Getting Started with Bdspro™
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DVCS Or a New Way to Use Version Control Systems for Freebsd
Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions DVCS or a new way to use Version Control Systems for FreeBSD Ollivier ROBERT <[email protected]> BSDCan 2006 Ottawa, Canada May, 12-13th, 2006 Ollivier ROBERT <[email protected]> DVCS or a new way to use Version Control Systems for FreeBSD Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions Agenda 1 Brief history of VCS 2 FreeBSD context & gures 3 Is Arch/baz suited for FreeBSD? 4 Mercurial to the rescue 5 New processes & policies needed 6 Conclusions Ollivier ROBERT <[email protected]> DVCS or a new way to use Version Control Systems for FreeBSD Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions The ancestors: SCCS, RCS File-oriented Use a subdirectory to store deltas and metadata Use lock-based architecture Support shared developments through NFS (fragile) SCCS is proprietary (System V), RCS is Open Source a SCCS clone exists: CSSC You can have a central repository with symlinks (RCS) Ollivier ROBERT <[email protected]> DVCS or a new way to use Version Control Systems for FreeBSD Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions CVS, the de facto VCS for the free world Initially written as shell wrappers over RCS then rewritten in C Centralised server Easy UI Use sandboxes to avoid locking Simple 3-way merges Can be replicated through CVSup or even rsync Extensive documentation (papers, websites, books) Free software and used everywhere (SourceForge for example) Ollivier ROBERT <[email protected]> DVCS or a new way to use Version Control Systems for FreeBSD Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions CVS annoyances and aws BUT.. -
Everything You Need to Know About Openjdk's Move to Git and Github
Menu Topics Archives Downloads Subscribe Everything you need to know JAVA 17 about OpenJDK’s move to Git and GitHub Everything you need to know Blame or thank BitKeeper about OpenJDK’s move to Git Why not Mercurial? and GitHub Why Git? Why GitHub? Why the move, and why now? The move from Mercurial to Git Getting the source code and provided an opportunity to consolidate building the OpenJDK the source code repositories. Conclusion by Ian Darwin Dig deeper May 14, 2021 Download a PDF of this article Have you ever built your own Java Development Kit from source? Most end users of the JDK will not need to build their own JDK from the Oracle source code. I’ve needed to do that only a few times when I was running on the OpenBSD UNIX-like system, which is not one of the three supported platforms. Sure, you might want to build your own JDK to try out a new feature that you think should be added to Java. You might choose to build from source to be sure you are running a more trustworthy binary. Having the complete source code readily available, and now in a more commonly used download format, means it is easier than ever to build your own JDK. Yes, it’s a better-documented, easily configured process than in the past. But it’s still a bit confusing. The source code for the OpenJDK recently moved from the Mercurial version control system (VCS) to the Git VCS and the GitHub repository system, and that’s probably a good thing. -
Version Control
Version Control Consider the following simple scenario: • a software system contains a source code file x.c • system is worked on by several teams of programmers • Ann in Sydney adds a new feature in her copy of x.c • Bob in Singapore fixes a bug in his copy of x.c Ultimately, we need to ensure that • all changes are properly recorded (when, who, why) • both the new feature and the bug fix are in the next release • if we later find bugs in old release, they can be fixed Version Control Systems A version control system allows software developers to: • work simultaneously and coperatively on a system • document when, who, & why changes made • discuus and approve changes • recreate old versions of a system when needed • multiple versions of system can be distributed, tested, merged This allows change to be managed/controlled in a systematic way. VCSs also try to minimise resource use in maintaining multiple versions. Unix VCS - Generation 1 (Unix) 1970’s ... SCCS (source code control system) • first version control system • centralized VCS - single central repository • introduced idea of multiple versions via delta’s • single user model: lock - modify - unlock • only one user working on a file at a time 1980’s ... RCS (revision control system) • similar functionality to SCCS (essentially a clean open-source re-write of SCCS) • centralized VCS - single central repository • single user model: lock - modify - unlock • only one user working on a file at a time • still available and in use Unix VCS - Generation 2 (Unix) 1990 ... CVS (concurrent version system) • centralized VCS - single central repository • locked check-out replaced by copy-modify-merge model • users can work simultaneously and later merge changes • allows remote development essential for open source projects • web-accessible interface promoted wide-dist projects • poor handling of file metadata, renames, links Early 2000’s .. -
Chapter 1 - Describing Open Source & Free Software Communities
PROTECTING THE VIRTUAL COMMONS Self-organizing open source and free software communities and innovative intellectual property regimes Ruben van Wendel de Joode Hans de Bruijn Michel van Eeten Delft September 2002 Draft version (official version to be published by Asser Press in 2003) For questions, suggestions or comments please contact: Ruben van Wendel de Joode at [email protected] © 2002 Ruben van Wendel de Joode, Hans de Bruijn and Michel van Eeten Table of contents ACKNOWLEDGEMENTS..............................................................................................5 INTRODUCTION.............................................................................................................6 Questions guiding the research...................................................................................6 Structure of the report .................................................................................................7 CHAPTER 1 - DESCRIBING OPEN SOURCE & FREE SOFTWARE COMMUNITIES...............................................................................................................9 1.1 - INTRODUCTION........................................................................................................9 1.2 - POPULARITY OF OPEN SOURCE AND FREE SOFTWARE.............................................9 1.3 - HISTORICAL DEVELOPMENT OF OPENNESS & FREEDOM.......................................11 The origin of the Internet ..........................................................................................11 Richard -
Designing a Fast Index Format for Git
Free University of Bolzano - Bozen Bachelor Thesis Designing a Fast Index Format for Git Author: Supervisor: Thomas Gummerer Dr. Johann Gamper A thesis submitted in fulfillment of the requirements for the degree of Bachelor in Computer Science in July 2013 Contents List of Figures iv Abstract v 1 Introduction1 1.1 Motivation...................................1 1.2 Problem Description and Objectives.....................2 1.3 Organization of the Thesis...........................2 2 Related Work4 2.1 Version Control Systems............................4 2.2 Types of Version Control Systems.......................4 2.3 Git........................................5 3 A New Index for Git7 3.1 The Git Index File...............................7 3.2 Index v2.....................................8 3.3 The New Index File Format v5........................ 11 4 Implementation 15 4.1 Convert Index.................................. 15 4.2 Read Index................................... 15 4.3 Internal Implementation............................ 16 4.4 New In-memory Format............................ 18 4.5 Index Reading API............................... 19 4.6 Writing the New Index Format........................ 20 5 Discussion 22 5.1 Alternative Solutions.............................. 22 5.1.1 B-tree Format............................. 22 5.1.2 Append-only Data Structure..................... 22 5.1.3 Database Format............................ 23 5.1.4 Padded Structure............................ 23 5.2 Discussion.................................... 24 6 -
SCO Openserver Handbook Changing the Default Editor
SCO OpenServer Handbook How to configure and start using an SCO OpenServer system 1983-2003 Caldera International, Inc. All rights reserved. This publication is protected under copyright laws and international treaties. 1976-2001 The Santa Cruz Operation, Inc.; 1989-1994 Acer Incorporated; 1989-1994 Acer America Corporation; 1990-1994 Adaptec, Inc.; 1993 Advanced Micro Devices, Inc.; 1990 Altos Computer Systems; 1992-1994 American Power Conversion, Inc.; 1988 Archive Corporation; 1990 ATI Technologies, Inc.; 1976-1992 AT&T; 1992-1994 AT&T Global Information Solutions Company; 1993 Berkeley Network Software Consortium; 1985-1986 Bigelow & Holmes; 1988-1991 Carnegie Mellon University; 1989-1990 Cipher Data Products, Inc.; 1985-1992 Compaq Computer Corporation; 1987-1994 Computer Associates, Inc.; 1986-1987 Convergent Technologies, Inc.; 1990-1993 Cornell University; 1985-1994 Corollary, Inc.; 1990-1994 Distributed Processing Technology; 1991 D.L.S. Associates; 1990 Free Software Foundation, Inc.; 1989-1991 Future Domain Corporation; 1994 Isogon Corporation; 1991 Hewlett-Packard Company; 1994 IBM Corporation; 1990-1993 Intel Corporation; 1989 Irwin Magnetic Systems, Inc.; 1988-1991 JSB Computer Systems Ltd.; 1989-1994 Dirk Koeppen EDV- Beratungs-GmbH; 1989-1991 Massachusetts Institute of Technology; 1985-1992 Metagraphics Software Corporation; 1980-1994 Microsoft Corporation; 1984-1989 Mouse Systems Corporation; 1989 Multi-Tech Systems, Inc.; 1991 National Semiconductor Corporation; 1990 NEC Technologies, -
Iron File Systems
IRON FILE SYSTEMS by Vijayan Prabhakaran B.E. Computer Sciences (Regional Engineering College, Trichy, India) 2000 M.S. Computer Sciences (University of Wisconsin-Madison) 2003 A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Computer Sciences University of Wisconsin-Madison 2006 Committee in charge: Andrea C. Arpaci-Dusseau (Co-chair) Remzi H. Arpaci-Dusseau (Co-chair) David J. DeWitt Mary K. Vernon Mikko H. Lipasti ii iv v Abstract IRON FILE SYSTEMS Vijayan Prabhakaran Disk drives are widely used as a primary medium for storing information. While commodity file systems trust disks to either work or fail completely, modern disks exhibit complex failure modes such as latent sector faults and block corrup- tions, where only portions of a disk fail. In this thesis, we focus on understanding the failure policies of file systems and improving their robustness to disk failures. We suggest a new fail-partial failure model for disks, which incorporates realistic localized faults such as latent sector faults and block corruption. We then develop and apply a novel semantic failure analysis technique, which uses file system block type knowledge and transactional semantics, to inject interesting faults and investigate how commodity file systems react to a range of more realistic disk failures. We apply our technique to five important journaling file systems: Linux ext3, ReiserFS, JFS, XFS, and Windows NTFS. We classify their failure policies in a new taxonomy that measures their Internal RObustNess (IRON), which includes both failure detection and recovery techniques. Our analysis results show that commod- ity file systems store little or no redundant information, and contain failure policies that are often inconsistent, sometimes buggy, and generally inadequate in their abil- ity to recover from partial disk failures. -
Lmbench: Portable Tools for Performance Analysis
The following paper was originally published in the Proceedings of the USENIX 1996 Annual Technical Conference San Diego, California, January 1996 lmbench: Portable Tools for Performance Analysis Larry McVoy, Silicon Graphics Carl Staelin, Hewlett-Packard Laboratories For more information about USENIX Association contact: 1. Phone: 510 528-8649 2. FAX: 510 548-5738 3. Email: [email protected] 4. WWW URL: http://www.usenix.org lmbench: Portable tools for performance analysis Larry McVoy Silicon Graphics, Inc. Carl Staelin Hewlett-Packard Laboratories Abstract of this benchmark suite obsolete or irrelevant. lmbench is a micro-benchmark suite designed to lmbench is already in widespread use at many focus attention on the basic building blocks of many sites by both end users and system designers. In some common system applications, such as databases, simu- cases, lmbench has provided the data necessary to lations, software development, and networking. In discover and correct critical performance problems almost all cases, the individual tests are the result of that might have gone unnoticed. lmbench uncovered analysis and isolation of a customer’s actual perfor- a problem in Sun’s memory management software that mance problem. These tools can be, and currently are, made all pages map to the same location in the cache, used to compare different system implementations effectively turning a 512 kilobyte (K) cache into a 4K from different vendors. In several cases, the bench- cache. marks have uncovered previously unknown bugs and lmbench measures only a system’s ability to design flaws. The results have shown a strong correla- transfer data between processor, cache, memory, net- tion between memory system performance and overall work, and disk. -
Sborník Příspěvků
Česká společnost uživatelů otevřených systémů EurOpen.CZ Czech Open System Users’ Group www.europen.cz 34. konference Sborník příspěvků Sport Hotel Kurzovní Praděd 17.–20. května 2009 Programový výbor Vladimír Rudolf, Západočeská univerzita v Plzni Jakub Urbanec, HP Praha Václav Pergl, Kerio Technologies Sborník příspěvků z 34. konference EurOpen.CZ, 17.–20. května 2009 c EurOpen.CZ, Univerzitní 8, 306 14 Plzeň Plzeň 2009. První vydání. Editor: Vladimír Rudolf Sazba a grafická úprava: Ing. Miloš Brejcha – Vydavatelský servis, Plzeň e-mail: [email protected] Tisk: Typos, tiskařské závody, s. r. o. Podnikatelská 1 160/14, Plzeň Upozornění: Všechna práva vyhrazena. Rozmnožování a šíření této publikace jakýmkoliv způ- sobem bez výslovného písemného svolení vydavatele je trestné. Příspěvky neprošly redakční ani jazykovou úpravou. ISBN 978-80-86583-16-7 34. konference EurOpen.CZ 3 Obsah Michal Švamberg Xen ................................................................ 5 Pavel Tůma Další krok ke konvergenci sítí – ENUM ............................. 13 Ondřej Surý DNSSEC ........................................................... 19 Tomáš Košňar Benefity a úskalí plošného souvislého sledování IP provozu na bázi toků při řešení bezpečnostních hlášení .............................. 23 Martin Zich Data Leak Prevention/Data Loss Protection ........................ 39 Radoslav Bodó Jak se smaží zásobník .............................................. 53 Jan Ježek Link load balancing i pro BFU ..................................... 65 Aleš -
The Measured Performance of Personal Computer Operating Systems
The Measured Performance of Personal Computer Operating Systems J. Bradley Chen, Yasuhiro Endo, Kee Chan, David Mazi&res Antonio Dias, Margo Seltzer, and Michael D. Smith Division of Applied Sciences Harvard University Abstract dews. The differences between the OS platforms used in research and mainstream OS products makes some systems research mrele- This paper presents a comparative study of the performance of vant with respect to the current needs of the software industry. At three operating systems that run on the personal computer archi- the same time, researchers ignore important problems in non- tecture derived from the IBM-PC, The operating systems, Win- UNIX systems. dows for Workgroups, Windows NT, and NetBSD (a freely The operating system most commonly used on PC platforms available variant of the UNIX operating system), cover a broad is Microsoft Windows. Windows lacks many features that the OS range ofs ystem functionalist y and user requirements, from a single research community takes for granted, most notably preemptive address space model to full protection with preemptive multi-task- multitasking and protected address spaces. New operating systems ing. Our measurements were enabled by hardware counters in for the PC market such as Windows NT and 0S/2 incorporate the Intel’s Pentium processor that permit measurement of a broad multitasking support found in modern UNIX operating systems, range of processor events including instruction counts and on-chip while also supporting Windows applications. Though the operat- cache miss counts. We used both microbenchmarks, which expose ing systems community is familiar with the benefits of features specific differences between the systems, and application work- such as separate protected address spaces, little attention has been loads, which provide an indication of expected end-to-end perfor- given to systems without them. -
Performance Evaluation of Commodity Systems for Cluster Computing
Performance Evaluation of Commodity Systems for Cluster Computing Imed Chihi <[email protected]> December 4, 2003 1 Abstract The rise of the Personal Computer has dramatically changed the modern computer scene. Along with the proliferation of commodity networks, a new breed of computing was born: Parallel Distributed Processing. The large distribution of commodity components caused a huge drop in prices even for some high end machines. Some research work explored the case of using a collection of machines linked by a network as one single processing facility, one major outcome of these tendencies was the Scientific Computing Cluster. The emergence of free, low cost and fast operating systems like Linux and FreeBSD has accelerated these tendencies. This work attempts to explore the capabilities of a single processing node. A special emphasis is put on I/O sub-systems for we believe they are the determinant metrics for the performance of the modern scientific workloads. We study the case of the Intel x86 machines, Ethernet networks and the Linux operating systems: the de facto commodity components. We present a short summary of some related research and industry efforts that deal closely with our topic, then we present some architectural details that would help in the appreciation of later measurements, next we present the operating system as the major software component driving a cluster. A couple of chapters are dedicated to some in-depth study of the storage and network IO subsystems with interesting findings. Keywords Operating systems, Clusters, High-performance computing, Unix, Linux, Benchmark, Scientific computing, File system, Zero-copy. -
A Prologue of Git and SVN
International Journal of Engineering and Advanced Technology (IJEAT) ISSN: 2249 – 8958, Volume-9 Issue-1, October 2019 A Prologue of Git and SVN Karthik Pai B H, Vasudeva Pai, Devidas, Deeksh S N, Rahul Rao Abstract: Version Control Software or Revision Control In most of the software development, certain modification Software are the most important things in the world of software can unveil new bugs on its own and the new software development. In this paper, we have described two version control cannot be trustworthy until it's tested. So development and tools: Git and Apache Subversion. Git comes as free and open testing advance simultaneously until an improved version source code management and version control system which is is available. disseminated with the GNU general public license. Apache Git is one among the good version control tool which is Subversion abbreviated as SVN is one amongst a software versioning and revision control systems given as open source booming in the current market. The noticeable features are: under Apache License. Git design, its functionality, and usage of It is a stable support system for non-linear development, it Git and SVN are discussed in this paper. The goal of this has distributed repository structure, It makes a good research paper is to accentuate on GIT and SVN tools, evaluate compatible bond with present technology and various and compare five version control tools to ascertain their usage protocols like Hyper Text Transfer Protocol, File Transfer and efficacy. Protocol, It can handle the projects of any size varying from small or very large, History has Cryptographic Keywords : Control tools, Git, SVN, Version Control authentication, merge strategies are Pluggable, Design is toolkit based, Periodic explicit object packing, Garbage will I.