Realization of a distributed OS component for internal clock synchronization in a LAN environment

Kim, K.H.K.; Im, Chansik; Athreya, P.

doi:10.1109/isorc.2002.1003726

Cited by 18 publications

(5 citation statements)

References 6 publications

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“…The TMO timing specification model allows programmers to specify start-time-windows and completion deadlines of RT computationsegments, rather than simplistically specifying priority values. After all, it is natural for RT application programmers to think about start-time-windows and completion deadlines rather than fragile priority schemes (Kim et al 2002c). In addition, programmers specify deadlines for result arrival in remote method calls, as depicted in Fig.…”

Section: Tmosm Description and Requirementsmentioning

confidence: 99%

A middleware model supporting time-triggered message-triggered objects for standard Linux systems

Jenks

Kim

et al. 2007

Real-Time Syst

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The Time-triggered Message-triggered Object (TMO) programming and specification scheme came out of an effort to remove the limitations of conventional object structuring techniques in developing real-time (RT) distributed computing components and composing distributed computing applications out of such components and others. It is a natural and syntactically small but semantically pow-76 Real-Time Syst (2007) 36: erful extension of the object oriented (OO) design and implementation techniques which allows the system designer to specify in natural and yet precise forms timing requirements imposed on data and function components of high-level distributed computing objects. TMO Support Middleware (TMOSM) was devised to be an efficient middleware architecture that can be easily adapted to many commercial-off-theshelf (COTS) hardware + kernel operating system platforms to form efficient TMO execution engines. However, up until 2003, its adaptations were done for Microsoft Windows platforms only. As we have been developing and refining an adaptation of TMOSM to the Linux 2.6 operating system platform in recent years, TMOSM has been refined to possess further improved modularity and portability. This paper presents the refined TMOSM as well as the techniques developed for efficient adaptation of TMOSM to the Linux 2.6 platform.

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Section: Tmosm Description and Requirementsmentioning

confidence: 99%

A middleware model supporting time-triggered message-triggered objects for standard Linux systems

Jenks

Kim

et al. 2007

Real-Time Syst

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“…The target node estimates the time on the transmitting node's clock based on the time-stamps on the synchronization messages and the message delay statistics. An approach to synchronize clocks via OS-or middleware architecture mechanism tried to reduce the scheduling delay [10]. The Network Time Protocol have been widely used to synchronize clocks in the internet domain.…”

Section: Approaches To Time Synchronization Schemesmentioning

confidence: 99%

Time Synchronization in Wireless Sensor Network Applications

Hong

2007

Software Technologies for Embedded and Ubiquitous Systems

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In most sensor network applications, events are time stamped with node's local time. However, energy is highly constrained resource in sensor networks. The purpose of this paper is to present a timesynchronization algorithm for sensor networks that aims at reducing the computation and communication energy expended by the algorithm. We use MAC-layer time stamping and estimate the clock drift rate and the offset in order to obtain high precision performance. Our algorithm works in two steps. In the first step, a spanning tree is built in the sensor network. In the second step, all nodes in the network synchronize their clocks to their parent nodes. We analyze and implement our time synchronization algorithm on Berkeley MicaZ platform and show that it can synchronize a pair of neighboring motes to an average accuracy of around one microsecond with communication complexity of O(log n).

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“…The precision of the global time should be accepted as a constraint for the implementation. Different approaches for the implementation of global time were developed [18,25]. In the case of a simple master-worker approach, the master node broadcasts its local clock to all worker nodes in the system and each worker node synchronizes its local clock to the received time with adjustment based on the known network delay range.…”

Section: Global Timestamp Based Approachmentioning

confidence: 99%

Toward enhanced data consistency in distributed virtual environments

2003

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Distributed virtual environments are rapidly gaining in popularity for the implementation of intuitive and collaborative workspaces. In distributed virtual environments, geographically dispersed user sites possess considerable capabilities for computing and cooperation with other user sites. Primary challenges that have to be addressed by these systems are compensating network latency jitters, keeping system-wide data consistent, enabling fair resource sharing and interaction between the users. This paper reviews a global time-stamp based approach, which is developed by authors to enhance the fairness and consistency across the distributed virtual environments. The approach is described in combination with three different implementation philosophies, a centralized approach similar to client-server model, a decentralized approach similar to peer-to-peer model, and a combined approach consisting of hierarchical layers of centralized and decentralized approaches. Based on a new object-oriented real-time programming methodology called the time-triggered message-triggered object (TMO) programming scheme, two different implementations were tested and compared.

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Realization of a distributed OS component for internal clock synchronization in a LAN environment

Cited by 18 publications

References 6 publications

A middleware model supporting time-triggered message-triggered objects for standard Linux systems

A middleware model supporting time-triggered message-triggered objects for standard Linux systems

Time Synchronization in Wireless Sensor Network Applications

Toward enhanced data consistency in distributed virtual environments

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