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System Implementation of a Real-time, Content based Application Router for a Managed Publish-Subscribe System

Muthuswamy, S.
Citation:

Master's Thesis, School of Electrical Engineering and Computer Science, Washington State University, August 2008.

Abstract:

Accurate and efficient monitoring of the electric power grid (EPG) requires that the status information from the substation and the control commands from the control center, reaches the control center and the substation respectively in real-time and secured. The latency of this secured communication flow between the substation and the control center should be low and contained. GridStat is a distributed publish-subscribe middleware framework that tries to address these current and the future quality-of-service (QoS) requirements of the communication infrastructure of the EPG. GridStat’s flexible architecture allows a wider range of control applications to make use of the wealth of data available from the substation, securely and in real-time. The various components within GridStat contribute to the different QoS attributes. The component within GridStat that is primarily responsible for containing the end-to-end latency is the status router (SR). SR is an application router which routes events from the publisher to the interested subscribers at the requested rate. The current prototype of the SR in Java limits its real-time capabilities because of the lack of application control over the execution of the garbage collector within Java. This thesis explores the various real-time mechanisms that are available and required to implement a real-time content based application router that can meet the QoS requirements of the EPG. It implements the SR in C/C++ programming language with the use of real-time features provided by the operating system (OS) such as priority scheduling, real-time threads and memory locking.

It also explores the various real-time extensions/patches that enhances the real-time capabilities of a general purpose OS such as Linux. Such an implementation alone will not be able to meet the QoS requirements under all operating environments and conditions. Network congestion and packet losses will have a detrimental effect on the QoS. To be able to satisfy the QoS requirements under such conditions, there is a need of a scheduling algorithm that is capable of achieving end-to-end delay bounds. This thesis explores the effects of network protocol on the placement of the scheduling algorithm and also provides a system implementation of the Delay-Earliest Due Date scheduling algorithm as a queuing discipline within the kernel.

Publication Status:
Published
Publication Type:
M.S. Thesis
Publication Date:
08/01/2008
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