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effect of compression of performance in a demand paging operating system
Title
The effect of compression of performance in a demand paging operating system.
Creator
Wynn, Allen Chester., Florida Atlantic University, Wu, Jie, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description
In this thesis, we measure and analyze the effects of compression in a demand paging operating system. We first explore existing compression algorithms and page replacement policies currently in use. Then we examine the OS/2 operating system which is modified to include page-based compression. Software trace hooks are inserted into the operating system to determine the amount of time required to process a page fault for each type of page, e.g. non-compressed, compressed, zero-filled, and the...
Show moreIn this thesis, we measure and analyze the effects of compression in a demand paging operating system. We first explore existing compression algorithms and page replacement policies currently in use. Then we examine the OS/2 operating system which is modified to include page-based compression. Software trace hooks are inserted into the operating system to determine the amount of time required to process a page fault for each type of page, e.g. non-compressed, compressed, zero-filled, and the number of page faults for each type of page. Software trace measurements as well as physical timings are taken on a system without compressed pages and the same system with compressed pages. We find the system with compressed pages shows a slight increase in paging activity for memory constrained systems, but performance (time) is improved in both memory constrained and unconstrained systems.
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Date Issued
1997
PURL
http://purl.flvc.org/fcla/dt/15421
Subject Headings
Paging (Computer science), Data compression (Computer science), Operating systems (Computers)
Format
Document (PDF)
design and implementation of a simple master/slave interprocess-communication module
Title
The design and implementation of a simple master/slave interprocess-communication module.
Creator
Mandadi, Sanjay Reddy, Florida Atlantic University, Shankar, Ravi, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description
We explored the portability of various OS concepts to silicon. We wish to develop intellectual property blocks of various OS concepts, so that an embedded system designer has the option to mix and match. As a first step we have looked at inter-process communication (IPC) and Process Scheduling. We have implemented simple hardware building blocks for these. In our problem we utilize two processors, one each assigned as Master and Slave. Master is in control and implements the OS algorithms,...
Show moreWe explored the portability of various OS concepts to silicon. We wish to develop intellectual property blocks of various OS concepts, so that an embedded system designer has the option to mix and match. As a first step we have looked at inter-process communication (IPC) and Process Scheduling. We have implemented simple hardware building blocks for these. In our problem we utilize two processors, one each assigned as Master and Slave. Master is in control and implements the OS algorithms, while the Slave executes the user/application code. We show that these OS building blocks can be implemented in the hardware. Future effort of our group is to build a portfolio of OS IP blocks and explore optimization for various applications.
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Date Issued
2000
PURL
http://purl.flvc.org/fcla/dt/12690
Subject Headings
Operating systems (Computers), Computer networks--Design and construction, Multiprocessors
Format
Document (PDF)
Label routing protocol: A new cross-layer protocol for multi-hop ad hoc wireless network
Title
Label routing protocol: A new cross-layer protocol for multi-hop ad hoc wireless network.
Creator
Wang, Yu., Florida Atlantic University, Wu, Jie, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description
Compared to the traditional wireless network, the multi-hop ad hoc wireless network (simply called ad hoc networks) is self-configurable, dynamic, and distributed. During the past few years, many routing protocols have been proposed for this particular network environment. While in wired and optical networks, multi-protocol label switching (MPLS) has clearly shown its advantages in routing and switching such as flexibility, high efficiency, scalability, and low cost, however MPLS is complex...
Show moreCompared to the traditional wireless network, the multi-hop ad hoc wireless network (simply called ad hoc networks) is self-configurable, dynamic, and distributed. During the past few years, many routing protocols have been proposed for this particular network environment. While in wired and optical networks, multi-protocol label switching (MPLS) has clearly shown its advantages in routing and switching such as flexibility, high efficiency, scalability, and low cost, however MPLS is complex and does not consider the mobility issue for wireless networks, especially for ad hoc networks. This thesis migrates the label concept into the ad hoc network and provides a framework for the efficient Label Routing Protocol (LRP) in such a network. The MAC layer is also optimized with LRP for shorter delay, power saving, and higher efficiency. The simulation results show that the delay is improved significantly with this cross-layer routing protocol.
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Date Issued
2006
PURL
http://purl.flvc.org/fcla/dt/13321
Subject Headings
Computer network protocols, Wireless communication systems, Mobile computing, Computer algorithms, MPLS standard, Operating systems (Computers)
Format
Document (PDF)
A Modeling Methodology for an RTOS
Title
A Modeling Methodology for an RTOS.
Creator
Islam, Sifat, Shankar, Ravi, Florida Atlantic University
Abstract/Description
Enhanced system design productivity is key to satisfying time-to-market demands. One will have to exploit design reuse methodology to meet project schedule requirements. Integration of components often fails due to various concurrency violations. Concurrency issues arise when components executing in parallel share resources and interact with each other. Such a system may have intermittent, yet catastrophic failures, if these concurrency issues are not addressed properly. In this thesis, we...
Show moreEnhanced system design productivity is key to satisfying time-to-market demands. One will have to exploit design reuse methodology to meet project schedule requirements. Integration of components often fails due to various concurrency violations. Concurrency issues arise when components executing in parallel share resources and interact with each other. Such a system may have intermittent, yet catastrophic failures, if these concurrency issues are not addressed properly. In this thesis, we propose a methodology for developing concurrency compliant components from a requirement document. We have applied this methodology for developing process management and memory management aspects of a Real Time Operating System (RTOS). In this methodology, we start from a "customer' s" requirement document that is then mapped to activity diagram, swimlane diagram, class diagrams, and use case diagrams. To evolve a concurrency compliant design, we use the Message Sequence Chart plug-in for the Labeled Transition State Analyzer (LTSA). This plug-in lets us use Message Sequence Charts rather than coding in Finite State Processes (FSP). Later, we use MLDesigner to simulate our R TOS sub-system and demonstrate proper behavior of this sub-system.
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Date Issued
2007
PURL
http://purl.flvc.org/fau/fd/FA00012528
Subject Headings
Computer architecture, Object-oriented programming (Computer science), Real-time programming, Operating systems (Computers)
Format
Document (PDF)
Experimental implementation of the new prototype in Linux
Title
Experimental implementation of the new prototype in Linux.
Creator
Han, Gee Won., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description
The Transmission Control Protocol (TCP) is one of the core protocols of the Internet protocol suite. In the wired network, TCP performs remarkably well due to its scalability and distributed end-to-end congestion control algorithms. However, many studies have shown that the unmodified standard TCP performs poorly in networks with large bandwidth-delay products and/or lossy wireless links. In this thesis, we analyze the problems TCP exhibits in the wireless communication and develop TCP...
Show moreThe Transmission Control Protocol (TCP) is one of the core protocols of the Internet protocol suite. In the wired network, TCP performs remarkably well due to its scalability and distributed end-to-end congestion control algorithms. However, many studies have shown that the unmodified standard TCP performs poorly in networks with large bandwidth-delay products and/or lossy wireless links. In this thesis, we analyze the problems TCP exhibits in the wireless communication and develop TCP congestion control algorithm for mobile applications. We show that the optimal TCP congestion control and link scheduling scheme amounts to window-control oriented implicit primaldual solvers for underlying network utility maximization. Based on this idea, we used a scalable congestion control algorithm called QUeueIng-Control (QUIC) TCP where it utilizes queueing-delay based MaxWeight-type scheduler for wireless links developed in [34]. Simulation and test results are provided to evaluate the proposed schemes in practical networks.
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Date Issued
2013
PURL
http://purl.flvc.org/fcla/dt/3362375
Subject Headings
Ad hoc networks (Computer networks), Wireless sensor networks, Embedded computer systems, Programming, Operating systems (Computers), Network performance (Telecommunication), TCP/IP (Computer network protocol)
Format
Document (PDF)
An implementation of the IEEE 1609.4 wave standard for use in a vehicular networking testbed
Title
An implementation of the IEEE 1609.4 wave standard for use in a vehicular networking testbed.
Creator
Kuffermann, Kyle, Mahgoub, Imad, Florida Atlantic University, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description
We present an implementation of the IEEE WAVE (Wireless Access in Vehicular Environments) 1609.4 standard, Multichannel Operation. This implementation provides concurrent access to a control channel and one or more service channels, enabling vehicles to communicate among each other on multiple service channels while still being able to receive urgent and control information on the control channel. Also included is functionality that provides over-the-air timing synchronization, allowing...
Show moreWe present an implementation of the IEEE WAVE (Wireless Access in Vehicular Environments) 1609.4 standard, Multichannel Operation. This implementation provides concurrent access to a control channel and one or more service channels, enabling vehicles to communicate among each other on multiple service channels while still being able to receive urgent and control information on the control channel. Also included is functionality that provides over-the-air timing synchronization, allowing participation in alternating channel access in the absence of a reliable time source. Our implementation runs on embedded Linux and is built on top of IEEE 802.11p, as well as a customized device driver. This implementation will serve as a key compo- nent in our IEEE 1609-compliant Vehicular Multi-technology Communication Device (VMCD) that is being developed for a VANET testbed under the Smart Drive initiative, supported by the National Science Foundation.
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Date Issued
2014
PURL
http://purl.flvc.org/fau/fd/FA00004299, http://purl.flvc.org/fau/fd/FA00004299
Subject Headings
Vehicular ad hoc networks (Computer networks)., Wireless sensor networks., Wireless communication systems., Wireless LANs., Linux., Expert systems (Computer science), Operating systems (Computers)
Format
Document (PDF)