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  • 1
    Online Resource
    Online Resource
    Wiley ; 2013
    In:  Concurrency and Computation: Practice and Experience Vol. 25, No. 18 ( 2013-12-25), p. 2540-2560
    In: Concurrency and Computation: Practice and Experience, Wiley, Vol. 25, No. 18 ( 2013-12-25), p. 2540-2560
    Abstract: In recent years, cloud computing has become popular and its applications widespread. Thus, there exists a common concern, that is, how to arrange and monitor various resources in the cloud computing environment. In the literature, Ganglia and Network Weather Service (NWS) were used to monitor and gather node status and network‐related data, respectively. With supports of Ganglia and NWS, one can effectively administer available resources in the cloud computing environment. In order to achieve high performance of cloud computing, comprehensive monitoring and efficient management are critical. Ganglia is often used to gather status data of resources, such as live states of hosts, CPU or memory utilizations, and surely Ganglia is also capable of monitoring network‐related information; however, instead of Ganglia, we used NWS services to gather network‐related information such as end‐to‐end transmission control protocol/Internet protocol performance data. Compared with Ganglia, NWS services offer more selections and flexibility for measurement schemes. Besides, NWS services could be deployed with nonintruding manner that makes it easier and faster in deploying services to cloud nodes. The network‐related information is acquired immediately after deployment. Although NWS services also provide measurements for CPU and memory utilizations, but less functionality is provided by them than Ganglia in these aspects. Therefore, we combine advantageous features of Ganglia and NWS to achieve the aims of effective monitoring and management of available resources in the cloud environment. Nevertheless, Ganglia and NWS services may not provide sufficient data in realistic situations due to diversified needs of users, especially application developers. For instance, users are not able to directly access utilizations or allocations of resources in the cloud environment via interfaces or channels of Ganglia or NWS. In addition, NWS services based on a domain‐based network information model could greatly decrease overheads caused by unnecessary measurements. Hence, we propose a heuristic QoS measurement approach based on the domain‐based information model. This measurement approach is capable of providing essential information to satisfy user requirements, and thus let users manage and monitor various resources in the cloud environment in a more efficient way. © 2013 Wiley Periodicals, Inc.
    Type of Medium: Online Resource
    ISSN: 1532-0626 , 1532-0634
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2013
    detail.hit.zdb_id: 2052606-4
    SSG: 11
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  • 2
    Online Resource
    Online Resource
    SAGE Publications ; 2005
    In:  SIMULATION Vol. 81, No. 1 ( 2005-01), p. 45-56
    In: SIMULATION, SAGE Publications, Vol. 81, No. 1 ( 2005-01), p. 45-56
    Abstract: The High Level Architecture (HLA) is the IEEE 1516 standard to model and design a distributive simulation environment. It establishes a common distributed simulation framework, which facilitates the interoperability and reuse of simulation components. However, some HLA services are very low level and difficult to use, especially when a simulation is designed with a particular time synchronization mechanism. This article describes an agent interface, called Smart Time Management (STM). The capabilities of the STM include the following: taking over the event’s time-stamp tagging work, maintaining a lookahead value, and unifying different time advance approaches provided by the HLA runtime infrastructure. In addition, it adopts the time warp mechanism for optimistic simulation. In conclusion, the STM presents a unified and scalable middle layer to allow the user to construct an HLA federation with a unanimous Time Management interface when solving the synchronization issue.
    Type of Medium: Online Resource
    ISSN: 0037-5497 , 1741-3133
    RVK:
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2005
    detail.hit.zdb_id: 2072208-4
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