• Title, Summary, Keyword: Virtual Machine

Search Result 729, Processing Time 0.055 seconds

The feasibility and properties of dividing virtual machine resources using the virtual machine cluster as the unit in cloud computing

  • Peng, Zhiping;Xu, Bo;Gates, Antonio Marcel;Cui, Delong;Lin, Weiwei
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.9 no.7
    • /
    • pp.2649-2666
    • /
    • 2015
  • In the dynamic cloud computing environment, to ensure, under the terms of service-level agreements, the maximum efficiency of resource utilization, it is necessary to investigate the online dynamic management of virtual machine resources and their operational application systems/components. In this study, the feasibility and properties of the division of virtual machine resources on the cloud platform, using the virtual machine cluster as the management unit, are investigated. First, the definitions of virtual machine clusters are compared, and our own definitions are presented. Then, the feasibility of division using the virtual machine cluster as the management unit is described, and the isomorphism and reconfigurability of the clusters are proven. Lastly, from the perspectives of clustering and cluster segmentation, the dynamics of virtual machines are described and experimentally compared. This study aims to provide novel methods and approaches to the optimization management of virtual machine resources and the optimization configuration of the parameters of virtual machine resources and their application systems/components in large-scale cloud computing environments.

Virtual Machine Code Optimization using Profiling Data (프로파일링 데이터를 이용한 가상기계 코드 최적화)

  • Shin, Yang-Hoon;Yi, Chang-Hwan;Oh, Se-Man
    • The KIPS Transactions:PartA
    • /
    • v.14A no.3
    • /
    • pp.167-172
    • /
    • 2007
  • VM(Virtual Machine) can be considered as a software processor which interprets the machine code. Also, it is considered as a conceptional computer that consists of logical system configuration. But, the execution speed of VM system is much slower than that of a real processor system. So, it is very important to optimize the code for virtual machine to enhance the execution time. Especially the optimizer for a virtual machine code on embedded devices requires the highly efficient performance to the ordinary optimizer in the respect to the optimized ratio about cost. Fundamentally, functions and basic blocks which influence the execution time of virtual machine is found, and then an optimization for them nay get the high efficiency. In this paper, we designed and implemented the optimizer for the virtual(or abstract) machine code(VMC) using profiling. Firstly, we defined the profiling information which is necessary to the optimization of VMC. The information can be obtained from dynamically executing the machine code. And we implemented VMC optimizer using the profiling information. In our implementation, the VMC is SIL(Standard Intermediate Language) that is an intermediate code of EVM(Embedded Virtual Machine). Also, we tried a benchmark test for the VMC optimizer and obtained reasonable results.

Error Recovery Technique for Improving Reliability of Embedded Systems

  • Son, Sunghoon
    • Journal of the Korea Society of Computer and Information
    • /
    • v.22 no.6
    • /
    • pp.1-8
    • /
    • 2017
  • In this paper, we propose a fault tolerance technique which enables embedded systems to run without interruption while its operating system and tasks fail. In order to improve reliability, the proposed scheme makes an embedded system run as a virtual machine on virtual machine monitor. It also prepares a contingency virtual machine at which periodical backups of the embedded system are saved. When an error occurs in the main virtual machine, the corresponding standby virtual machine takes a role of the main virtual machine and continues its operation. Especially such backups and switches of virtual machines are performed with minor performance degradation by manipulating page table entries in virtual machine monitor. By conducting performance evaluation studies, we show that the proposed scheme makes embedded system robust against errors while it does not degrade the performance of the system significantly.

A Study on the Fault Diagnosis in Web-based Virtual Machine (웹기반 가상시계에서의 고장진단에 관한 연구)

  • 서정완;강무진
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • /
    • pp.430-434
    • /
    • 2001
  • Virtual manufacturing system is integrated computer model that represents the precise and whole structure of manufacturing system and simulates its physical and logical behavior in operation.[1] A virtual machine is computer model that represents a CNC machine tool and one of core elements of virtual manufacturing system. In this paper, it is emphasized that a virtual machine must be web-based system for serving information to all attendants in a real machine tool without the restriction of time or location, and then in the fault diagnosis, one of important modules of a virtual machine, the methods of both using the controller signal and web-based expert system are proposed.

  • PDF

Implementation of Web-based Virtual Machine Tools (Web 기반 가상공작기계의 구현)

  • 정광식;서석환;서윤호;이현수
    • Korean Journal of Computational Design and Engineering
    • /
    • v.6 no.4
    • /
    • pp.236-243
    • /
    • 2001
  • A key factor far realizing the internet-based virtual manufacturing system(VMS) and virtual enter-prise(VE) is how to precisely and effectively represent the machine elements and mechanics. In this paper, we present methods to represent the numerically controlled machine tools in the internet environment. The method is composed of: 1) geometrical modeling of the machine tools, 2) kinematic modeling for the movements of the machine tools, and 3) representing the developed model in the internet infrastructure. Based on the models. a web-based virtual machine tools (WVMT) is developed, and it can be accessed at hrrp://wvmt.postech.ac.kr. The WVMT can be used for various purposes: 1) web-based virtual manufacturing system, 2) web-based CAM system, and 3) CNC educational tools for the vocational school through internet.

  • PDF

Vxworks Base Java Virtual Machine Development (VxWorks Base Java Virtual Machine 개발)

  • 박상현;고재진;민수영
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.193-196
    • /
    • 2002
  • Nowadays, many users use internet and many set-top box needs browser for Internet. so we need to develop a Java Virtual Machine to improve browser's performance. This paper has been studied a Java Virtual Machine based on Real-Time 05 Vxwroks. Java Virtual Machine handles Java byte-code quickly in Browser So, this paper has designed module and interfaces for Embedded Browser and Implemented them.

  • PDF

DTSTM: Dynamic Tree Style Trust Measurement Model for Cloud Computing

  • Zhou, Zhen-Ji;Wu, Li-Fa;Hong, Zheng;Xu, Ming-Fei;Pan, Fan
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.8 no.1
    • /
    • pp.305-325
    • /
    • 2014
  • In cloud computing infrastructure, current virtual machine trust measurement methods have many shortcomings in dynamism, security and concurrency. In this paper, we present a new method to measure the trust of virtual machine. Firstly, we propose "behavior trace" to describe the state of virtual machine. Behavior trace is a sequence of behaviors. The measurement of behavior trace is conducted on the basis of anticipated trusted behavior, which not only ensures security of the virtual machine during runtime stage but also reduces complexity of the trust measurement. Based on the behavior trace, we present a Dynamic Tree Style Trust Measurement Model (DTSTM). In this model, the measurement of system domain and user domain is separated, which enhances the extensibility, security and concurrency of the measurement. Finally, based on System Call Interceptor (SCI) and Virtual Machine Introspection (VMI) technology, we implement a DTSTM prototype system for virtual machine trust measurement. Experimental results demonstrate that the system can effectively verify the trust of virtual machine and requires a relatively low performance overhead.

Executing System of Virtual Machine Code using Decompiling Method (역컴파일링 기법을 이용한 가상기계 코드 실행 시스템)

  • Ahn, Duk-Ki;Yi, Chang-Hwan;Oh, Se-Man
    • The KIPS Transactions:PartA
    • /
    • v.14A no.2
    • /
    • pp.91-98
    • /
    • 2007
  • Generally, virtual machine platform is composed of a compiler, an assembler, and VM(Virtual Machine). To develop it, the design of VMC(Virtual Machine Code) is an essential task. And it is very important to verify the virtual machine platform. To do this and furthermore to execute VMC, it needs to implement VMC execution system using compiling method, interpreting method, or decompiling method. In this paper, we suggested and implemented the executing system of VMC using decompiling method out of three methods to execute the VMC. In our implementation, the VMC is SIL(Standard Intermediate Language) that is an intermediate code of EVM(Embedded Virtual Machine). Actually, we verified the usefulness of the decompiling method. And the decompiling method suggested in this paper can be used to minimize the mistake in developing Virtual machine platform.

Fault Diagnosis in a Virtual Machine using CORBA (CORBA를 이용한 가상기계에서의 고장진단에 관한 연구)

  • 서정완;강무진;정순철;김성환
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • /
    • pp.109-114
    • /
    • 1997
  • As CNC machine tool is one of core elements of manufacturing system, it is much important that it remains without troubleshoots. As a virtual machine is a recent alternative using IT for optimal utilization of CNC machine tool, it is a computer model that represents a CNC machine tool. But a virtual machine is still conceptual. So, in this paper, it is proposed that a virtual machine be a realistic model in the fault diagnosis module. For this purpose, the fault diagnosis system of machine tool using CORBA and fault diagnosis expert system has been implemented. Using this system, we have expections to diagnose exactly and prompty without the restriction of time or location, to reduce MTTR(Mean Time To Repair) and finally to increase the availability of manufacturing system.

  • PDF