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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 ...

引用

International Symposium on Parallel Architectures, Algorithms, and Programming

作者： Tu, Xuping Jin, Hai Jiang, Wenbin Liao, Xiaofei Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769543123

Recently, 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. © 2010 Crown Copyright.

关键词： Social networking (online)

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MT-BTRIMER: A master-slave multi-threaded dynamic binary translator

MT-BTRIMER: A master-slave multi-threaded dynamic binary tra...

引用

International Conference on Frontier of Computer Science and technology

作者： Tu, Xuping Jin, Hai Yu, Zhibin Chen, Jie Hu, Yabin Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769541396

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. © 2010 IEEE.

关键词： Memory architecture

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Vdismodel: A display latency performance model in virtualization environment

Vdismodel: A display latency performance model in virtualiza...

引用

6th International Conference on Semantics, Knowledge and Grid, SKG 2010

作者： Zhou, Bin Jin, Hai Yuan, Pingpeng Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769541891

With the rapid development of virtualization technology as well as the good performance of computer hardware, virtual machine is beginning to gradually increase the performance of display to meet the needs of desktop users. However, there is a difference between the display mechanism in the virtual environment and the traditional environment. At present, more is focused on how to effectively and pertinently measure and assess the performance of display in virtualization environment. Taking consideration of the characteristics of display in the virtual environment, the virtual machine display performance evaluation system has following advantages: it can select a representative workload running on the VM in Domain U, make use of Tracing and Instrumentation to insert the record in the kernel of VM, log the relevant information, and then finally draw the performance-related parameters by the analysis of the recorder. This paper mainly depicts the underlying implementation details of the virtual display system in Xen and analyzes the display principle of Xen-based virtual machine. It also proposes a display latency performance model in Xen environment, which is named Vdismodel by verifying the reasonableness of the Vdismodel through a series of experiments and comparing the theoretical data and the measured data which are accessed by the virtual machine system performance evaluation. © 2010 IEEE.

关键词： Display devices

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XenHVMAcct: Accurate CPU time accounting for hardware-assisted virtual machine

XenHVMAcct: Accurate CPU time accounting for hardware-assist...

引用

11th International Conference on Parallel and Distributed computing, Applications and Technologies, PDCAT 2010

作者： Chen, Huacai Jin, Hai Hu, Kan Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769542874

CPU time accounting is a basis of performance measurement and process scheduling in operating system. Accounting operations are traditionally completed in timer interrupt handler since timer interrupt is periodically delivered to OS. However, when virtualization introduced, the CPU time is shared by multiple virtual CPUs (i.e., VCPU for short) and the virtual timer interrupt is paused for those ones be scheduled out. This makes the time accounting be inaccurate, and we should consider new method for VM to provide a stable and reliable data source, especially for the hardware-assisted virtual machines (i.e., HVM for short) which are not aware of VMM. The key point of accurate CPU time accounting is to distinguish the time allocated to "this VCPU" and "other VCPUs". Para-virtualization (i.e., PV for short) achieves this goal by modifying the timer handling routines. For HVM, we propose an accurate accounting method (named XenHVMAcct) within Xen virtual platform. XenHVMAcct is designed by using the mechanisms of virtual interrupt and loadable kernel module, without direct modifications to guest OS. Experimental results show that our accounting method is as accurate as the PV solution. © 2010 IEEE.

关键词： Virtualization

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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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16th IEEE International Conference on Parallel and Distributed systems, ICPADS 2010

作者： Zhang, Minjia Jin, Hai Shi, Xuanhua Wu, Song Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769543079

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. © 2010 IEEE.

关键词： Fault tolerance

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Meld: A real-time message logic debugging system for distributed systems

Meld: A real-time message logic debugging system for distrib...

引用

2010 IEEE Asia-Pacific services computing Conference, APSCC 2010

作者： Tu, Xuping Jin, Hai Fan, Xuepeng Ye, Jiang Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769543055

The largest difference between a distributed and a non-distributed system is that the former introduces network messages to the system. Network messages bring the scalability to a distributed system as well as complexity to it. Testing large-scale distributed systems is a great challenge, because some errors happen after a distributed sequence of events that involves machine and network failures. Meld is a checker that allows developers to specify expected message logic on a deployed distributed system, and that verifies these logics while the system is running. When Meld finds a problem it starts collecting more information that led to the problem, allowing developers to quickly find the root cause. Developers write message logics on Meld and Meld verifies them through analyzing the collected abstract of messages. By using binary instrumentation, Meld works almost transparently with debugged systems and can change logics to be checked at runtime. An evaluation with a deployed system shows that Meld can detect non-trivial correctness at runtime. © 2010 IEEE.

关键词： Program debugging

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Adaptive audio-aware scheduling in Xen virtual environment

Adaptive audio-aware scheduling in Xen virtual environment

引用

2010 ACS/IEEE International Conference on Computer systems and Applications, AICCSA 2010

作者： Chen, Huacai Jin, Hai Hu, Kan Yuan, Minhao Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424477159

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： Virtual reality

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Benchmark object for virtual machines

Benchmark object for virtual machines

引用

2nd International Workshop on Education technology and Computer Science, ETCS 2010

作者： Xie, Xia Chen, Qingcha Cao, Wenzhi Yuan, Pingpeng 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)9780769539874

The most cost effective approach to study the performance of virtualization technology is to use the benchmark. In this paper, we present a new evaluation methodology to deploy a benchmark evaluation with a Benchmark Object. By encapsulating three steps of traditional benchmark processes and implementing an instance from a Benchmark Object, users need not evaluate manually. Furthermore, a Benchmark Object simplifies the use of benchmarks and saves a great deal of duplicate work to deploy, configure and execute benchmarks and analyze their results. We develop the virtualization system performance evaluation management facility to implement and manage the concept of a Benchmark Object. We discuss this performance evaluation tool in detail, test the performance of the tool, and draw some conclusions. © 2010 IEEE.

关键词： Virtual machine

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XenMVM: Exploring potential performance of multi-core system in virtual machine environment

XenMVM: Exploring potential performance of multi-core system...

引用

International Conference on Ubiquitous Information Technologies and Applications

作者： Shao, Zhiyuan Huang, Jian Jin, Hai Hu, Kan Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424488124

In this work, we propose computing resource management system based on Xen VMM and multi-core system, called XenMVM. It adjusts the computing resource dynamically according to the actual workload generated by the applications running in the virtual machine to improve the resource utilization of the computer system. According to the shared L2 cache architecture of multi-core system, we propose the Underlying Layout Aware Scheduling (ULAS) which can schedule the virtual CPUs of virtual machines to the appropriate physical CPUs. The test result shows that ULAS can improve the performance about 4.5%-32.52%. Furthermore, to improve the whole performance of multiple virtual machines and meet the needs of specific jobs (i.e., urgent and I/O intensive) deployed in the virtual machines, a simplified method called Domain-based static priority is adopted in XenMVM. Using case studies we show that our proposal reduces the turnover time of the whole system by 20.45% compared with FCFS scheduling scheme. ©2010 IEEE.

关键词： Virtual machine

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MISM: Modelica-based interactive scheduling mechanism for virtual educational experiments

MISM: Modelica-based interactive scheduling mechanism for vi...

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5th Annual ChinaGrid Conference, ChinaGrid 2010

作者： Jiang, Wenbin Tang, Zhen Jin, Hai Liu, Chao Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769541068

Different virtual educational experiments (VEEs) have different frameworks and implementations in different disciplines. How to integrate different VEEs into one unified supporting platform is a challenging problem. The key problem of this integration is how to build a unified mathematical model for VEEs of diversified disciplines. However, most existing multi-domain uniform modeling (MDUM) approaches such as Modelica are research-oriented and lack of real time interaction, which does not meet the requirement of virtual experiments that are user-oriented and highly interactive. To tackle above problem, a Modelica-based interactive scheduling mechanism (MISM) for VEE is proposed. In MISM, user-oriented interaction is based on a best step length algorithm and an interactive event step algorithm. The throughput is considered in the former and the real time interaction is resolved by the latter. Experimental results shows that the approaches presented can meet the requirements of VEEs efficiently. © 2010 IEEE.

关键词： Scheduling

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