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共 241 条记录，以下是91-100 订阅

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Machine Learning is All You Need: A Simple Token-Based Approach for Effective Code Clone Detection 24

Machine Learning is All You Need: A Simple Token-Based Appro...

引用

44th ACM/IEEE International Conference on Software Engineering, ICSE 2024

作者： Feng, Siyue Suo, Wenqi Wu, Yueming Zou, Deqing Liu, Yang Jin, Hai Huazhong University of Science and Technology China Nanyang Technological University Singapore Hubei Engineering Research Center on Big Data Security Cluster and Grid Computing Lab National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Hubei Key Laboratory of Distributed System Security China Jinyinhu Laboratory Wuhan430074 China School of Cyber Science and Engineering Hust Wuhan430074 China School of Computer Science and Technology Hust Wuhan430074 China

ISBN: (纸本)9798400702174

As software engineering advances and the code demand rises, the prevalence of code clones has increased. This phenomenon poses risks like vulnerability propagation, underscoring the growing importance of code clone detection techniques. While numerous code clone detection methods have been proposed, they often fall short in real-world code environments. They either struggle to identify code clones effectively or demand substantial time and computational resources to handle complex clones. This paper introduces a code clone detection method namely Toma using tokens and machine learning. Specifically, we extract token type sequences and employ six similarity calculation methods to generate feature vectors. These vectors are then input into a trained machine learning model for classification. To evaluate the effectiveness and scalability of Toma, we conduct experiments on the widely used BigCloneBench dataset. Results show that our tool outperforms token-based code clone detectors and most tree-based clone detectors, demonstrating high effectiveness and significant time savings. © 2024 ACM.

关键词： Machine learning

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Building an automated trust negotiation system

Building an automated trust negotiation system

引用

International Conference on Information, Communications and Signal Processing

作者： Hai Jin Zhensong Liao Deqing Zou Chisong Li 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

ISBN: (纸本)9781424409822;1424409829

Automated trust negotiation (ATN) is an important means to establish trust between strangers through the exchange of digital credentials and mobile access control policies specifying what combinations of credentials a stranger must submit. While ATN provides a good mechanism to share resources in the distributed environments, there still exist some problems in ATN. A notable issue is that it is difficult to build a practical system. And no guidance is given on how to realize an ATN system. Previous work focused on presenting trust negotiation models or schemes, and most work aimed at protecting privacy and preventing sensitive information from leaking. In this paper, we pay much attention on how to build an ATN system, and design and implement a toy ATN system. We present a new means to implement access control policy, digital credential and its matching. A use case is studied to prove the toy system is sound and reasonable.

关键词： Access control Protocols Protection Grid computing Computer science Mobile computing Privacy Authentication Authorization LAN interconnection

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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...

引用

International Conference on Parallel and Distributed systems (ICPADS)

作者： Deqing Zou Lei Shi Hai Jin 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

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 inter-node 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 inter-node 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.

关键词： Access control Distributed computing Voice mail Virtual manufacturing Virtual machining Hardware Grid computing Operating systems Concurrent computing Resource virtualization

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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 (ICUT)

作者： Zhiyuan Shao Jian Huang Hai Jin Kan 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

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.

关键词： Virtual machining Processor scheduling Program processors Multicore processing Scheduling Resource management

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Dynamic Processor Resource Configuration in Virtualized Environments

Dynamic Processor Resource Configuration in Virtualized Envi...

引用

IEEE International Conference on services computing (SCC)

作者： Hai Jin Li Deng Song Wu Xuanhua Shi 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 can provide significant benefits in data centers, such as dynamic resource configuration, live virtual machine migration. services are deployed in virtual machines (VMs) and resource utilization can be greatly improved. In this paper, we present VScheduler, a system that dynamically adjusts processor resource configuration of virtual machines, including the amount of virtual resource and a new mapping of virtual machines and physical nodes. VScheduler implements a two-level resource configuration scheme -- local resource configuration (LRC) for an individual virtual machine and global resource configuration (GRC) for a whole cluster or data center. GRC especially takes variation tendency of workloads into account when remapping virtual machines to physical nodes. We implement our techniques in Xen and conduct a detailed evaluation using RUBiS and dbench. The experimental results show that VScheduler not only satisfies resource demands of services, but also reduces the number of virtual machines migration, which can provide a stable VM distribution on physical nodes in data centers.

关键词： Virtual machining Resource management Dynamic scheduling Servers Hardware Benchmark testing Computer architecture

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Fast saving and restoring virtual machines with page compression

Fast saving and restoring virtual machines with page compres...

引用

International Conference on Cloud and Service computing (CSC)

作者： Li Deng Hai Jin Song Wu Xuanhua Shi Jiangfu Zhou 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

More and more enterprises are moving beyond server virtualization to desktop virtualization in recent years. In virtualization environments, centralized shared storage systems are generally used to take advantage of virtualization features such as VM migration. Network file system (NFS) is considered to be the best choice in small or medium sized LANs due to its flexibility and low cost. But it becomes the bottleneck when many clients access the server simultaneously, especially when multiple virtual machines access a large amount of data at the same time, such as operation save and restore. In this paper, we present a new method named ComIO to quickly save and restore virtual machines using page compression. Based on the analysis of virtual machines' memory characteristics, we design a fast enhanced characteristic-based compression (ECBC) algorithm. Combined with multi-threaded techniques, the compression tasks are parallelized for significantly shortened compresssion time. Page boundary alignment is proposed to enable wanted page data to be directly extracted from the compressed block. The experimental results demonstrate that compared with Xen, our method ComIO not only greatly reduces the time spent on saving and restoring virtual machines on average, but also indirectly augments the effective storage space.

关键词： Virtual machining Image coding Instruction sets Compression algorithms Servers Image restoration Algorithm design and analysis

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A performance study of web server based on Hardware-assisted Virtual Machine

A performance study of web server based on Hardware-assisted...

引用

ACS/IEEE International Conference on Computer systems and Applications

作者： Zhiyuan Shao Hai Jin De Zhang 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 resurgence of virtual machine technology, vendors build virtualization technology support in the processors. Virtual machines relying on such support are called Hardware-assisted Virtual Machines (HVM guests for short). Although HVM guests have the advantage that they do not need to revise the source code of operating systems running inside, the processing of I/O operations in HVM is much complicated and the performance of such operations are rather low. In this paper, we conduct a performance study on the Web server running inside the HVM guests by using queuing network modeling technique, and analyze the performance bottlenecks of the systems.

关键词： Web server Virtual machining Hardware Virtual machine monitors Operating systems Performance analysis Predictive models Queueing analysis Application virtualization Application software

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Scheduling and dropping policies for probabilistic routing in Delay Tolerant Networks

Scheduling and dropping policies for probabilistic routing i...

引用

International Conference on Pervasive computing and Applications (ICPCA)

作者： Chen Yu Chuanming Liang Xi Li Hai Jin 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

ISBN: (纸本)9781457702099

The Delay Tolerant Network employs a store-carry-forward paradigm to enable bundle delivery in intermittent connected environments. A router relays a message only when a proper contact opportunity occurs, which results in prominent congestion issues. An appropriate scheduling and dropping policy can alleviate this situation and maximize contact capacity. We investigate the impact of delivery probability and number of message replicas over the efficiency of scheduling and dropping policies in probabilistic routing, and present a new way to utilize contact probability and delivery predictability to direct the design of scheduling policies. We also design a simple and distributed method to approximate the global number of replicas. We integrate these results and present a new scheduling and dropping policy. Simulation based on map based movement has shown that the new policy gains a delivery rate very close to global knowledge based policies, and it outperforms all other existing scheduling and dropping policies.

关键词： Frequency modulation

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A comprehensive monitoring framework for virtual computing environment

A comprehensive monitoring framework for virtual computing e...

引用

International Conference on Information Networking

作者： Guofu Xiang Hai Jin Deqing Zou 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 can divide or aggregate the underlying resource flexibly, and it attracts attention from both academic and industry in recent years. Guest operating systems in virtual machines can be various, and the states of virtual machines changes all the time. Due to the complexity of virtual computing environment, it brings tremendous challenges for security monitoring. Existing monitoring mechanism can not adapt to the dynamic and diversity of virtual machines. Therefore, a comprehensive monitoring framework, named ComMon, is proposed in this paper, which implements comprehensive monitoring from three aspects: network, process, and file. It has the characteristics of real-time, transparency and generality.

关键词： Monitoring Registers Kernel Linux Intrusion detection

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A method of multi-VM automatic network configuration

A method of multi-VM automatic network configuration

引用

IEEE International Conference on Intelligent computing and Intelligent systems (ICIS)

作者： Xin Ge Hai Jin Song Wu Xuanhua Shi Wei Gao 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 multi-VM (virtual machine) environment, the virtual machine network management plays an important role. Traditional multi-VM management systems are accustomed to using the DHCP mechanism. However, with the development of virtual network technology, DHCP is not suitable for constructing the stable and transparent virtual network environment. In this paper, we propose a method of multi-VM automatic network configuration, which focuses on multi-VM to initialize and configure the virtual network and provides a unified network management for physical and virtual machine system. We introduce concise communication model and protocol into the system to form a unified set of management mechanisms devoting to construct and simplify virtual machine environment. Through the performance comparison with XenServer, the multi-VM automatic network configuration system could improve the communication efficiency by 8-17% in average during the period of network initialization, and it stabilizes the whole network during the period of changing network configuration.

关键词： Virtual machining Environmental management Protocols Virtual manufacturing Resource management User interfaces Grid computing Computer science Computer network management technology management

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