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ACM/IEEE International Symposium on Empirical Software Engineering and Measurement (ESEM)

作者： Spinellis, Diomidis Louridas, Panagiotis Kechagia, Maria Athens Univ Econ & Business Dept Management Sci & Technol Patis 76 GR-10434 Athens Greece

ISBN: (纸本)9781467378994

Context: Numerous factors drive long term progress in programming practices. Goal: We study the evolution of C programming in the unix operating system. Method: We extract, aggregate, and synthesize metrics from 66 snapshots obtained from an artificial software configuration management repository tracking the evolution of the unix operating system over four decades. Results: C language programming practices appear to evolve over long term periods;our study identified some continuous trends with highly significant coefficients of determination. Many trends point toward increasing code quality through adherence to numerous programming guidelines, while some others indicate adoption that has reached maturity. In the area of commenting progress appears to have stalled. Conclusions: Studying the long term evolution of programming practices identifies areas where progress has been achieved along an expected path, as well as cases where there is room for improvement.

关键词： C language unix C language programming practices unix operating system artificial software configuration management repository tracking coefficient-of-determination programming practices Guidelines Long Term Evolution Market research Measurement operating systems Programming unix operating system Programming Long Term Evolution C language market research operating systems evolution Evolution

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Fault Injection in the Process Descriptor of a unix-based operating system 27

Fault Injection in the Process Descriptor of a Unix-based Op...

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IEEE International Symposium on Defect and Fault Tolerance in VLSI and Nanotechnology systems (DFTS)

作者： Montrucchio, Bartolomeo Rebaudengo, Maurizio Velasco, Alejandro Politecn Torino Dipartimento Automat & Informat Turin Italy

ISBN: (纸本)9781479961559

Transient faults in computer-based systems for which high availability is a strict requirement, originated from several sources, like high energy particles, are a major issue. Fault injection is a commonly used method to evaluate the sensitivity of such systems. The paper presents an evaluation of the effects of faults in the memory containing the process descriptor of a unix-based operating system. In particular the state field has been taken into consideration as the main target, changing the current state value into another one that could be valid or invalid. An experimental analysis has been conducted on a large set of different tasks, belonging to the operating system itself. Results of tests show that the state field in the process descriptor represents a critical variable as far as dependability is considered.

关键词： unix fault diagnosis unix based operating system fault injection process descriptor transient faults Computers Fault tolerance Fault tolerant systems Kernel Virtual machining transient fault virtual machines Fault tolerant systems unix operating system Fault tolerance operating systems Computers Fault diagnosis virtual machining Kernel faults Descriptors

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A DYNAMIC C-BASED OBJECT-ORIENTED system FOR unix

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IEEE SOFTWARE 1991年第3期8卷 73-85页

作者： ENGELSTAD, S FALCK, K MONTGOMERY, W NEUMANN, J STRAUBS, R VANDENDORPE, J WILDE, M AT&T Bell Lab. USA

Calico, a C-based object-oriented language supported by an integrated software development environment, is described. Calico features strict encapsulation, dynamic binding, fast garbage collection, and interoperability with C. It provides a simple, uniformly applied object model, a syntax easily mastered by C programmers, a new multiple inheritance model, simple method-call semantics with some novel extension and effective support for the team development process. Although Calico introduces some unique language features, its primary contribution is the productivity advantage that this feature integration provides for the unix/C environment.

关键词： waste collection Interoperability Murgantia histrionica PROCESS DEVELOPMENT environment of program development unix operating system teamwork Calico language feature object orientation

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BIBLIOFILE, HUMANIZING THE unix-system

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COMPUTERS AND THE HUMANITIES 1984年第2期18卷 71-85页

作者： KINMONTH, EH 1. the University of California Davis (UCD)

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AUTO_XPL: a unix shelI-script system to sequence X-PLOR refinement runs

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JOURNAL OF APPLIED CRYSTALLOGRAPHY 1998年第3期31卷 491-495页

作者： Hunt, JF Mixon, MB Berghuis, AM Univ Texas SW Med Ctr Howard Hughes Med Inst Dallas TX 75235 USA Univ Texas SW Med Ctr Dept Biochem Dallas TX 75235 USA McMaster Univ Dept Biochem Hamilton ON L8N 3Z5 Canada

A unix shell script has been written to automate many of the individual computational steps involved in refining the crystal structure of a biopolymer using Axel Brunger's program X-PLOR. The script controls the sequential execution of different refinement operations, automatically piping the output from each operation into the input for the next operation. The performance of each individual operation is monitored in terms of the progression of the free R factor and the step is repeated with a smaller number of minimization cycles if necessary in order to achieve the lowest observed free R factor. Most refinement parameters can be adjusted or reset for each individual step, allowing long sequences of refinement operations to be executed without manual intervention. The script can also be used to automate the evaluation of the effect of variations in input-parameter values on the performance of a refinement procedure.

关键词： Free r-value Crystal-structure Accuracy R-VALUE unix shell Automation unix operating system crystal structure Refining sequential carry Biopolymers Surgery

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Using Graphviz as a Low-cost Option to Facilitate the Understanding of unix Process system Calls

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ELECTRONIC NOTES IN THEORETICAL COMPUTER SCIENCE 2009年第C期224卷 89-95页

作者： Riesco, Miguel Fondon, Marian D. Alvarez, Dairo Univ Oviedo Dept Comp Oviedo Spain

unix system calls to create and execute processes are usually hard to understand for novice students. Using graphics for visualizing the behaviour of these system calls can be useful both for the teacher to explain and for the students to understand them. The problem here is that there is no software specifically addressed to generate graphical representations of these kind of programs, and to develop it would be costly. Instead of developing a complete system to visualize programs that use unix system calls, we turned to a "cheaper" alternative solution. In this paper we show how we have used the open source graphviz tool to develop a simple way of generating graphical representations of the behaviour of these system calls, thus facilitating the comprehension of this important part in the learning of the unix operating system.

关键词： unix operating system process system calls program visualization

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High Performance Logging system for Embedded unix and GNU/Linux Applications

High Performance Logging System for Embedded UNIX and GNU/Li...

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IEEE 19th International Conference on Embedded and Real-Time Computing systems and Applications (RTCSA)

作者： Jeong, Jaein Cisco Syst San Jose CA 95134 USA

ISBN: (纸本)9781479908516

We present a high performance logging system for embedded unix and GNU/Linux applications. Compared to the standard unix and GNU/Linux logging method, syslog, our method has two orders of magnitude lower latency and an order of magnitude higher message throughput. This speed-up is mainly due to the use of a memory-mapped file as the means of interprocess communication, fewer memory copies and the batching of output messages in the logging daemon. In addition, our logging system also accepts syslog messages, providing compatibility with existing applications. Our logging system is in production use in the Cisco UCS Virtual Interface Card.

关键词： unix operating system logging mapping files BATCHES HIGH-PERFORMANCE

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unix AND THE AM29000 MICROPROCESSOR

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IEEE MICRO 1992年第1期12卷 23-31页

作者： MANN, D Advanced Micro Devices Inc. USA

Though targeted for use in medium- to high-performance embedded applications, the Am29000 includes several design provisions allowing its use in unix workstation applications. For example, a scalable interrupt-handling mechanism makes the processor particularly suited to real-time unix operations. The relevant features discussed here will help users interested in building a unix system.

关键词： point supports context switching unix operating system system call macroprocessor

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Memory channel network for PCL

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IEEE MICRO 1996年第1期16卷 12-18页

作者： Gillett, RB Digital Equipment Corporation USA

A memory-based networking approach provides clusters of computers up to 1,000 times the communication performance of conventional networks, with no compromise in cost or reliability. The memory channel for PCI\'s performance gains are the result of a system design approach that exploits natural cluster constraints to define a memory-based network. MC implements a form of virtual shared memory that permits applications to completely bypass the operating system and perform cluster communication directly from the user level. The hardware\'s simple and powerful communication model supports error handling at almost no cost or complexity to the application; guaranteed ordering under errors is the key innovation. The end result: Real-world cluster communication latency dropped by up to two orders of magnitude, and overhead by up to three orders of magnitude. These improvements elevate a lowly set of standard PCI computers running unix into an impressive, highly available, parallel computing system.

关键词： protocol control information Communication Research Computers error handling unix operating system Virtual Shared Memory memory channel operating systems user class

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HERA-B higher-level triggers: architecture and software

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 1998年第1期408卷 173-180页

作者： Gellrich, A Medinnis, M DESY Zeuthen D-15738 Zeuthen Germany

HERA-B will be studying CP-violation in the B-system in a high-rate hadronic environment. To accomplish this goal, HERA-B needs a sophisticated data acquisition and trigger system. Except for the first level, all trigger levels are implemented as PC-farms, running the unix-like operating system, Linux, thus blurring the sharp border between online and offline application software. The hardware architecture and software environments are discussed. (C) 1998 Elsevier Science B.V. All rights reserved.

关键词： ARCHITECTURE Building construction TRIGGERS computer programs ERAL1 gene unix operating system trigger level computer software

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