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A Cloud Service Cache system Based on Memory Template of Virtual Machine

A Cloud Service Cache System Based on Memory Template of Vir...

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ChinaGrid Annual Conference (ChinaGrid)

作者： Xuanhua Shi Chao Liu Song Wu Hai Jin Xiaoxin Wu Li Deng Services Computing Technology and System Laboratory Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Huawei Technologies Company Limited China

In data centers and cloud computing environments, the number of virtual machines (VMs) increases when the number of service requests increases. Since services are invoked on demand, the corresponding virtual machines will be created and shut down frequently. This makes the time of starting a virtual machine a crucial performance bottleneck for services in data centers. Besides, if virtual machines read image files from disks to start themselves, additional overhead to access disk will be generated. In this paper, we present a cloud service cache system based on memory template of virtual machines - VCache to improve the response time of cloud computing services, and to reduce the disk access overhead. This system can create and maintain service cache VMs through memory templates, which are snapshots of running virtual machines. By creating virtual machines from cached image files, the service running in these VMs can be deployed rapidly, which greatly reduces the launching time of the service and disk I/O load. We evaluate our system with experiments, and the experimental results show that the average time for creating a VM is reduced about 80% and the amount of data through disk access decreases more than 50%.

关键词： Virtual machining Random access memory IP networks Memory management Image restoration Cloud computing Cloning

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高可扩展的RDF数据存储系统

高可扩展的RDF数据存储系统

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第29届中国数据库学术会议

作者： Yuan Pingpeng 袁平鹏 Liu Pu 刘谱 Zhang Wenya 张文娅 Wu Buwen 吴步文 Key Laboratory of Services Computing Technology and System(Huazhong University of Science and Technology) Ministry of Education Wuhan 430074 服务计算技术与系统教育部重点实验室(华中科技大学) 武汉430074 Key Laboratory of Cluster and Grid Computing of Hubei Province(Huazhong University of Science and Technology)Wuhan 430074 集群与网格计算湖北省重点实验室(华中科技大学) 武汉430074 School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 华中科技大学计算机科学与技术学院武汉430074

由于资源描述框架(resource description framework,RDF)具有表达灵活、简洁等优点,已被接受为表达元数据及万维网上数据互联的规范.近年来,其数据量在以飞快的速度增长.相应地,要求存储RDF数据的系统应具有高扩展性.介绍了一个高可扩展... 详细信息

由于资源描述框架(resource description framework,RDF)具有表达灵活、简洁等优点,已被接受为表达元数据及万维网上数据互联的规范.近年来,其数据量在以飞快的速度增长.相应地,要求存储RDF数据的系统应具有高扩展性.介绍了一个高可扩展的RDF数据存储系统TripleBit.为尽可能降低存储空间消耗,采用了增量压缩和变长整数编码方法.并采用了数据分块的存储方法,既使得存储管理方便又使得存储结构紧凑,加速了数据读取.系统提供了基于启发式规则的动态查询计划生成方法,所产生的查询计划在执行过程中根据中间结果会相应作调整,以保持最优的执行顺序.对于多变量的查询,使用二步执行策略以减少查询过程中产生的中间结果.与目前流行RDF数据存储系统相比较,在存储空间上RDF-3X比TripleBit至少多40％；在查询性能上,比RDF-3X和MonetDB获得数倍的提升.

关键词：数据存储系统资源描述框架数据编码查询处理

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大规模RDF数据库系统TripleBit

大规模RDF数据库系统TripleBit

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第29届中国数据库学术会议

作者： Liu Pu 刘谱 Wang Jing 王晶 Yuan Pingpen 袁平鹏 Wu Buwen 吴步文 Key Laboratoty of Services Computing Technology and System (Huazhong University of Science and Technology) Ministry of Education Wuhan 430074 服务计算技术与系统教育部重点实验室(华中科技大学) 武汉430074 Key Laboratory of Cluster and Grid Computing of Hubei Province(Huazhong University of Science and Technology)Wuhan 430074 集群与网格计算湖北省重点实验室(华中科技大学) 武汉430074 School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 华中科技大学计算机科学与技术学院武汉430074

由于RDF(Resource Description Framework)具有表达灵活、简洁等优点,已被接受为表达元数据及万维网上数据互联的规范。近年来,其数据量以飞快的速度增长,相应地,要求存储RDF数据的系统应具有高扩展性。大规模RDF数据库系统TripleBit旨... 详细信息

由于RDF(Resource Description Framework)具有表达灵活、简洁等优点,已被接受为表达元数据及万维网上数据互联的规范。近年来,其数据量以飞快的速度增长,相应地,要求存储RDF数据的系统应具有高扩展性。大规模RDF数据库系统TripleBit旨在为大规模RDF数据提供一个高效的存储和查询方案。为尽可能降低存储空间消耗,采用了增量压缩和变长整数编码方法。并采用了数据分块的存储方法,既使得存储管理方便又使得存储结构紧凑,加速了数据读取。系统提供了基于启发式规则的动态查询计划生成方法。所产生的查询计划在执行过程中根据中间结果会相应作调整,以保持最优的执行顺序。对于多变量的查询,使用二步执行策略以减少查询过程中产生的中间结果。与当前著名系统RDF-3X相比,TripleBit具有较好的性能。

关键词：资源描述框架数据库系统优化设计应用框架查询处理

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Xenrelay: An Efficient Data Transmitting Approach for Tracing Guest Domain

Xenrelay: An Efficient Data Transmitting Approach for Tracin...

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IEEE International Conference on Cloud computing technology and Science (CloudCom)

作者： Hai Jin Wenzhi Cao Pingpeng Yuan Xia Xie Cluster and Grid Computing Laboratory Services Computing Technique and System Laboratory Huazhong University of Science and Technology Wuhan China

As the degree of virtualization is growing considerably, improving performance of virtual machine environments motivates deeper investigation of the internal processes and performance implications of virtualization. Several tools are currently available to help analyze performance in virtual machine environments. However, all of these cannot support users to add their own trace information. In this paper, we present Xenrelay, a unified, efficient, and simple mechanism for transferring large amounts of data from guest domain kernel to privileged domain user-space. Xenrelay allows users (who trace subsystems of guest domain to analyze performance) to record and fast relay data between domains. We provide a case of Xenrelay's value in revealing behavior of virtualization. We build a block trace toolkit (using Xenrelay as an engine). This toolkit is used to track the block I/O virtualization procedures and evaluates overheads in the Xen environment. Our trace results identify that the main delay is the time of request transmission and block device operation. Besides, the results reveal impact of the I/O schedules on the disk performance.

关键词： Relays Kernel Bandwidth Data communication Virtual machining Performance evaluation Engines

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Adaptive audio-aware scheduling in Xen virtual environment

Adaptive audio-aware scheduling in Xen virtual environment

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IEEE/ACS International Conference on Computer systems and Applications

作者： Huacai Chen Hai Jin Kan Hu Minhao Yuan Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

With the development of client virtualization technology, it has become an important tendency to apply soft real-time applications in virtual environment. Currently, most schedulers in VMM (i.e., virtual machine monitor) take the fairly sharing of processor resources and load balancing as a main concern, while show less regard to application diversity and I/O responsiveness. This would be unable to meet the requirement for latency-sensitive tasks, such as audio application. Audio stream may suffer from severe input buffer overrun or output buffer underrun, especially in the case that there is no real-time guarantee on virtualized clients under heavy load. In this paper, we introduce experiments to illustrate that current scheduler in Xen does a poor job in guaranteeing fluent audio playing, and then formulate the fluent playing conditions a scheduler should satisfy. A scheduling strategy with soft real-time support is proposed to improve the responsiveness of latency-sensitive guests. To implement our proposition, we extend the Credit scheduler by using flexible time slice and real-time priority. Our solution is audio-aware and capable of adjusting the real-time priority of guest domains adaptively, achieving a better experience for end-users. The experimental results show that audio glitches can be completely eliminated via our extended scheduler even when the system load is very high.

关键词： Client virtualization flexible time slice latency-sensitive real-time priority

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VirtCFT: A Transparent VM-Level Fault-Tolerant system for Virtual Clusters

VirtCFT: A Transparent VM-Level Fault-Tolerant System for Vi...

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International Conference on Parallel and Distributed systems (ICPADS)

作者： Minjia Zhang Hai Jin Xuanhua Shi Song Wu Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

A virtual cluster consists of a multitude of virtual machines and software components that are doomed to fail eventually. In many environments, such failures can result in unanticipated, potentially devastating failure behavior and in service unavailability. The ability of failover is essential to the virtual cluster's availability, reliability, and manageability. Most of the existing methods have several common disadvantages: requiring modifications to the target processes or their OSes, which is usually error prone and sometimes impractical; only targeting at taking checkpoints of processes, not whole entire OS images, which limits the areas to be applied. In this paper we present VirtCFT, an innovative and practical system of fault tolerance for virtual cluster. VirtCFT is a system-level, coordinated distributed checkpointing fault tolerant system. It coordinates the distributed VMs to periodically reach the globally consistent state and take the checkpoint of the whole virtual cluster including states of CPU, memory, disk of each VM as well as the network communications. When faults occur, VirtCFT will automatically recover the entire virtual cluster to the correct state within a few seconds and keep it running. Superior to all the existing fault tolerance mechanisms, VirtCFT provides a simpler and totally transparent fault tolerant platform that allows existing, unmodified software and operating system (version unawareness) to be protected from the failure of the physical machine on which it runs. We have implemented this system based on the Xen virtualization platform. Our experiments with real-world benchmarks demonstrate the effectiveness and correctness of VirtCFT.

关键词： Virtual machining Fault tolerant systems Fault tolerance Checkpointing Protocols Kernel

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Dynamic Switching-Frequency Scaling: Scheduling Overcommitted Domains in Xen VMM

Dynamic Switching-Frequency Scaling: Scheduling Overcommitte...

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International Conference on Parallel Processing (ICPP)

作者： Huacai Chen Hai Jin Kan Hu Jian Huang Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

Virtualization enables multiple guest operating systems run on a single physical platform. These virtual machines may host any types of application, including concurrent HPC programs. Traditionally, VMM schedulers have focused on fairly sharing the processor resources among domains, rarely consider VCPUs' behaviors. However, this can result in poor application performance to overcommitted domains if there are concurrent programs hosted in them. In this paper we review the properties of both Xen's Credit and SEDF schedulers, and show how these schedulers may seriously impact the performance of the communication-intensive and I/O-intensive concurrent applications in overcommitted domains. We discuss the origination of the problem theoretically, and confirm the derived conclusion on benchmarks. A novel approach, that dynamically scales the context switching-frequency by selecting variable time slices according to VCPUs` behaviors, is then proposed to improve the Credit scheduler more adaptive for concurrent applications. The experimental results show that this extended Credit scheduler can improve the performance of communication-intensive and I/O-intensive concurrent applications in overcommitted domains to the same magnitude as in undercommitted domains.

关键词： Switches Context Dynamic scheduling Monitoring Dispersion Instruction sets Hardware

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FTDS: Adjusting Virtual computing Resources in Threshing Cases

FTDS: Adjusting Virtual Computing Resources in Threshing Cas...

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： Jian Huang Hai Jin Kan Hu Zhiyuan Shao Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

In a virtual execution environment, dynamic computing resource adjustment technique, configuring the computing resource of virtual machines automatically according to the actual loads generated by applications, is often adopted in virtual machine monitor to improve the resource utilization rate. Traditionally, the simple Additive Increase Subtractive Decrease (AISD) scheme is used as an adjusting rule. However, in some special situations, for example, compiling kernel in a virtual machine, the configuration of virtual machines may change abruptly because of the violent vibration of workload during a short interval, and the threshing can inevitably result in additional overhead under AISD rule. In this paper, we extend the Proportional-Integral-Derivative (PID) algorithm and present a feedback control model for configuring virtual computing resources, and propose an innovative adjusting scheme called Forecasting and Time Delayed Subtraction (FTDS) to reduce the overhead caused by threshing. The FTDS uses both statistic history of resource requests and current utilization of computing resource to predict whether threshing happens and to determine how many and when to adjust the amount of virtual CPUs. Experimental results show that FTDS can effectively reduce the jitter occurred in adjusting and make the performance penalty for threshing decreased from 9% to 0.3% compared with AISD, while maintaining that in non-threshing cases the same as AISD.

关键词： Virtual machining Virtual machine monitors Resource management Kernel Three-term control Feedback control Predictive models Delay effects Statistics History

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Measurement Study of PKTown: A P2P-Based Multiplayer Online Game Supporting system

Measurement Study of PKTown: A P2P-Based Multiplayer Online ...

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International Symposium on Parallel Architectures, Algorithms and Programming (PAAP)

作者： Xuping Tu Hai Jin Wenbin Jiang Xiaofei Liao Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

Multiplayer Online Game has been extremely popular, in which peer-to-peer technology has been introduced to help with the scaling. This paper presents a measurement study on a P2P-based MOG supporting system, called PKTown, which has been fully deployed over the CERNET. By leveraging a large set of traces obtained recently over a 4-month period, we study the benefit of P2P architecture applying to MOG supporting system, workload characteristics, players' behaviors and impact form a number of system parameters. We believe this provides insights in understanding the fundamental nature of MOG, which can be further explored to enhance the system design.

关键词： Games Servers Relays Correlation Bandwidth Peer to peer computing Computer architecture

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MT-BTRIMER: A Master-Slave Multi-threaded Dynamic Binary Translator

MT-BTRIMER: A Master-Slave Multi-threaded Dynamic Binary Tra...

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Japan-China Joint Workshop on Frontier of Computer Science and technology (FCST)

作者： Xuping Tu Hai Jin Zhibin Yu Jie Chen Yabin Hu Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

Most of the current dynamic binary translation (DBT) systems are single-threaded and many orders of magnitude slower than native execution. Although multi-core processors are becoming more and more prevalent, the single-threaded architecture prevents these DBT systems from improving their performance by making full use of the parallel execution advantage. In this paper, we present the design and implementation of a multi-threaded DBT system, named MT-BTRIMER. MT-BTRIMER employs a master-slave multi-threaded architecture. We evaluate the MT-BTRIMER system across SPEC CINT 2000 and BYTEmark test suite. The results demonstrate that MT-BTRIMER can speculatively translate on average 60% of useful target code, and reduce the total runtime by nearly 30% compared with ST-BTRIMER which is a single-threaded DBT system.

关键词： Instruction sets Message systems Runtime Benchmark testing Scalability Context Synchronization

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