International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, Nevada / In this paper we present the REAL/STONE Real-Time Tester, a tool for performance evaluation of real-time UNIX operating systems. The REAL/STONE Real-Time Tester is a synthetic benchmark that simulates a typical real-time environment. The tool performs typical real-time operations, such as: (a) reads data from an external source and accesses it periodically, (b) processes data through a number of real-time processes, and © displays the final data. This study can help users in selecting the most-effective real-time UNIX operating system for a given application.

International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada / NASA's ground telemetry data systems developed by the Microelectronics Systems Branch at the Goddard Space Flight Center, use a generic but expandable architecture known as the "Functional Components Approach." This approach is based on the industry standard VMEbus and makes use of multiple commercial and custom VLSI hardware based cards to provide standard off-the-shelf telemetry processing functions (e.g., frame synchronization, packet processing, etc.) for many telemetry data handling applications. To maintain maximum flexibility and performance of these systems, a special real-time system environment has been developed, the Modular Environment for Data Systems (MEDS). Currently, MEDS comprises over 300,000 lines of tested and operational code based on a non-UNIX real-time commercial operating system. To provide for increased functionality and adherence to industry standards, this software is being transformed to run under a UNIX-compatible real-time environment. This effort must allow for existing systems and interfaces and provide exact duplicates of the system functions now used in the current real-time environment. Various techniques will be used to provide a relatively quick transition to this new real-time operating system environment. Additionally, all standard MEDS card to card and system to system interfaces will be preserved, providing for a smooth transition and allowing for telemetry processing cards that have not yet been converted to reside side-by-side with cards that have been converted. This paper describes this conversion effort.

Typescript (photocopy). / Digitized by Kansas Correctional Industries

Typescript (photocopy). / Digitized by Kansas Correctional Industries / Department: Computer Science.

Typescript (photocopy). / Digitized by Kansas Correctional Industries

Orientador: Paulo Licio de Geus / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação / Made available in DSpace on 2018-10-23T18:28:25Z (GMT). No. of bitstreams: 1 Silva_CarlosAlbertoda_M.pdf: 4669072 bytes, checksum: fa20898c86c43bbc7ecdd83f9bce7f4b (MD5) Previous issue date: 2001 / Mestrado / Mestre em Ciência da Computação

<p>Security in operating systems is a highly topical subject nowadays as the Internet keeps expanding. The larger the Internet gets the more systems, with valuable information, get connected, which could be subjects of attacks. An operating system needs to protect its information from these attacks. Many servers are using UNIX based operating systems and the security in these systems is a widely discussed topic.</p><p>This project is going to test and investigate the security in two of the most common UNIX distributions, both based on the Berkley Software Distribution (BSD). The selected systems are FreeBSD and OpenBSD. The Add-on called TrustedBSD/SEBSD for FreeBSD will also be a subject for this project. A comparison of the security features in the two systems was performed both theoretically and practically and this report reflects the results of these experiments and comparisons. A conclusion is that each system suits best in different environments with different needs. The selected distributions also have different level of security in specific areas. An introduction to security in operating systems on a general basis is provided before the actual comparison begins.</p>

This thesis describes the implementation of a UNIX-styled shell environment for cloud systems. This new scripting language, the cloud shell (CLSH), uses a syntax based upon the familiar BASH shell of UNIX systems. This familiar syntax allows users to quickly learn the new environment. The difference, as compared to BASH, is that CLSH gives the user easy access to the parallelism of the cloud. Indeed, the user does not need to explicitly refer to the cloud at all; the cloud becomes simply a virtual file system and the user experience is quite similar to standard bash programming. This cloud shell is built into Hadoop¡¦s HDFS file system. The difference, as compared to HDFS, is that CLSH offers a full range of UNIX-style commands, rather than a small subset of simple commands. Moreover, CLSH is a full-fledged scripting language that offers much more control over file management than does HDFS. To achieve comparable behavior within HDFS, the user must use either the Pig Latin tool or else use java scripting. Not only are these alternatives harder to use than CLSH, but they also perform slower and are incapable of performing certain tasks that CLSH can easily achieve. Moreover, the cloud shell environment simply provides the user with a better cloud interface; it does not preclude the use of Pig Latin or Java scripts.

Die Datensicherung stellt derzeit eine der wichtigsten Aufgaben bei der Administration von Rechnersystemen dar. Vorallem in heterogenen Netzwerken mit vielen zu verarbeitenden Daten, auch unterschiedlicher Betriebssysteme, muss die Sicherung und Rueckstellung entsprechend den technologischen und organisatorischen Bedingungen des Bereichs effektiv umgesetzt werden. Deshalb wird ein allgemeines Datensicherungskonzept definiert, nach dem die Planung und Durchfuehrung der Sicherung und Rueckstellung von Daten einschliesslich der dazu benoetigten Software und Speicherhardware organisiert werden kann. Einige Datensicherungssysteme und Speichermedien werden analysiert und fuer den Einsatz bewertet. Am Beispiel der Fakultaet fuer Informatik wird ein Technologievorschlag fuer die Organisation der Datensicherung gemacht. Zur konkreten Unterstuetzung des Systemadministrators bei der Planung und Durchfuehrung der Datensicherung werden einige Softwarewerkzeuge vorgestellt. Die Implementation erfolgte unter den Betriebsystemen MS-DOS und UNIX in Perl.

Der Vortrag stellt die Public Domain Software ¨samba¨ vor. Samba ist eine Implementation des SMB-Protokolls und wird benutzt, um Ressourcen eines UNIX-Systems, wie Filesystem-Kapazitaet und Drucker-Warteschlangen einem PC unter MS-DOS oder Windows verfuegbar zu machen. Es wird insbesondere auf die Verwendung von Samba im URZ der TU Chemnitz-Zwickau eingegangen, wo mittels Samba der Zugang zu AFS-HOME-Verzeichnissen aller Nutzer und weiteren Ressourcen ausgehend von jedem PC im Campusnetz ermoeglicht wird.