Dissertations / Theses: 'Linux'

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Ohlenroth, Matthias, and Thomas Radke. "Linux SMP." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199800243.

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Jahre, Daniel. "Linux International." Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200194.

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er Erfolg eines Betriebssystems hängt auch davon ab, wie gut Personen, die der englischen Sprache nicht mächtig sind, mit ihm umgehen können. Ich möchte darüber informieren, wie gut verschiedene Sprachen und Schriften unterstüzt werden. Darüber hinaus möchte ich aufzeigen, wo Probleme auftreten können und wie man sich helfen kann. Auch wenn man vielleicht selbst mit einem englischen Linux zufrieden ist, sollte man wissen, wie man z.B. auch dem einen oder anderen Austauschstudenten das Arbeiten mit Linux erleichtern kann.

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Heik, Andreas. "Linux und Multimedia?" Universitätsbibliothek Chemnitz, 1999. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199900092.

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Müller, Thomas, and Christoph Ziegler. "Wie funktioniert Linux?" Universitätsbibliothek Chemnitz, 2000. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200000101.

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Unterlagen zu einem Vortrag im Rahmen des 2. Chemnitzer Linuxtages. Neben einem Ueberblick ueber Struktur und Eigenschaften wird vor allem auf die Konzepte eingegangen. Der Vortrag endet mit praktischen Beispielen wie ausgewaehlten Kommandos und Umgang mit der Shell. Zielgruppe dieses Vortrags sind Neueinsteiger und Umsteiger.

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Heik, Andreas. "Multimedia unter Linux." Universitätsbibliothek Chemnitz, 2000. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200000205.

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Mit der Verbreitung von Linux als Desktopsystem steigen auch die Anforderungen des Nutzers an multimediale Fähigkeiten wie z.B. das Anhören eines digitalisierten Musikstückes, die Einbindung einer Digitalkamera in die Bildverarbeitung, die Nutzung einer Radio/TV-Karte oder gar das Bearbeiten eines kleinen Videofilms.

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Heik, Andreas. "Linux und DVD?" Universitätsbibliothek Chemnitz, 2000. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200000370.

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Gemeinsamer Workshop von Universitaetsrechenzentrum und Professur Rechnernetze und verteilte Systeme (Fakultaet fuer Informatik) der TU Chemnitz. Workshop-Thema: Infrastruktur der ¨Digitalen Universitaet¨

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Weihrauch, Thomas. "Grafiksoftware für Linux." Universitätsbibliothek Chemnitz, 2000. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200000456.

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Gemeinsamer Workshop von Universitaetsrechenzentrum und Professur Rechnernetze und verteilte Systeme (Fakultaet fuer Informatik) der TU Chemnitz. Workshop-Thema: Infrastruktur der ¨Digitalen Universitaet¨ Vortrag-Thema: Grafiksoftwrae für Linux Alternativen zu kommerziellen Produkten aus dem OpenSource- und FreeWarebereich.

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Ehrig, Matthias. "Drucken unter Linux." Universitätsbibliothek Chemnitz, 2000. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200000817.

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Müller, Thomas, and Gerd Heide. "Wie funktioniert Linux?" Universitätsbibliothek Chemnitz, 2001. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200100174.

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Unterlagen zu einem Vortrag im Rahmen des 3. Chemnitzer Linux-Tages. Neben einem Überblick über Struktur und Eigenschaften wird vor allem auf die Konzepte eingegangen. Den Abschluß bildet die Darstellung von Eigenschaften und Prinzipien grafischer Oberflächen. Zielgruppe dieses Vortrags sind Neueinsteiger und Umsteiger.

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Müller, Thomas, and Gerd Heide. "Wie funktioniert Linux?" Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200164.

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Unterlagen zu einem Vortrag im Rahmen des 4. Chemnitzer Linux-Tages. Neben einem Überblick über Struktur und Eigenschaften wird vor allem auf die Konzepte eingegangen. Den Abschluß bildet die Darstellung von Eigenschaften und Prinzipien grafischer Oberflächen. Zielgruppe dieses Vortrags sind Neueinsteiger und Umsteiger.

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Müller, Andreas. "Bürosoftware unter Linux." Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200235.

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Müller, Thomas, and Gerd Heide. "Wie funktioniert Linux?" Universitätsbibliothek Chemnitz, 2003. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200300211.

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Unterlagen zu einem Vortrag im Rahmen des 5. Chemnitzer Linux-Tages. Neben einem Überblick über Struktur und Eigenschaften wird vor allem auf die Konzepte eingegangen. Den Abschluß bildet die Darstellung von Eigenschaften und Prinzipien grafischer Oberflächen. Zielgruppe dieses Vortrags sind Neueinsteiger und Umsteiger.

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Team, der Chemnitzer Linux-Tage. "25 Linux-Kniffe." Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200900416.

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Driveklepp, Pål, Olav Morken, and Gunnar Rangøy. "Linux Support for AVR32 UC3A : Adaption of the Linux kernel and toolchain." Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9006.

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The use of Linux in embedded systems is steadily growing in popularity. The UC3A is a series of high performance, low power 32-bit microcontrollers aimed at several industrial and commercial applications including PLC, instrumentation, phones, vending machines and more. The main goal of this project was to complete the adaptation of the Linux kernel, compiler and loader software, in order to enable the Linux kernel to load and run applications on this device. In addition, a set of useful applications should be picked, compiled and tested on the target platform to indicate a complete software solution. This master's thesis is a continuation, by the same three students, of the work of a student project during the fall of 2008. In this report we present in detail the findings, challenges, choices and and solutions involved in the working process. During the course of this project, we have successfully adapted the Linux kernel, and a toolchain for generating binaries loadable by Linux. A set of test applications have been compiled and tested on the resulting platform. This project has resulted in the submission of a revised patch series for the U-Boot boot loader, one patch series for Linux, and one for the toolchain. Requirements have been created, and tests for the requirements have been carried out.

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Brolin, Jonas, and Mikael Hedegren. "Packet Aggregation in Linux." Thesis, Karlstad University, Division for Information Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1726.

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Voice over IP (VoIP) traffic in a multi-hop wireless mesh network (WMN) suffers from a large overhead due to mac/IP/UDP/RTP headers and time collisions. A consequence of the large overhead is that only a small number of concurrent VoIP calls can be supported in a WMN[17]. Hop-to-hop packet aggregation can reduce network overhead and increase the capacity. Packet aggregation is a concept which combines several small packets, destined to a common next-hop destination, to one large packet. The goal of this thesis was to implement packet aggregation on a Linux distribution and to increase the number of concurrent VoIP calls. We use as testbed a two-hop WMN with a fixed data rate of 2Mbit/s. Traffic was generated between nodes using MGEN[20] to simulate VoIP behavior. The results from the tests show that the number of supported concurrent flows in the testbed is increased by 135% compared to unaggregated traffic.

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Sivertsen, Frode. "Experiences with Linux Mobile." Thesis, Norwegian University of Science and Technology, Department of Telematics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9560.

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Mobile phones are becoming more and more complex in terms of both hardware and software. Linux Mobile, as a term covering both the kernel and its surrounding components that together form the operating system, is said to have the potential to become the de-facto standard operating system for mobile phones and an enabler for advanced future mobile services. This master thesis evaluates key aspects and central mechanisms of the Linux kernel and how it supports its surrounding hardware and software components in a flexible manner. The main work consisted of investigating the necessary kernel subsystems, with focus on the latest major kernel release for as being able to provide the demanded real-time responsiveness for mobile phones. Further, the typical hardware architecture for this form factor is examined and discussed with focus on the important aspects of responsibility, power management, and memory. The combination of the hardware and the flexibility of Linux is demonstrated through the booting process. Both major commercial and open source development platforms are investigated to elaborate on the opportunities of employing Linux as an enabler for advanced mobile services. The attempt of building a cross platform tool chain as a basis for a development platform was carried out with only partial success. It is described with the results achieved and steps planned. Based on the topics discussed and the results achieved the thesis is concluded with a discussion of whether Linux Mobile has the potential to become the de-facto standard mobile operating system, and what challenges and opportunities that are brought along with it.

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Schreiber, Alexander. "Linux 2.4 Netfilter/iptables." Universitätsbibliothek Chemnitz, 2000. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200000511.

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Der vorliegende Vortrag gibt einen Ueberblick ueber den neuen Kernel-Firewall von Linux 2.4, das Netfilter/iptables System. Es werden die Moeglichkeiten des neuen Systems erlaeutert sowie die Vergleiche mit den Vorgaengern praesentiert.

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Schreiber, Alexander. "Linux - aktiv im Netz." Universitätsbibliothek Chemnitz, 2000. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200000538.

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Schreiber, Alexander. "EDV-Paranoia unter Linux." Universitätsbibliothek Chemnitz, 2000. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200000549.

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Parthey, Mirko. "IP Security für Linux." Thesis, Universitätsbibliothek Chemnitz, 2001. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200100087.

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Die Nutzung des Internet für sicherheitskritische Anwendungen erfordert kryptographische Schutzmechanismen. IP Security (IPsec) definiert dafür geeignete Protokolle. Diese Arbeit gibt einen Überblick über IPsec. Eine IPsec-Implementierung für Linux (FreeS/WAN) wird auf Erweiterbarkeit und Praxistauglichkeit untersucht
Using the Internet in security-critical areas requires cryptographic protection, for which IP Security (IPsec) defines suitable protocols. This paper gives an overview of IPsec. A Linux implementation of IPsec is examined under the aspects of extendability and usability

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Heik, Andreas. "FireWire, DV unter Linux?" Universitätsbibliothek Chemnitz, 2001. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200100215.

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Digitale Schnittkarten sind unterdessen sehr günstig zu haben. Damit ist FireWire langsam auf dem Weg zu einer selbstverständlichen Schnittstelle für den PC. Videokameras mit DV-Schnittstelle sind für den Heimanwender ebenfalls erschwinglich. Die Möglichkeit, kleine Videofilme verlustfrei zu schneiden erscheint dadurch sehr lukrativ. Wie sieht diese Entwicklung im Linuxumfeld aus? Kann FireWire mehr als Videodaten transportieren?

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Jahre, Daniel. "Palm Programmierung unter Linux." Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200207.

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Die PDAs von Palm Inc. und seinen Lizenznehmern werden gerne zur Adress- und Terminverwaltung eingesetzt. Damit ist ihr Leistungspotential jedoch nicht erschöpft. Wer gerne selbst Applikationen für Palm PDAs entwickeln möchte, ist dabei nicht zwingend auf eine windowsbasierte Entwicklungsumgebung angewiesen. Unter Linux gibt es Compiler, Ressourceeditoren und Emulatoren für PalmOS. Ich werde in meinem Vortrag diese Werkzeuge vorstellen, demonstrieren und ein Beispielprogramm zeigen.

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Rößler, Marko. "Linux auf eingebetteten Systemen." Universitätsbibliothek Chemnitz, 2004. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200400327.

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Presentation held on the 123. Unix-Stammtisch. It contains information about the usage of Linux on embedded systems. The boot process of Linux, the design of an embedded system environment and small libraries and tools are discussed in detail
Vortrag zum 123. Unix Stammtisch der TU-Chemnitz. Befasst sich mit dem Entwurf und Betrieb von eingebetteten Systemen mit dem Betriebssystem Linux. Von der D-Box bis zur Linux-Armbanduhr, der Linux-Boot Prozess, Aufbau einer Linuxumgebung undminimalistisches Bibiotheken

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Parthey, Daniel. "Booting Linux Really Fast." Thesis, Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600666.

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Diese Arbeit untersucht die Dauer von Bootvorgängen auf Linux-Systemen vom Einschalten des Rechners bis zur Benutzeranmeldung. Zeitintensive Abschnitte des Bootvorganges werden untersucht und Methoden zur Beschleunigung diskutiert. Dies beinhaltet eine Analyse verschiedener BIOS Versionen, der Kernel-Initialisierung und unterschiedliche Ansätze, Dienste zu starten. Es werden Startvorgänge eines gewöhnlichen Desktop-Systems mit einem eingebetteten VIA EPIA-ML-6000EA Mini-ITX System verglichen
This research project evaluates startup times of the linux boot process from power-on until user login. Time consuming parts of the boot process are investigated and methods how to speed up the whole process are discussed. It includes an analysis and comparison of different BIOSes, the kernel startup sequence and different approaches to start user space services. This project also compares the startup times of everyday desktop systems with the EPIA-ML6000EA Mini-ITX board, an embedded x86-compatible system

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Meier, Wilhelm, Jens Pönisch, Uwe Berger, Andreas Heik, Harald König, Cornelius Kölbel, Martin Gerhard Loschwitz, et al. "Chemnitzer Linux-Tage 2013." Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-105403.

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Die Chemnitzer Linux-Tage sind eine Veranstaltung rund um das Thema Open Source. Im Jahr 2013 wurden 106 Vorträge und Workshops gehalten. Der Band enthält ausführliche Beiträge zu 11 Hauptvorträgen sowie Zusammenfassungen zu 95 weiteren Vorträgen.

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Ahlstedt, Sebastian, and Karlsson David Granath. "Diskkrypteringsprestanda i GNU/Linux." Thesis, Linnéuniversitetet, Institutionen för datavetenskap (DV), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-26411.

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This thesis compares the impact on disk performance in a GNU/Linux environmentwith three encryption algorithms: AES, Serpent and Twofish in three different implementations: DM-crypt, Loop-AES and Truecrypt. For all three algorithms a key length of 256 bits is used. The thesis shows that the least performance impact during data encryption, and thus file writing, is reached by using AES or Twofish encryption implemented in DM-crypt or TrueCrypt. The thesis shows that some data operations with a sufficiently low processor utilization barely affects disk performance at all if encrypted using the optimal implementation and algorithm. It is also discovered that the performance impact during data decryption, or file reading, can be minimized by using the most efficient implementation and algorithm. The best results are met with the AES or Twofish cipher, regardless of implementation. An important conclusion that is drawn is that it is hard to determine a superior encryption solution for all purposes. However, by reviewing and examining the collected data from all aspects of disk performance the AES implementation in TrueCrypt is, with small marginals, determined to be the most optimal.
Undersökningen jämför hur krypteringsalgoritmerna AES, Serpent och Twofish implementerade i DM-crypt, Loop-AES och TrueCrypt påverkar diskprestandan i en GNU/Linux-miljö. Samtliga krypteringsalgoritmer tillämpas med en nyckellängd på 256 bitar. Undersökningen visar att högst skrivhastighet och således krypteringshastighet uppnås med algoritmerna AES och Twofish i DM-crypt eller Truecrypt. Krypteringens påverkan på diskprestanda är beroende av vilka typer av operationer som utförs och hur hög processorsysselsättningsgraden är. Vid simplare I/O-operationer har den mest optimala krypteringslösningen knappt någon påverkan på diskprestandan överhuvudtaget. Undersökningen visar också att påverkan av prestanda vid dekryptering är minst vid tillämpning av AES eller Twofish oavsett implementering. En viktig slutsats som dras är att det inte finns en överlägsen krypteringslösning för samtliga användningsområden. Genom att sammanställa och granska insamlad data gällande samtliga aspekter beträffande diskprestanda fastställs TrueCrypts implementation av AES till att vara den mest optimala, trots små marginaler.

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Courtenay, Mark, Cornelius Kölbel, Jens Lang, Wolfram Luithardt, Falk Zscheile, Frederik Kramer, Markus Schneider, et al. "Chemnitzer Linux-Tage 2014." Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-133499.

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Der vorliegende Tagungsband beinhaltet 13 Beiträge von Referenten der Chemnitzer Linux-Tage 2014 sowie Zusammenfassungen von weiteren 78 Vorträgen und 14 Workshops. Die Beiträge umfassen das breite Spektrum der Veranstaltung, darunter Probleme von eingebetteten Systemen und vertrauliche Kommunikation.

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Demierre, Andéol, Monika Eggers, Anselm R. Garbe, Thomas Groß, Volker Jaenisch, Marco Jung, Klaus Knopper, et al. "Chemnitzer Linux-Tage 2010." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000079.

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Die Chemnitzer Linux-Tage fanden am 13. und 14. März 2010 auf dem Campus der Technischen Universität Chemnitz statt. Neben den Präsentationen im Foyer zogen vor allem die Vorträge über 2500 Besucher zur 12. Auflage der Veranstaltung. Der Band vereint den Inhalt von 15 Hauptvorträgen und die Abstrakts von 76 weiteren Beiträgen und stellt damit einen Überblick über das weit gefächerte Programm der Veranstaltung dar
The Chemnitz Linux Days took place at the campus of the Chemnitz University of Technology. Besides the presentations at the foyer the lectures were first of all attractive for more than 2.500 visitors. This volume contains the content of 15 main lectures and abstracts of 76 further talks and hence gives a survey of the broadly based program of this event

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Wachtler, Axel, Jörg Wunsch, Matthias Vorwerk, Daniel Kriesten, Sebastian Kratzert, Ulrich Heinkel, Wolfram Luithardt, et al. "Chemnitzer Linux-Tage 2011." Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-65020.

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Die Chemnitzer Linux-Tage sind eine Veranstaltung rund um das Thema Open Source. Im Jahr 2011 wurden 102 Vorträge und Workshops gehalten. Der Band enthält ausführliche Beiträge zu 12 Hauptvorträgen sowie Zusammenfassungen zu 78 weiteren Vorträgen
The "Chemnitz Linux Days" is a conference that deals with Linux and Open Source Software. In 2011 102 talks and workshops were given. This volume contains papers of 12 main lectures and 78 abstracts (in german)

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Schöner, Axel, Wilhelm Meier, Jens Kubieziel, Uwe Berger, Sebastian Götz, Max Leuthäuser, Christian Piechnick, et al. "Chemnitzer Linux-Tage 2012." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-83272.

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Die Chemnitzer Linux-Tage sind eine Veranstaltung rund um das Thema Open Source. Im Jahr 2012 wurden 104 Vorträge und Workshops gehalten. Der Band enthält ausführliche Beiträge zu 14 Hauptvorträgen sowie Zusammenfassungen zu 90 weiteren Vorträgen
The "Chemnitz Linux Days" is a conference that deals with Linux and Open Source Software. In 2012 104 talks and workshops were given. This volume contains papers of 14 main lectures and 90 abstracts

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Ayala, Joseph, and Eric Sorton. "LINUX POWERED TELEMETRY PROCESSING." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606490.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California
Since its debut, the Linux operating system has garnered much attention in the software development community. This paper discusses the open source operating system, Linux, and it’s application as the operating system powering a commercial off-the-shelf telemetry processing system. The paper begins by discussing what are the real-time requirements of the operating system in a telemetry processing system. A discussion to the Linux system is then presented. Soft real-time features of Linux are discussed which allow it to meet the telemetry processing requirements. Linux is compared with the more traditional operating system products and points are made as to why open source software is just as capable, if not preferable, of handling mission critical applications. The paper also presents the authors’ view of future of Linux and open source software in the telemetry marketplace. The paper concludes with a summary of products available for Linux that support telemetry processing and the data acquisition environment.

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Prívozník, Michal. "Lokální vyhledávání pro Linux." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2010. http://www.nusl.cz/ntk/nusl-237126.

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This work deals with indexing, difeerent types of indexing structures their advantages and disadvantages. It provides the basis for a search engine with support of morphology or difeerent file formats. Provides insight to the basic ideas, which answer is aim of the master's thesis.

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Parthey, Mirko. "IP Security für Linux." [S.l. : s.n.], 2001. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10047768.

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Polách, Milan. "Zabezpečení operačního systému Linux." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218925.

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This thesis is focused on the possibility of better networking security operating system GNU/Linux with an appropriate set of rules Netfilter. There was established a program to allow easy configuration of rules for IP Address versions 4 and 6. This program not only allows to set individual rules, but also interfere with the newly required service and decide, how it will be further worked with. The first is the theoretical part describes the network communication with the model TCP/IP, the following is the introduction of Netfilter and outlining the local security. The practical part describes the various technologies and methods used for programming. The result of this work is easy to use program to set firewall rules for IP Address versions 6 with the possibility of deciding on the new established network traffic. The program is designed for new users of the operating system, who want to better secure their computer without the knowledge of Netfilter.

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Khan, Ahmed. "Evaluation and Implementation of Linux User-space Fast Path Technologies : Linux, User-space." Thesis, Mittuniversitetet, Institutionen för informationsteknologi och medier, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-19611.

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The enormous increase in device connectivity for data and telecom devices places significant challenges on the packet processing techniques used in embedded systems such as IP stacks. Therefore, the traditional packet processing software cannot handle the line rate packet flow even for the most cutting edge devices. A solution to this problem is to allow applications to directly receive packets without passing through the normal kernel stack and drivers i.e. interface directly with the hardware. Two such open source libraries for Linux are PF_RING and Netmap. In addition Freescale has a similar technology called USDPAA. In order to satisfy the first goal of this project, a detailed analysis and evaluation of PF_RING, Netmap and USDPAA has been conducted in order to determine how they compare in relation to a number of criteria such as functionality, support, performance, ease of use, software/ hardware dependencies and project stability etc. Secondly based on the earlier work, a design is proposed that can be used to build and port an application to run on Freescale DPAA based hardware (P4080) on top of USDPAA.

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Katz, David Gabriel. "Popcorn Linux: Cross Kernel Process and Thread Migration in a Linux-Based Multikernel." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/52561.

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Proliferation of new computing hardware platforms that support increasing numbers of cores, as well as increasing ISA heterogeneity, is creating opportunity for systems software developers to question existing software architecture. One promising emerging systems architecture is the multikernel, pioneered in Barrelfish OS. The multikernel directly addresses the challenges of high core counts and increased heterogeneity by partitioning the system into multiple independently running kernel instances which cooperate to form a single operating system. Popcorn Linux is an adaptation of the multikernel concept to a Linux environment, melding the multikernel concept with the power and ubiquity of the Linux platform. The goal of the Popcorn Linux project is to provide a Linux-based single-system image environment for heterogeneous hardware. In constructing this environment, Linux must be extended to distribute the plethora of operating system services that it provides across kernel instances. This thesis presents the newly developed Popcorn Linux mechanism for migrating tasks and their address spaces between kernel instances at arbitrary points in their execution. Both process and thread migration is supported, and distributed address spaces are maintained and guaranteed to remain consistent between distributed thread group members running on different kernel instances. Tasks can migrate through an unlimited number of kernel instances, as well as back to previously visited kernel instances. Additionally, the full task life-cycle is supported, allowing migrated tasks to exit and create new children on whichever kernel instance happens to be hosting them. The mechanisms developed were vetted through unit testing, review, and a number of compute-bound benchmarks in a homogeneous x86 64bit environment. Correctness was demonstrated, and performance metrics were acquired. Popcorn Linux performance was shown to be reasonable when compared to SMP Linux. The mechanisms developed are therefore deemed feasible. Scalability was determined to be a function of workload characteristics, where in some cases Popcorn Linux out-scales SMP Linux and in other cases SMP Linux out-scales Popcorn Linux. Optimizations are recommended to reduce the maturity gap between Popcorn Linux and SMP Linux, improving Popcorn Linux performance.
Master of Science

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Shelton, Benjamin H. "Popcorn Linux: enabling efficient inter-core communication in a Linux-based multikernel operating system." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23119.

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As manufacturers introduce new machines with more cores, more NUMA-like architectures, and more tightly integrated heterogeneous processors, the traditional abstraction of a monolithic OS running on a SMP system is encountering new challenges. One proposed path forward is the multikernel operating system. Previous efforts have shown promising results both in scalability and in support for heterogeneity. However, one effort\'s source code is not freely available (FOS), and the other effort is not self-hosting and does not support a majority of existing applications (Barrelfish).

In this thesis, we present Popcorn, a Linux-based multikernel operating system. While Popcorn was a group effort, the boot layer code and the memory partitioning code are the author\'s work, and we present them in detail here. To our knowledge, we are the first to support multiple instances of the Linux kernel on a 64-bit x86 machine and to support more than 4 kernels running simultaneously.

We demonstrate that existing subsystems within Linux can be leveraged to meet the design goals of a multikernel OS. Taking this approach, we developed a fast inter-kernel network driver and messaging layer. We demonstrate that the network driver can share a 1 Gbit/s link without degraded performance and that in combination with guest kernels, it meets or exceeds the performance of SMP Linux with an event-based web server. We evaluate the messaging layer with microbenchmarks and conclude that it performs well given the limitations of current x86-64 hardware. Finally, we use the messaging layer to provide live process migration between cores.
Master of Science

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38

Lundell, Daniel. "Jämförelse av trådbibliotek för Linux." Thesis, University of Skövde, Department of Computer Science, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-831.

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Den dominerande implementationen av POSIX Threads-standarden för Linux har länge varit LinuxThreads. Detta trådbibliotek har på senare tid kritiserats för att leverera bland annat bristfällig effektivitet, skalbarhet och följsamhet till POSIX-standarden. Två nya projekt, Next Generation POSIX Threads (IBM, Intel) och Native POSIX Threads Library (Red Hat) siktar på att erbjuda bättre alternativ till LinuxThreads.

Denna undersökning jämför effektiviteten för dessa tre trådbibliotek, i synnerhet i samband med växling, skapande och synkronisering av trådar samt skalbarhet, huvudsakligen genom användandet av ett testprogram från Sun Microsystems.

Resultaten visar att NGPT skalar linjärt och är det klart effektivaste trådbiblioteket över 4600 trådar. NPTL är effektivast under 4600 trådar fast dess exponentiella kurva medför sämre resultat vid ett högre antal trådar. LinuxThreads skalade sämst och fick sämst resultat över 1200 trådar och resultaten visade även högst varians. Det rekommenderas att ersätta LinuxThreads med NPTL eller NGPT, beroende på kravet på skalbarhet.

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Eriksson, Fredrik. "Porting OSE Systems to Linux." Thesis, Mälardalen University, School of Innovation, Design and Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-9752.

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OSE is a real-time operating system from ENEA. One of the key features in OSE is the signaling interprocess communication (IPC) system. ENEA has also released a similar IPC system called LINX, that is platform independent.

For the purpose of running OSE programs under Linux, I have evaluated two software libraries that are designed to simulate the OSE programming environment. The libraries in question are called SoftApi and OSEPL, where SoftApi was developed by RealTime Logic and modified by me to utilize LINX for interprocess communication, and OSEPL was designed by me to overcome some of the limitations in SoftApi. Neither of those libraries proved to be suited for production systems, but it is deemed possible to implement a similar library that is.

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Schreiber, Alexander. "Linux-Dateisysteme: XFS und JFS." Universitätsbibliothek Chemnitz, 2000. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200000826.

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Der Vortrag stellt zwei Filesysteme aus der kommerziellen Welt vor die derzeit auf Linux portiert werden: JFS von IBM und XFS von SGI. Es wird ein Ueberblick ueber die beiden Dateissysteme, ihre Eigenschaften und ihre Portiertung gegeben.

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Pönisch, Jens. "SAP R/3 und Linux." Universitätsbibliothek Chemnitz, 2001. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200100182.

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42

Heik, Andreas. "Linux und Digital TV (DVB)." Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200179.

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Selbst im Bereich von Digital TV sitzt der Pinguin in der 1. Reihe. Mit einer DVB-Karte soll es möglich sein, digitale Programmvielfalt am PC zu erleben. Aber neben TV sind natürlich noch Funktionen wie Teletext verfügbar. Der PC läßt sich sogar in einen fernbedienbaren Videorecorder und DVD-Player verwandeln. Der Vortrag soll einen Überblick der unterstützten Hardware geben und ausgewählte Softwareentwicklungen vorstellen.

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Schreiber, Alexander. "Logical Volume Management unter Linux." Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200225.

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Baumgartl, Robert. "RTAI - Linux im harten Echtzeiteinsatz." Universitätsbibliothek Chemnitz, 2005. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200500078.

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Der Vortrag gibt eine Einführung in die Konstruktion von harten Echtzeitsystemen auf der Basis von Linux und RTAI. Inhaltliche Schwerpunkte sind: Virtualisierung der Interrupt-Hardware, Überblick über das Realtime Application Interface, Programmierung von RTAI-gestützten Applikationen, Alternativen: RTLinux, Microkernel & Co.

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Stein, Alexander. "Porting DotGNU to Embedded Linux." Master's thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-66724.

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Programming PLC systems is limited by the provided libraries. In contrary, hardware-near programming needs bigger efforts in e. g. initializing the hardware. This work others a foundation to combine advantages of both development sides. Therefore, Portable.NET from the DotGNU project has been used, which is an implementation of CLI, better known as “.NET”. The target system is the PLCcore-5484 microcontroller board, developed by SYS TEC electronic GmbH. Built upon the porting, two variants to use interrupt routines withing the Portabe.NET runtime environment have been analyzed. Finally, the reaction times to occuring interrupt events have been examined and compared
Die Programmierung für SPS-Systeme ist durch die gegebenen Bibliotheken beschränkt, während hardwarenahe Programmierung einen größeren Aufwand durch z.B. Initialisierungen hat. Diese Arbeit bietet eine Grundlage, um die Vorteile beider Entwicklungsseiten zu kombinieren. Dafür wurde Portable.NET des DotGNU-Projekts, eine Implementierung des CLI, bekannter unter dem Namen “.NET”, benutzt. Das Zielsystem ist das PLCcore-5484 Mikrocontrollerboard der SYS TEC electronic GmbH. Aufbauend auf der Portierung wurden zwei Varianten zur Einbindung von Interrupt-Routinen in die Portable.NET Laufzeitumgebung untersucht. Abschließend wurden die Reaktionszeiten zu eintretenden Interrupts analysiert und verglichen

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46

Ettorsson, Ola, and Tomas Nilsson. "Linux i Microsoft AD-miljö." Thesis, Högskolan Kristianstad, Sektionen för hälsa och samhälle, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-15552.

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Examensarbetet är en undersökning på hur det går att integrera Linux i en Microsoft AD-miljö. Detta genom att gå igenom de nödvändiga delarna för en lyckad autentisering. Arbetet tittar även på vissa skillnader mellan en Microsoft AD-miljö och en Samba AD-miljö vilket kan göra integreringen genomförbar eller inte. Undersökningen har gjorts med att ha Linux som klient mot en Microsoft AD-miljö men även att ha en Windows klient mot en Linux server installerad med Samba och dess AD-struktur. Tjänsterna som har inkluderats är de grundläggande tjänsterna så som inloggning och behörigheter gällande fildelning.

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Karlsson, Erik. "Evaluation of Linux Security Frameworks." Thesis, Umeå universitet, Institutionen för datavetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-36664.

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The number of threats to computers attached to networks continually increases. The focus of preventing security exploits has been on the network, while local exploits has been mostly overlooked. Many security problems in Unix systems stem from the way security is managed; by delegating all security decisions to object owners. There are a number of security frameworks which aim to remedy this in Linux by restricting access to kernel objects, such as files. Ericsson is interested in finding the best possible security frameworks for use with their Linux products.In this thesis, the available security frameworks are evaluated based on criteria given by Ericson. First, the theoretical foundation of computer security is explored to serve for an overview of the security frameworks and their properties. Then specific attributes are refined and their values gathered from each framework. These attributes then serve as a basis for selecting two frameworks for further testing.The selected frameworks are SELinux and AppArmor, based on commerical support, ease of integration, and overall protection measures. Tables with the collected attributes are presented for comparison.The frameworks TOMOYO and SMACK should have been given more consideration. AppArmor is not useful for the server-centric environment used at Ericsson.

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Bengtsson-Ölund, Robert, and Johan Mäkeläinen. "Android och Linux på Beagleboard." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-58111.

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Nedelchev, A. (Aleksandar). "Automating Linux post-mortem debugging." Master's thesis, University of Oulu, 2018. http://urn.fi/URN:NBN:fi:oulu-201806022428.

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Post-mortem debugging is often the last bastion of debugging solutions. It involves analyzing a raw memory dump of either a portion of memory or the whole memory of the system at an instance of time, much like a photograph. In order to able to read such a memory dump, you have to have knowledge about how the system was built and implemented. Some systems, especially embedded ones, are the ones that can benefit the most from it, due to other solutions being impractical or simply unavailable. The process of post-mortem debugging is cumbersome, as it requires a lot of file operations in order to be executed. The automation of post-mortem debugging can potentially increase its effectiveness greatly. This research was conducted at a large-scale Finnish telecommunications company, which uses embedded Linux devices in its products. The objective of this research was to provide a solution for automating Linux post-mortem debugging, which is better than the current solutions and workings available in the case company. The research method used is the acclaimed design-science research. The research justifies its approach by looking at related work exploring the benefits of automated debugging in general. It also looks at common trends and pitfalls when dealing with highly complex specialized embedded processing environments. The design science artifact, created by this research, was made by combining the justification from the related work, combined with the requirements and processes of the case company environment. The evaluation of the research, both quantitative and qualitative, explores its benefits and drawbacks from multiple points of view. Overall, the implementation of the design science artifact, created by this research, was a success. Its time-saving capabilities were clearly demonstrated, as well as its potential use as a learning tool for new hires and non-technical staff. The main drawback identified was the need of constant maintenance, which is common for applications with great variability in their environment.

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Zůna, Pavel. "Unified Network Authentication for Linux." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2011. http://www.nusl.cz/ntk/nusl-412854.

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Tato práce se zabývá návrhem a implementací řešení pro jednotnou síťovou autentizaci pro operační systém Linux založeného na integraci systémových démonů WinBind a SSSD. Cílem je navrhnout takové řešení, které umožní autentizaci Linuxových klientů do domén spravovaných adresářovými službami Windows Active Directory a domén spravovaných adresářovými službami dostupnými na Linuxu současně. První dvě kapitoly seznámí čtenáře s autentizačními mechanizmy a technologiemi, které se pro tyto účely použivají na operačních systémech Windows a Linux. Třetí kapitola se zabývá jádrem práce a vysvětluje rozhodnutí učiněná při návrhu implementovaného řešení. Samotná implementace je pak popsána v kapitole čtyři. Poslední kapitoly popisují experimenty a testování pro vybrané případy užití s návrhy a popisem možných rozšíření do budoucna.

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Dissertations / Theses on the topic 'Linux'

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