The initiative of internet-based virtual computing environment(iVCE) aims to provide the end users and applications with a harmonious,trustworthy and transparent integrated computing environment which will facilitate ...The initiative of internet-based virtual computing environment(iVCE) aims to provide the end users and applications with a harmonious,trustworthy and transparent integrated computing environment which will facilitate sharing and collaborating of network resources between applications.Trust management is an elementary component for iVCE.The uncertain and dynamic characteristics of iVCE necessitate the requirement for the trust management to be subjective,historical evidence based and context dependent.This paper presents a Bayesian analysis-based trust model,which aims to secure the active agents for selecting appropriate trusted services in iVCE.Simulations are made to analyze the properties of the trust model which show that the subjective prior information influences trust evaluation a lot and the model stimulates positive interactions.展开更多
Internet-based virtual computing environment(iVCE) has been proposed to combine data centers and other kinds of computing resources on the Internet to provide efficient and economical services.Virtual machines(VMs) ha...Internet-based virtual computing environment(iVCE) has been proposed to combine data centers and other kinds of computing resources on the Internet to provide efficient and economical services.Virtual machines(VMs) have been widely used in iVCE to isolate different users/jobs and ensure trustworthiness,but traditionally VMs require a long period of time for booting,which cannot meet the requirement of iVCE's large-scale and highly dynamic applications.To address this problem,in this paper we design and implement VirtMan,a fast booting system for a large number of virtual machines in iVCE.VirtMan uses the Linux Small Computer System Interface(SCSI) target to remotely mount to the source image in a scalable hierarchy,and leverages the homogeneity of a set of VMs to transfer only necessary image data at runtime.We have implemented VirtMan both as a standalone system and for Open Stack.In our 100-server testbed,VirtMan boots up 1000 VMs(with a 15 GB image of Windows Server 2008) on 100 physical servers in less than 120 s,which is three orders of magnitude lower than current public clouds.展开更多
作为面向互联网资源共享的虚拟计算环境的实例,iVCE(Internet based virtual computing environment)for Memory致力于解决广域分布的内存资源的共享与综合利用问题.由于内存资源的特殊性,传统的资源管理方法很难适用.以iVCE for Memor...作为面向互联网资源共享的虚拟计算环境的实例,iVCE(Internet based virtual computing environment)for Memory致力于解决广域分布的内存资源的共享与综合利用问题.由于内存资源的特殊性,传统的资源管理方法很难适用.以iVCE for Memory作为背景,提出一种基于聚类的虚拟计算环境资源聚合方法,有效降低了资源聚合的问题规模;借鉴物理学中的力场和势能理论,建立了实现资源聚合的基本模型和力场-势能模型以及相应的分布式算法;通过基于真实网络拓扑的模拟,对两种模型和算法分别进行了评估和验证.展开更多
基金The National Basic Research 973 Program of China (No2005CB321804)
文摘The initiative of internet-based virtual computing environment(iVCE) aims to provide the end users and applications with a harmonious,trustworthy and transparent integrated computing environment which will facilitate sharing and collaborating of network resources between applications.Trust management is an elementary component for iVCE.The uncertain and dynamic characteristics of iVCE necessitate the requirement for the trust management to be subjective,historical evidence based and context dependent.This paper presents a Bayesian analysis-based trust model,which aims to secure the active agents for selecting appropriate trusted services in iVCE.Simulations are made to analyze the properties of the trust model which show that the subjective prior information influences trust evaluation a lot and the model stimulates positive interactions.
基金supported by the National Natural Science Foundation of China(Nos.61379055 and 61379053)
文摘Internet-based virtual computing environment(iVCE) has been proposed to combine data centers and other kinds of computing resources on the Internet to provide efficient and economical services.Virtual machines(VMs) have been widely used in iVCE to isolate different users/jobs and ensure trustworthiness,but traditionally VMs require a long period of time for booting,which cannot meet the requirement of iVCE's large-scale and highly dynamic applications.To address this problem,in this paper we design and implement VirtMan,a fast booting system for a large number of virtual machines in iVCE.VirtMan uses the Linux Small Computer System Interface(SCSI) target to remotely mount to the source image in a scalable hierarchy,and leverages the homogeneity of a set of VMs to transfer only necessary image data at runtime.We have implemented VirtMan both as a standalone system and for Open Stack.In our 100-server testbed,VirtMan boots up 1000 VMs(with a 15 GB image of Windows Server 2008) on 100 physical servers in less than 120 s,which is three orders of magnitude lower than current public clouds.
基金the National Natural Science Foundation of Chinaunder Grant Nos.6067316790412011(国家自然科学基金)the National Basic Research Program of Chinaunder GrantNo.2005CB321801(国家重点基础研究发展计划(973))
文摘作为面向互联网资源共享的虚拟计算环境的实例,iVCE(Internet based virtual computing environment)for Memory致力于解决广域分布的内存资源的共享与综合利用问题.由于内存资源的特殊性,传统的资源管理方法很难适用.以iVCE for Memory作为背景,提出一种基于聚类的虚拟计算环境资源聚合方法,有效降低了资源聚合的问题规模;借鉴物理学中的力场和势能理论,建立了实现资源聚合的基本模型和力场-势能模型以及相应的分布式算法;通过基于真实网络拓扑的模拟,对两种模型和算法分别进行了评估和验证.
基金the National Natural Science Foundation of China under Grant Nos.60673167 90412011 (国家自然科学基金)the National Basic Research Program of China under Grant No.2005CB321801 (国家重点基础研究发展计划(973))
文摘基于网络资源的"成长性"、"自治性"和"多样性",近年来,人们提出以通用DHT(distributed Hash table)信息服务的形式实现网络资源信息的发布和查询.然而,现有的资源信息服务在通用性、易用性和自适应性等方面仍存在不足.针对虚拟计算环境iVCE(Internet-based virtual computingen vironment)的资源聚合需求,提出构建可扩展的分布式资源信息服务SDIRIS(scalable distributed resource information service).首先,提出采用自适应DHT(adaptive FissionE,简称A-FissionE)底层架构,以对上层应用透明的方式适应不同的系统规模和稳定性;其次,基于自适应DHT提出高效的多属性区间搜索算法(multiple-attribute range FissionE,简称MR-FissionE).理论分析和模拟结果表明,SDIRIS能够高效地实现资源信息的发布与查询功能.
基金the National Natural Science Foundation for Distinguished Young Scholars of China under Grant No.60625203 (国家自然科学基金杰出青年基金)the National Basic Research Program of China under Grant Nos.2005CB321800 2005CB321804 (国家重点基础研究发展计划(973))