–Hughes–Zhang ***,we briefly discuss a potential experimental implementation for our *** work demonstrates significant potential for simulating complex topological matter using quantum computing platforms,thereby paving the way for constructing a more universal simulator for non-interacting topological quantum states and advancing our understanding of these intriguing phenomena.

关键词： properties topological quantum

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Understanding parallelism in graph traversal on multi-core clusters

Understanding parallelism in graph traversal on multi-core c...

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作者： Lv, Huiwei Tan, Guangming Chen, Mingyu Sun, Ninghui State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate School of Chinese Academy of Sciences Beijing China

There is an ever-increasing need for exploring large-scale graph data sets in computational sciences, social networks, and business analytics. However, due to irregular and memory-intensive nature, graph applications are notoriously known for their poor performance on parallel computer systems. In this paper we propose a new hybrid MPI/Pthreads breadth-first search (BFS) algorithm featuring with (i) overlapping computation and communication by separating them into multiple threads, (ii) maximizing multi-threading parallelism on multi-cores with massive threads to improve throughputs, and (iii) exploiting pipeline parallelism using lock-free queues for asynchronous communication. By comparing it with traditional MPI-only BFS algorithm, we learned several valuable lessons that would help to understand and exploit parallelism in graph traversal applications. Experiments show our algorithm is 1.9× faster than the MPI-only version, capable of processing 1.45 billion edges per second on a 32-node SMP cluster. At a large scale, our algorithm is 1.49× than the MPI-only BFS algorithm in Combinatorial BLAS Library with 6,144 cores. © 2012 Springer-Verlag.

关键词： Locks (fasteners)

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Statistical SDFC: A metric for evaluating test quality of small delay faults

Statistical SDFC: A metric for evaluating test quality of sm...

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2012 International Symposium on VLSI Design, Automation and Test, VLSI-DAT 2012

作者： Zhu, Xuefeng Li, Huawei Li, Xiaowei State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781457720819

As the technology node continues to shrink, an effective and accurate metric is essential to measure the test quality of small delay faults (SDFs), which may cause failure at circuit outputs. Owing to including gross delay fault (GDF) coverage, prior metrics cannot concentrate on the detection of SDFs. We propose a new metric, statistical SDF Coverage (S-SDFC), for differentiating SDFs and GDFs and evaluating the test quality of SDFs under the statistical delay quality model. Experimental results show that S-SDFC is more conservative and effective in evaluating the quality of test sets in detecting SDFs and outperforms other metrics in guiding test generation. © 2012 IEEE.

关键词： Testing

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Libvmi: A library for bridging the semantic gap between guest OS and VMM

Libvmi: A library for bridging the semantic gap between gues...

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2012 IEEE 12th International Conference on computer and Information technology, CIT 2012

作者： Xiong, Haiquan Liu, Zhiyong Xu, Weizhi Jiao, Shuai State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9780769548586

Semantic gap is one of the most important problems in the virtualized computer systems. Solving this problem not only helps to develop security and virtual machine monitoring applications, but also benefits for VMM resource management and VMM-based service implementation. In this paper, we first review the general architecture of virtual computer systems, especially the interaction principles between Guest OS and VMM so as to better understand the causes of semantic gap. Then we consider how to build a library that can integrate the commonalities existing in different VMMs and Guest OSes. It should be general enough to facilitate the above mentioned applications development. In order to more clearly illustrate this issue, we select Libvmi as the case study, elaborating its design philosophy and implementation. Finally, we describe how to use Libvmi with two application examples and verify its correctness and effectiveness. © 2012 IEEE.

关键词： Virtualization

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