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Towards scalab.e middleware for multiplayer online games

Towards scalable middleware for multiplayer online games

引用

5th Annual ChinaGrid Conference, ChinaGrid 2010

作者： Tu, Xuping Wu, Lei Zheng, Long Jin, Hai Jiang, Wenbing Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China School of Computer Science and Engineering University of Aizu Aizu-Wakamatsu City 985-8580 Japan

ISBN: (纸本)9780769541068

Warcraft III is one of the most popular Multiplayer Online Game (MOG) games, where users are designed to interact with support of a dedicated server. PKTown is a P2P-based third-party middleware developed to replace the dedicated servers. This paper presents the scalab.lity and robustness of PKTown 2.0 architecture. The evaluation demonstrates the efficiency of the architecture. © 2010 IEEE.

关键词： Middleware

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Workshop on coupled display visual interfaces 10

Workshop on coupled display visual interfaces

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Proceedings of the International Conference on Advanced Visual Interfaces

作者： Dix, Alan Subramanian, Sriram Quigley, Aaron Terrenghi, Lucia Lancaster University Computing Department InfoLab. 21 South Drive Lancaster LA1 4WA United Kingdom University of Bristol Department of Computer Science Bristol BS8 1UB United Kingdom University of Tasmania Human Interface Technology Lab. Australia School of Computing and Information Systems Launceston TAS 7250 Australia Vodafone Group Services R and D Chiemgaustrasse 116 81549 Munchen Germany

ISBN: (纸本)9781450300766

Interactive displays are increasingly distributed in a broad spectrum of everyday life environments: They have very diverse form factors and portability characteristics, support a variety of interaction techniques, and can be used by a variable number of people. The coupling of multiple displays can thus create interactive "ecosystems" which mingle in the social context, and generate novel settings of communication, performance and ownership. The objective of this workshop is to focus on the range of research challenges and opportunities afforded by applications that rely on visual interfaces that can spread across multiple displays. Such displays are physically decoupled (i.e. connected to multiple computers) yet are visually coupled due to the interfaces and interactions they support. This can range from visual interfaces spread across multiple small private input displays (e.g. information exchange or game play) to small private displays coupled with larger public displays (e.g. public photo sharing). © 2010 ACM.

关键词： Ubiquitous computing

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VMDriver: A Driver-Based Monitoring Mechanism for Virtualization

VMDriver: A Driver-Based Monitoring Mechanism for Virtualiza...

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Reliable Distributed systems

作者： Guofu Xiang Hai Jin Deqing Zou Xinwen Zhang Sha Wen Feng Zhao Cluster and Grid Computing Laboratory Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan China Samsung Information Systems America Inc. San Jose CA USA

Monitoring virtual machine (VM) is an essential function for virtualized platforms. Existing solutions are either coarse-grained - monitoring in granularity of VM level, or not general - only support specific monitoring functions for particular guest operating system (OS). Thus they do not satisfy the monitoring requirement in large-scale server cluster such as data center and public cloud platform, where each physical platform runs hundreds of VMs with different guest OSes. In this paper, we propose VMDriver, a general and fine-grained approach for virtualization monitoring. The novel design of VMDriver is the separation of event interception point in VMM level and rich guest OS semantic reconstructions in management domain. With this design, variant monitoring drivers in management domain can mask the differences of guest OSes. We implement VMDriver on Xen and our experimental study shows that it introduces very small performance overhead. We demonstrate its generality by inspecting four aspects information about the target virtual machines with different guest OSes. The unified interface of VMDriver brings convenience to develop complex monitoring tools for distributed virtualization environment.

关键词： Monitoring Driver circuits Semantics Linux Kernel Malware

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Agent-based data loading method in medlmgrid

Agent-based data loading method in medlmgrid

引用

2009 International Conference on New Trends in Information and Service Science, NISS 2009

作者： Zheng, Ran Jin, Hai Zhang, Qin Liu, Xin Services Computing Technology and System Lab. Cluster and Grid Computing Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769536873

Agent-based grid data loading method aims at integrating heterogeneous hospitals' information systems into a medical information exchange platform based on grid middleware. It collects distributed data sets for decision support system, which makes data sources expanded from independent database modes to medical information systems in wide area. Virtual data access with grid service improves data security and makes data modification in local system more flexible. HL7 protocol and middleware are utilized to transform HL7 data into various local data structures for keeping the independence of each hospital information system and providing more convenience and expansibility for various medical applications. © 2009 IEEE.

关键词： Medical applications

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Fast isosurface extraction for medical volume dataset on cell BE

Fast isosurface extraction for medical volume dataset on cel...

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38th International Conference on Parallel Processing, ICPP-2009

作者： Jin, Hai Li, Bo Zheng, Ran Zhang, Qin Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769538020

The size of volumetric data generated by medical imaging and scientific simulations is increased significantly due to the dramatic advances in medical imaging modalities and computing technologies. The volumetric data generally need to be visualized and Marching Cubes algorithm (MC for short) is one of the standard methods of the isosurface extraction for the medical applications. However, MC algorithm requires a large amount of data computing power. The Cell Broadband Engine (Cell for short) processor, which is a typical COTS (commodity off-the-shelf) heterogeneous designed to handle extremely demanding computations, can be used to hasten isosurface extraction in medial application. In this paper, we present a streaming model-based scheme to efficiently map MC algorithm to Cell. Specifically, a blockbased filter running on PPE is imposed as a preprocessing stage to avoid unnecessary data transfer and computation, and the MC kernel runs on SPEs as the subsequent stage. Through tuning the size of the block, the workload of PPE and SPE is orchestrated harmoniously. The experimental results demonstrate that overall isosurface extraction speedup of more than 10 times is achieved compared with conventional heavy iron CPUs. © 2009 IEEE.

关键词： Cells

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Live migration of virtual machine based on full system trace and replay 09

Live migration of virtual machine based on full system trace...

引用

18th ACM International Symposium on High Performance Distributed computing, HPDC 09, Co-located with the 2009 International Symposium on High Performance Distributed computing Conference, HPDC'09

作者： Haikun, Liu Hai, Jin Xiaofei, Liao Liting, Hu Chen, Yu Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781605585871

Live migration of virtual machines (VM) across distinct physical hosts provides a significant new benefit for administrators of data centers and clusters. Previous migration schemes focused on transferring the run-time memory state of the VM. Those approaches employed memory pre-copy algorithm to synchronize the migrating VM states, which make VM live migration cost much network traffic and application downtime, especially for memory-intensive workloads. This paper describes the design and implementation of a novel approach CR/TR-Motion that adopts checkpointing/recovery and trace/replay technology to provide fast, transparent VM migration. With execution trace logged on the source host, a synchronization algorithm is performed to orchestrate the running source and target VM until they get a consistent state. We also give a formalized characterization about the migration evaluation metrics and make a mathematical analysis about our algorithm. Our scheme can greatly reduce the migration downtime and network bandwidth consumption. Experimental measurements show that our approach can drastically reduce migration overheads compared with pre-copy algorithm: up to 72.4% on application observed downtime, up to 31.5% on total migration time and up to 95.9% on the data to synchronize the VM state, while the application performance overhead due to migration is less than 8.54% on average. Copyright 2009 ACM.

关键词： Virtual machine

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DVM-MAC: A mandatory access control system in distributed virtual computing environment

DVM-MAC: A mandatory access control system in distributed vi...

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15th International Conference on Parallel and Distributed systems, ICPADS '09

作者： Zou, Deqing Shi, Lei Jin, Hai Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769539003

We design and implement a Mandatory Access Control (MAC) system in distributed virtual computing environment, named DVM-MAC, aiming to provide distributed trust through enforcing MAC policies. In DVM-MAC, Prioritized Chinese Wall (PCW) model is implemented to control potential covert channels between VMs in both single node and distributed environment. A policy enforcement module locates inside Xen VMM for better enforcing MAC locally rather than outside the VMM. DVM-MAC adopts centralized architecture for multi-level management and secure transmission of internode policy information. For performance consideration, a specific policy decision and enforcement module for controlling inter-node behaviors is moved out of Xen VMM and up to user space. DVM-MAC authorizes a specific center node named Central Security Server (CSS) to be responsible for the decision making between the nodes as well as leaves the internode policy enforcement module in each node. Through our experiments and data analysis, we verify the correctness, effectiveness, and efficiency in our prototype when implementing PCW model. © 2009 IEEE.

关键词： Decision making

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VRFPS: A novel virtual machine-based real-time file protection system

VRFPS: A novel virtual machine-based real-time file protecti...

引用

7th ACIS International Conference on Software Engineering Research, Management and Applications, SERA09

作者： Zhao, Feng Jiang, Yali Xiang, Guofu Jin, Hai Jiang, Wenbin Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769539034

With the development of virtualization technology, file protection in virtual machine, especially in guest OS, becomes more and more important. Traditional host-based file protection system resides the critical modules in monitored system, which is easily explored and destroyed by malwares. Moreover, in order to protect the multiple operation systems running on the same platform, it is necessary to install independent file protection system for each of them, which greatly wastes computing resources and brings serious performance overhead. In this paper, a novel VM-based realtime file protection system, named VRFPS, is proposed to solve these problems. First, virtual machine monitor introspects all file operations of guest OS. Then, semantic gap between disk block and logic files is narrowed by blktap. Finally, a virtual sandbox is implemented in privileged domain to prevent protected files in guest domain from modifying illegally. Our approach is highly isolated, transparent and without modification on virtual machine monitor and guest OS. The experimental results show that the presented system is validate and of low performance overhead. © 2009 IEEE.

关键词： Virtual machine

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An optimization approach for QEMU

An optimization approach for QEMU

引用

1st International Conference on Information Science and Engineering, ICISE2009

作者： Hu, Yabin Jin, Hai Yu, Zhibin Zheng, Hongyang Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769538877

Binary translation system usually maps guest registers into host registers to accelerate the translation speed. QEMU can be treated as a typical binary translator and it uses a fixed register allocation. On most hosts, QEMU simply maps all the target registers to memory and only store a few temporary variables in host registers. However, QEMU does not consider the dependence of two or more adjacent instructions. So even a guest register's value has been loaded into the temporary variables when executing the previous instruction, the next instruction could not use the value from the temporary variable directly, which is mapped into host register. The next instruction has to reload the value from memory again. This paper presents an approach to eliminate these unnecessary operations. Tests of benchmarks from nbench show that this approach can achieve 10%-20% speed improvement. ©2009 IEEE.

关键词： Binary translation Dynamic compilation Register allocation

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ClientVisor: Leverage COTS OS functionalities for power management in virtualized desktop environment

ClientVisor: Leverage COTS OS functionalities for power mana...

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作者： Chen, Huacai Jin, Hai Shao, Zhiyuan Hu, Kan Yu, Ke Tian, Kun Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China Intel Corporation Shanghai 200241 China

As an emerging trend, virtualization is more and more widely used in today's computing world. But, the introduction of virtual machines bring trouble for the power management (PM for short), since the operating system can not directly access and control the hardware as before. Solutions were proposed to manage the power in the server consolidation case. However, such solutions are VMM-centric: the VMM gathers the PM decisions of the guests as hints, and makes the final decision to manipulate the hardware. These solutions do not fit well for the virtualized desktop environment, which is highly interactive with the users. In this paper, we propose a novel solution, called ClientVisor, to manage the power in the virtualized desktop environment. The key idea of our scheme is to leverage the functionalities of the Commercial-Off-The-Shelf (COTS) operating system, which actually interacts with the user, to manage the power of the processor and the peripheral devices in all possible cases. VMM coordinates the PM decisions of the guests only at the key points. By prototype implementation and experiments, we find our scheme results in 22% lower power consumption in the static power usage scenario, and about 8% lower in the dynamic scenario than the corresponding cases of Xen. Moreover, the experimental data shows that the deployment of our scheme will not deteriorate the user experience. © ACM, 2009.

关键词： Virtual machine

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