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Computer Software 2016年第4期33卷 4-15页

作者： Hatano, Tomomi Ishio, Takashi Inoue, Katsuro Graduate School of Information Science and Technology Osaka University Japan

For program analysis of java in software engineering, control-flow, data dependence, control dependence, and method call relationships are often required. Existing tools provide features to extract the required information, however, it is difficult to use the tools for users who are unfamiliar with algorithms for program analysis. SOBA (Simple Objects for Bytecode Analysis) is a class library that is easy to use without detailed knowledge of program analysis. This paper introduces main features, design policy, and example programs of SOBA.

关键词： java programming language

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An operating system for real-time applications with java on TINI

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International Journal of Simulation: Systems, Science and Technology 2016年第36期17卷 7.1-7.9页

作者： Lu, Qinghua Li, Shanshan Zhang, Weishan College of Computer and Communication Engineering China University of Petroleum QingdaoShandong266555 China

Safety is the main concern for RTOSes. Choosing a good programming language can significantly improve the safety of the RTOSes. In this paper, we investigate the advantages and disadvantages of developing RTOSes in java. We design an RTOS named JAOS that schedules processes on a micro-controller called TINI. In the context of achieving real-time performance, we look at the issues of implementing our system design in java. We introduce how we used java constructs to implement the design of JAOS, and how we solved the low-level issues. We measure the performance of JAOS to investigate timing problems and provide the right information at minimal cost in performance. As a safe language, java is suitable for coding a safety-critical RTOS. © 2016, UK Simulation Society. All rights reserved.

关键词： java programming language

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java2SDG: Stateful Big Data Processing for the Masses

Java2SDG: Stateful Big Data Processing for the Masses

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IEEE International Conference on Data Engineering

作者： Raul Castro Fernandez Panagiotis Garefalakis Peter Pietzuch Imperial College London United Kingdom

ISBN: (纸本)9781509020218

Big data processing is no longer restricted to specially-trained engineers. Instead, domain experts, data scientists and data users all want to benefit from applying data mining and machine learning algorithms at scale. A considerable obstacle towards this "democratisation of big data" are programming models: current scalable big data processing platforms such as Spark, Naiad and Flink require users to learn custom functional or declarative programming models, which differ fundamentally from popular languages such as java, Matlab, Python or C++. An open challenge is how to provide a big data programming model for users that are not familiar with functional programming, while maintaining performance, scalability and fault tolerance. We describe java2SDG, a compiler that translates annotated java programs to stateful dataflow graphs (SDGs) that can execute on a compute cluster in a data-parallel and fault-tolerant fashion. Compared to existing distributed dataflow models, a distinguishing feature of SDGs is that their computational tasks can access distributed mutable state, thus allowing SDGs to capture the semantics of stateful java programs. As part of the demonstration, we provide examples of machine learning programs in java, including collaborative filtering and logistic regression, and we explain how they are translated to SDGs and executed on a large set of machines.

关键词： big data java java programming language Consumers data parallel Fault tolerance data mining Machine learning algorithms Functional programming collaborative filtering setting machine Semantics data flow

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Object Layout Optimization in the JVM Based on Affinity

Object Layout Optimization in the JVM Based on Affinity

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IEEE Canadian Conference on Electrical and Computer Engineering

作者： Taees Eimouri Kenneth B. Kent Aleksandar Micic Karl Taylor Faculty of Computer Science University of New Brunswick IBM Ottawa Canada

ISBN: (纸本)9781467387224

Improving spatial locality has a great impact on improving cache performance by reducing the number of cache misses. Object model optimization is one way to improve the locality of references inside particular objects. This paper extends the object layout optimization study by focusing on the internal layout of java objects in applications running on the java Virtual Machine (JVM). In this research, the IBM JVM is modified to be able to organize fields inside java objects based on their access frequency and access order. Our results show reductions in the number of cache misses in the 20% range and an almost 40% speed up in some benchmarks.

关键词： java Virtual Machine (JVM) Affine transformation affinity Cache memory spatial locality java java programming language layouts reduction index one way Access

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A Profiling Tool for Exploiting use of Packed Objects in java Programs

A Profiling Tool for Exploiting use of Packed Objects in Jav...

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IEEE Canadian Conference on Electrical and Computer Engineering

作者： Umang Pandya Kenneth B. Kent Eric Aubanel Karl Taylor Centre for Advanced Studies--Atlantic University of New Brunswick Fredericton Canada E3B 5A3 IBM Canada Kanata Canada K2V 1C8

ISBN: (纸本)9781467387224

Packed objects are an experimental feature in the IBM J9 Virtual Machine. Packed objects can be used to gain greater control over the layout of objects in memory and greater flexibility of memory structures that are not in java code, to reduce the amount of memory required to store objects, and to increase the efficiency of caching. If the application is accessing a significant amount of native data using JNI method calls, then the use of packed objects will eliminate marshalling/unmarshalling of native data into java objects and thus eliminate redundant data copying. The purpose of developing this profiling tool is to assist software developers in determining how much memory can be saved if they switch to packed objects from standard java objects. The correctness and usefulness of the profiling tool is evaluated by running several test programs. Based on the results, the programs were modified to use packed objects instead of standard java objects and the reduction in memory consumption was measured.

关键词： java java programming language Memory Memory redundant data Profile tools Cache memory accuracy class

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SUIS: An online graphical Signature-Based User Identification System

SUIS: An online graphical Signature-Based User Identificatio...

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International Conference on Digital Information and Communication Technology and it's Applications (DICTAP)

作者： Shahid Alam Department of Computer Science and Engineering Qatar University Doha Qatar

ISBN: (纸本)9781467396103

Humans possess a large amount of, and almost limitless, visual memory, that assists them to remember pictures far better than words. This phenomenon has recently motivated the computer security researchers' in academia and industry to design and develop graphical user identification systems (GUISs). Cognometric GUISs are more memorable than drawmetric GUISs, but takes more time to authenticate. None of the previously proposed GUISs combines the advantages of both cognometric and drawmetric systems. A signature personify a person and a graphical signature is easier to recall than other drawings. This paper proposes a new graphical Signature-based User Identification System named SUIS. It is based on a 2D grid technology, that is used to draw, digitize and store the signature for user identification. SUIS is categorized as both a cognometric and drawmetric system. Unlike other systems that use 2D grid: We take one cell in a grid as one pixel in the drawing; for signature matching, the signature drawn has to follow the same grid cells as the signature stored, independent of the sequence; and that the system is not based on any machine learning model. Increasing the number of grid cells increases the password space, and decreasing the size of the grid cell increases the precision of the signature. These characteristics makes SUIS: (1) Rigorous enough to be a password system, but easy enough to be usable. (2) Independent of the language and device used to draw the signature. (3) Efficient and practical to be used for online authentication systems. Currently we are developing a prototype tool in java to implement SUIS and will carry out a study with a large number of participants to evaluate the validity of SUIS.

关键词： security of data digital signatures graphical user interfaces identification technology java learning (artificial intelligence) identification technology Grid Cells digital signatures graphical user interfaces Data Security java java programming language user id signatures grids drawing

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JAS: JVM-based active storage framework for object-based storage systems

International Journal of Database Theory and Application

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International Journal of Database Theory and Application 2016年第7期9卷 121-134页

作者： Li, Xiangyu He, Shuibing Xu, Xianbin Wang, Yang School of computer Wuhan University Wuhan Hubei430072 China State Key Laboratory of High Performance Computing National University of Defense Technology Changsha Hunan410073 China Shenzhen Institute of Advanced Technology China Academy of Science Shenzhen518055 China Wuhan Donghu University Wuhan Hubei430212 China

We propose JAS, a JVM-based active storage framework for object-based storage systems. JAS programs the active storage functions of users as java codes, and allows them to be executed on different OSD platforms (Operating systems and hardware) without recompiling. JAS offloads the active storage code from a client to the OSD by extending the standard OSD command set, and execute the java code on the OSD on-demand by triggering them through extended client interfaces. We have implemented JAS under an object-based storage system. Experimental results show that the JVM-based active storage framework has been successfully set up, and this cross-platform design can largely improve system performance. © 2016 SERSC.

关键词： java programming language

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Real-Time Generation Capacity Monitoring With Consideration of Transmission Constraints

Real-Time Generation Capacity Monitoring With Consideration ...

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IEEE Power and Energy Society General Meeting

作者： Fengyu Wang Yaming Ma Yonghong Chen Midcontinent Independent System Operator Inc. (MISO) Carmel IN Indiana

ISBN: (纸本)9781509041695

In real time market operations, operators need to monitor available on-line capacity and evaluate whether online resources and upcoming commitment can meet both energy balance and reserve requirement in the near future. However, available online generation capacity may not always be deliverable due to transmission congestion. This paper proposed a deliverable generation capacity calculation formulation considering transmission constraints. A web-based generation capacity monitoring tool is developed to provide operators a quick estimate of maximum available capacity with consideration of deliverability and ramping capability. Numerical results on Midcontinent Independent System Operator (MISO) system are studied and analyzed in this paper as well.

关键词： Monitoring MISO Real-time systems Load flow Uncertainty Indexes java multiple-input single-output load flow PLANT CAPACITY real-time systems java java programming language Uncertainty Online resources

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Effects of False Sharing and Locality on Object Layout Optimization for Multi-Threaded Applications

Effects of False Sharing and Locality on Object Layout Optim...

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IEEE Canadian Conference on Electrical and Computer Engineering

作者： Taees Eimouri Kenneth B. Kent Aleksandar Micic Faculty of Computer Science University of New Brunswick Fredericton Canada IBM Ottawa Canada

ISBN: (纸本)9781467387224

One approach to decrease the gap between memory latency and processor speed is improving locality of data. Data layout optimization is a way to increase locality by reordering data elements in memory. Unfortunately, for multi-threaded applications, the issue is more complex due to the effects of false sharing. In this paper, the effect of locality and false sharing on multi-threaded applications is investigated. Therefore, fields are reordered inside java objects in such a way that improves the locality of reference among them and also decreases the estimated probability of false sharing. Considering the role of the JVM in laying out java objects fields, IBM's JVM is modified with the ability to reorganize fields based on the profiled information.

关键词： False java Virtual Machine (JVM) memory latency java java programming language layouts data elements Road multi-threaded application

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Cache and energy efficient algorithms for Nussinov RNA folding

Cache and energy efficient algorithms for Nussinov RNA foldi...

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IEEE International Conference on Computational Advances in Bio and Medical Sciences (ICCABS)

作者： Chunchun Zhao Sartaj Sahni Department of Computer and Information Science and Engineering University of Florida USA

ISBN: (纸本)9781509042005

We propose three cache-efficient algorithms, ByRow, ByRowSegment and ByBox, for RNA folding using Nussinov's dynamic programming equations [1]. These algorithms, along with the cache-efficient Transpose algorithm of Li et al [2]. and the Classical algorithm of Nussinov are analyzed using a simple LRU cache model. For this model, Classical has the highest number of cache misses followed by Transpose, ByRow, ByRowSegment, and ByBox (in this order). Extensive experiments conducted on a single core of a Xeon E5 server, using two programming languages-C and java-show that cache efficiency translates into time and energy efficiency. For example, our benchmarking shows that, when the algorithms are programmed in C, our ByBox algorithm reduces run time by as much as 91∶3% and energy consumption by as much as 90∶8% relative to Classical and by as much as 56∶3% and 57∶9%, respectively, relative to Transpose. In the java programming language, ByBox takes up to 88∶9% less time than Classical and up to 74∶9% less than Transpose. Also, using the same amount of memory, the algorithms proposed by us can solve problems up to 40% larger than those solvable by Transpose.

关键词： Transpose Cache memory RNA Folding Energy efficiency efficient algorithm algorithms java programming language Runtime BENCHMARKS

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