The Good, the Bad, and the Ugly?
|
|
|
- Augustine Roberts
- 5 years ago
- Views:
Transcription
1 Corporate Technology The Good, the Bad, and the Ugly? Structure and Trends of Open Unix Kernels Dr. Wolfgang Mauerer, Siemens AG, CT SE 2 Corporate Competence Centre Embedded Linux wolfgang.mauerer@siemens.com Page 1 October 29, 2009 W. Mauerer Corporate Technology SE 2
2 Overview 1 Introduction 2 Evaluated Systems 3 Feature Comparison 4 Quantitative Measurements Code Shape Complexity Size Matters Dynamics 5 Summary Page 2 October 29, 2009 W. Mauerer Corporate Technology SE 2
3 Outline 1 Introduction 2 Evaluated Systems 3 Feature Comparison 4 Quantitative Measurements Code Shape Complexity Size Matters Dynamics 5 Summary Page 3 October 29, 2009 W. Mauerer Corporate Technology SE 2
4 Introduction Observations Users won t really notice different kernel underneath their systems (spark plugs!) Developers will mostly neither. Questions Why so many different kernels? How do they differ? Quantitative assessment possible? Which one s the best kernel? Page 4 October 29, 2009 W. Mauerer Corporate Technology SE 2
5 Introduction Observations Users won t really notice different kernel underneath their systems (spark plugs!) Developers (except system and spark plug developers) will mostly neither. Questions Why so many different kernels? How do they differ? Quantitative assessment possible? Which one s the best kernel? Page 4 October 29, 2009 W. Mauerer Corporate Technology SE 2
6 Introduction Observations Users won t really notice different kernel underneath their systems (spark plugs!) Developers (except system and spark plug developers) will mostly neither.? Questions Why so many different kernels? How do they differ? Quantitative assessment possible? Which one s the best kernel? Page 4 October 29, 2009 W. Mauerer Corporate Technology SE 2
7 Introduction Observations Users won t really notice different kernel underneath their systems (spark plugs!) Developers (except system and spark plug developers) will mostly neither.? Questions Why so many different kernels? How do they differ? Quantitative assessment possible? Which one s the best kernel? Page 4 October 29, 2009 W. Mauerer Corporate Technology SE 2
8 Outline 1 Introduction 2 Evaluated Systems 3 Feature Comparison 4 Quantitative Measurements Code Shape Complexity Size Matters Dynamics 5 Summary Page 5 October 29, 2009 W. Mauerer Corporate Technology SE 2
9 Evaluated Systems: Linux and OpenSolaris Started: 1991 License: GPL Version Control: GIT Started: 2008 (1991) License: CDDL Version Control: Mercurial Page 6 October 29, 2009 W. Mauerer Corporate Technology SE 2
10 The BSD family Started: 1993 License: BSD Version Control: Subversion Started: 1991 License: BSD Version Control: CVS Started: 1996 (1991) License: BSD Version Control: CVS Page 7 October 29, 2009 W. Mauerer Corporate Technology SE 2
11 Outline 1 Introduction 2 Evaluated Systems 3 Feature Comparison 4 Quantitative Measurements Code Shape Complexity Size Matters Dynamics 5 Summary Page 8 October 29, 2009 W. Mauerer Corporate Technology SE 2
12 Unbiased? No flame wars intended... Page 9 October 29, 2009 W. Mauerer Corporate Technology SE 2
13 Feature Comparison Commonplaces Yes, OpenSolaris focusses on tracing, zones, and ZFS Yes, Linux still focusses on... everything Yes, NetBSD is really about multi-arch support Yes, OpenBSD is about security and paranoia Yes, FreeBSD would like Linux s device drivers Alternatives Performance testing Tick list on Wikipedia Page 10 October 29, 2009 W. Mauerer Corporate Technology SE 2
14 Feature Comparison Commonplaces Yes, OpenSolaris focusses on tracing, zones, and ZFS Yes, Linux still focusses on... everything Yes, NetBSD is really about multi-arch support Yes, OpenBSD is about security and paranoia Yes, FreeBSD would like Linux s device drivers Alternatives Performance testing Tick list on Wikipedia Page 10 October 29, 2009 W. Mauerer Corporate Technology SE 2
15 Feature Comparison Commonplaces Yes, OpenSolaris focusses on tracing, zones, and ZFS Yes, Linux still focusses on... everything Yes, NetBSD is really about multi-arch support Yes, OpenBSD is about security and paranoia Yes, FreeBSD would like Linux s device drivers Alternatives Performance testing Tick list on Wikipedia Page 10 October 29, 2009 W. Mauerer Corporate Technology SE 2
16 Feature Comparison Commonplaces Yes, OpenSolaris focusses on tracing, zones, and ZFS Yes, Linux still focusses on... everything Yes, NetBSD is really about multi-arch support Yes, OpenBSD is about security and paranoia Yes, FreeBSD would like Linux s device drivers Alternatives Performance testing Tick list on Wikipedia Page 10 October 29, 2009 W. Mauerer Corporate Technology SE 2
17 Feature Comparison Commonplaces Yes, OpenSolaris focusses on tracing, zones, and ZFS Yes, Linux still focusses on... everything Yes, NetBSD is really about multi-arch support Yes, OpenBSD is about security and paranoia Yes, FreeBSD would like Linux s device drivers Alternatives Performance testing Tick list on Wikipedia Page 10 October 29, 2009 W. Mauerer Corporate Technology SE 2
18 Feature Comparison Commonplaces Yes, OpenSolaris focusses on tracing, zones, and ZFS Yes, Linux still focusses on... everything Yes, NetBSD is really about multi-arch support Yes, OpenBSD is about security and paranoia Yes, FreeBSD would like Linux s device drivers Alternatives Performance testing Tick list on Wikipedia Page 10 October 29, 2009 W. Mauerer Corporate Technology SE 2
19 Outline 1 Introduction 2 Evaluated Systems 3 Feature Comparison 4 Quantitative Measurements Code Shape Complexity Size Matters Dynamics 5 Summary Page 11 October 29, 2009 W. Mauerer Corporate Technology SE 2
20 Quantitative measurements Quantitative!= Useful Formal complexity vs. real complexity Line counting == bean counting? Reliability of direct comparisons? Question Can measurements provide meaningful insights? Page 12 October 29, 2009 W. Mauerer Corporate Technology SE 2
21 Quantitative measurements Quantitative!= Useful Formal complexity vs. real complexity Line counting == bean counting? Reliability of direct comparisons? Question Can measurements provide meaningful insights? Page 12 October 29, 2009 W. Mauerer Corporate Technology SE 2
22 Code Shape Page 13 October 29, 2009 W. Mauerer Corporate Technology SE 2
23 Code Shape: Composition Drivers Architectures Headers Core Docs FS MM Net Others Size [MiB] Linux FreeBSD NetBSD OpenBSD OpenSolaris Page 14 October 29, 2009 W. Mauerer Corporate Technology SE 2
24 Code Shape: Composition Relative Weight Drivers Architectures Headers Core Docs FS MM Net Others Linux FreeBSD NetBSD OpenBSD OpenSolaris Page 14 October 29, 2009 W. Mauerer Corporate Technology SE 2
25 Code shape: Measurements Measurements Line counts for Input Blanks Comments Preprocessor Statements Declarative/executable instructions Measured per File Function Structure/Union Measured over 5 years of history Page 15 October 29, 2009 W. Mauerer Corporate Technology SE 2
26 Code Shape: Linux Ratio Core Kernel and Memory Management Comments to Code (mm) Preprocessor to Code (mm) Comments to Code (core) Preprocessor to Code (core) Ratio File System and Device Drivers Comments to Code (drivers) Preprocessor to Code (drivers) Comments to Code (fs) Preprocessor to Code (fs) Kernel Release Kernel Release Page 16 October 29, 2009 W. Mauerer Corporate Technology SE 2
27 Code Shape: FreeBSD Ratio Core Kernel and Memory Management Comments to Code (mm) Preprocessor to Code (mm) Comments to Code (core) Preprocessor to Code (core) Ratio File System and Device Drivers Comments to Code (drivers) Preprocessor to Code (drivers) Comments to Code (fs) Preprocessor to Code (fs) Kernel Release Kernel Release Page 17 October 29, 2009 W. Mauerer Corporate Technology SE 2
28 Code Shape: Results Pattern: Documentation Memory Management Filesystems < Core Kernel Device Drivers Pattern: Preprocessor Use Comparable between subsystems of kernels OpenBSD, NetBSD: More tendency towards preprocessor Exception: OpenSolaris Very little preprocessor use Documentation: core < fs drivers < mm Page 18 October 29, 2009 W. Mauerer Corporate Technology SE 2
29 Code Shape: Results Pattern: Documentation Memory Management Filesystems < Core Kernel Device Drivers Pattern: Preprocessor Use Comparable between subsystems of kernels OpenBSD, NetBSD: More tendency towards preprocessor Exception: OpenSolaris Very little preprocessor use Documentation: core < fs drivers < mm Page 18 October 29, 2009 W. Mauerer Corporate Technology SE 2
30 Code Shape: Results Pattern: Documentation Memory Management Filesystems < Core Kernel Device Drivers Pattern: Preprocessor Use Comparable between subsystems of kernels OpenBSD, NetBSD: More tendency towards preprocessor Exception: OpenSolaris Very little preprocessor use Documentation: core < fs drivers < mm Page 18 October 29, 2009 W. Mauerer Corporate Technology SE 2
31 Complexity Page 19 October 29, 2009 W. Mauerer Corporate Technology SE 2
32 Complexity Measures Complexities Cyclomatic complexity Essential complexity Maximal nesting Maximal essential knots Henry-Kafura Information Flow Page 20 October 29, 2009 W. Mauerer Corporate Technology SE 2
33 Complexity: Comparison of measures avgcyclomatic avgcyclomaticmodified avgcyclomaticstrict avgessential avgknots Complexity Measure Kernel Release Similar picture for other systems Long-term behaviour, not absolute numbers important Page 21 October 29, 2009 W. Mauerer Corporate Technology SE 2
34 Complexity: NetBSD 9 8 avgcyclomaticmodified (core) avgessential (core) avgcyclomaticmodified (mm) avgessential (mm) avgcyclomaticmodified (fs) avgessential (fs) avgcyclomaticmodified (drivers) avgessential (drivers) Complexity Measure Complexity Measure Kernel Release Kernel Release Discontinuities and Flips! Page 22 October 29, 2009 W. Mauerer Corporate Technology SE 2
35 Complexity: OpenBSD 9 8 avgcyclomaticmodified (core) avgessential (core) avgcyclomaticmodified (mm) avgessential (mm) avgcyclomaticmodified (fs) avgessential (fs) avgcyclomaticmodified (drivers) avgessential (drivers) Complexity Measure Kernel Release Complexity Measure Kernel Release Discontinuities and Flips! Page 23 October 29, 2009 W. Mauerer Corporate Technology SE 2
36 Complexity: Interpretation Interpretation? Hard to attribute discontinuous jumps to specific causes Similar relations between subsystems Further averaging required Complexity ordering Let A, B denote subsystems. Define ordering (with c ]0.5, 1]): A B 1 #M #R r R m M Θ(m(B r ) m(a r )) c Page 24 October 29, 2009 W. Mauerer Corporate Technology SE 2
37 Complexity: Interpretation Interpretation? Hard to attribute discontinuous jumps to specific causes Similar relations between subsystems Further averaging required Complexity ordering Let A, B denote subsystems. Define ordering (with c ]0.5, 1]): A B 1 #M #R r R m M Θ(m(B r ) m(a r )) c Page 24 October 29, 2009 W. Mauerer Corporate Technology SE 2
38 Complexity Ordering: Results Linux OpenSolaris OpenBSD NetBSD FreeBSD Fail Pass Fail Pass Fail Pass Fail Pass Fail Pass Hypothesis Core MM MM FS. Page 25 October 29, 2009 W. Mauerer Corporate Technology SE 2
39 Size Matters Page 26 October 29, 2009 W. Mauerer Corporate Technology SE 2
40 Size Matters: OpenBSD Size [MiB] 4 3 Core Memory Management Networking Size [MiB] Drivers Filesystems Architecture Support Kernel Version Kernel Version Results Discontinuities attributable to specific causes Per-subsystem consideration required Linear vs. superlinear Page 27 October 29, 2009 W. Mauerer Corporate Technology SE 2
41 Size Matters: Linux Size [MiB] Core Memory Management Networking Size [MiB] Drivers Filesystems Architecture Support Kernel Version Kernel Version Results Discontinuities attributable to specific causes Per-subsystem consideration required Linear vs. superlinear Page 27 October 29, 2009 W. Mauerer Corporate Technology SE 2
42 Size Matters Size [MiB] Core Memory Management Networking Size [MiB] Drivers Filesystems Architecture Support Kernel Version Kernel Version Results Discontinuities attributable to specific causes Per-subsystem consideration required Linear vs. superlinear Page 27 October 29, 2009 W. Mauerer Corporate Technology SE 2
43 Dynamics Page 28 October 29, 2009 W. Mauerer Corporate Technology SE 2
44 Dynamics of development Global analysis: Traditional method VCSs allow decomposition to patch level Good time resolution essential Page 29 October 29, 2009 W. Mauerer Corporate Technology SE 2
45 Dynamics: Linux Changes # lines affected Kernel Release (Well known from lwn.net and the Linux foundation) Page 30 October 29, 2009 W. Mauerer Corporate Technology SE 2
46 Dynamics: Linux # lines affected Insertions Deletions Sum Kernel Release (Well known from lwn.net and the Linux foundation) Page 30 October 29, 2009 W. Mauerer Corporate Technology SE 2
47 Dynamics: FreeBSD Insertions (Release) Deletions (Release) Both (Release) Insertions (Head) Deletions (Head) Both (Head) # lines affected Kernel Release Page 31 October 29, 2009 W. Mauerer Corporate Technology SE 2
48 Dynamics: NetBSD Changes # lines affected Insertions Deletions Both # lines affected Kernel Release Kernel Release Page 32 October 29, 2009 W. Mauerer Corporate Technology SE 2
49 Dynamics: OpenBSD # lines affected Changes # lines affected Insertions Deletions Both Kernel Release Kernel Release Page 33 October 29, 2009 W. Mauerer Corporate Technology SE 2
50 Dynamics: OpenSolaris # lines affected Changes on124 on120 on115 on110 on105 on100 on95 on90 on85 on80 on75 on70 on65 on60 on55 on50 on45 on40 on35 on30 on25 on20 # lines affected Insertions Deletions Sum on124 on120 on115 on110 on105 on100 on95 on90 on85 on80 on75 on70 on65 on60 on55 on50 on45 on40 on35 on30 on25 on20 Kernel Release Kernel Release Page 34 October 29, 2009 W. Mauerer Corporate Technology SE 2
51 Dynamics: Comparison Linux FreeBSD NetBSD OpenBSD OpenSolaris Cumulative Changes # lines affected Time [days] Page 35 October 29, 2009 W. Mauerer Corporate Technology SE 2
52 Dynamics: Comparison Linux FreeBSD NetBSD OpenBSD OpenSolaris Cumulative Changes # lines affected Time [days] Conclusions VCS: Key influence on dynamics Linear vs. superlinear: Relevant? Maintainability criteria don t match reality Page 35 October 29, 2009 W. Mauerer Corporate Technology SE 2
53 Outline 1 Introduction 2 Evaluated Systems 3 Feature Comparison 4 Quantitative Measurements Code Shape Complexity Size Matters Dynamics 5 Summary Page 36 October 29, 2009 W. Mauerer Corporate Technology SE 2
54 Summary Single static snapshots Dynamics Metrics Version Control Maintainability Indices Quantitative similarities Documentation, Preprocessor patterns Complexity relationships Page 37 October 29, 2009 W. Mauerer Corporate Technology SE 2
55 Thank you for listening! Page 38 October 29, 2009 W. Mauerer Corporate Technology SE 2
CS307 Operating Systems Introduction Fan Wu
CS307 Introduction Fan Wu Department of Computer Science and Engineering Shanghai Jiao Tong University Spring 2018 2 UNIX-family: BSD(Berkeley Software Distribution), System-V, GNU/Linux, MINIX, Nachos,
README for X11R7.5. The X.Org Foundation 1. October 2009
The X.Org Foundation 1 October 2009 X11R7.5 is an Open Source version of the X Window System that supports many UNIX and UNIX-like operating systems (such as Linux, FreeBSD, NetBSD, OpenBSD, and Solaris)
What s next. Computer Systems A Programmer s Perspective
What s next Computer Systems A Programmer s Perspective 198 The role of the operating system Protect the computer from misuse Provide an abstraction for using the hardware so that programs can be written
Using git to download and update BOUT++
ER Meeting 14th Sept 2015 1/28 Using git to download and update BOUT++ Peter Hill ER Meeting 14th Sept 2015 2/28 Outline What is git? Getting git Basic git usage Getting BOUT++ Compiling BOUT++ Running
FreeBSD Jails vs. Solaris Zones
FreeBSD Jails vs. Solaris Zones (and OpenSolaris) James O Gorman james@netinertia.co.uk Introduction FreeBSD user since 4.4-RELEASE Started using Solaris ~3.5 years ago Using jails for website hosting
Version control system (VCS)
Version control system (VCS) Remember that you are required to keep a process-log-book of the whole development solutions with just one commit or with incomplete process-log-book (where it is not possible
Intro to Analytics Learning Web Analytics
Intro to Analytics 100 - Learning Web Analytics When you hear the word analytics, what does this mean to you? Analytics is the discovery, interpretation and communication of meaningful patterns in data.
Kernel Types Simple OS Examples System Calls. Operating Systems. Autumn CS4023
Operating Systems Autumn 2017-2018 Outline 1 2 3 Types of 2.4, SGG The OS Kernel The kernel is the central component of an OS It has complete control over everything that occurs in the system Kernel overview
A Practical Introduction to Version Control Systems
A Practical Introduction to Version Control Systems A random CAKES(less) talk on a topic I hope others find useful! a.brampton@lancs.ac.uk 4th February 2009 Outline 1 What is Version Control Basic Principles
Image Compression With Haar Discrete Wavelet Transform
Image Compression With Haar Discrete Wavelet Transform Cory Cox ME 535: Computational Techniques in Mech. Eng. Figure 1 : An example of the 2D discrete wavelet transform that is used in JPEG2000. Source:
Getting Started with Team Coding Applicable to Toad for Oracle Suite 2016 (v12.9) and higher
Getting Started with Team Coding Applicable to Toad for Oracle Suite 2016 (v12.9) and higher John Bowman Toad for Oracle Development Table of Contents About Team Coding... 2 Working with a Version Control
Why BSD? Michael W Lucas
Why BSD? Michael W Lucas https://mwl.io Who I Am? Author Unix since 198(mumble), sysadmin since 1995 Founding member of SouthEast Michigan BSD User Group, semibug.org Blatant BSD demagogue Author of many
Comparison between SLOCs and number of files as size metrics for software evolution analysis 1
Comparison between SLOCs and number of files as size metrics for software evolution analysis 1 Comparison between SLOCs and number of files as size metrics for software evolution analysis Israel Herraiz,
Morningstar Direct SM Equity Attribution
Equity attribution, also known as micro attribution, compares a portfolio s performance to that of a benchmark by decomposing the excess return to explain the impact of various investment decisions. Analyze
Using Machine Learning to Optimize Storage Systems
Using Machine Learning to Optimize Storage Systems Dr. Kiran Gunnam 1 Outline 1. Overview 2. Building Flash Models using Logistic Regression. 3. Storage Object classification 4. Storage Allocation recommendation
CS Operating Systems
CS 447 - Operating Systems Syllabus Assignments -- Uses Blitz (facultyweb.cs.wwu.edu/~phil/classes/blitz) Environment UNIX (Linux, OS X, NetBSD, FreeBSD...) Should be the same since Blitz is a Virtual
Using a VMware Network Infrastructure to Collect Traffic Traces for Intrusion Detection Evaluation
Using a VMware Network Infrastructure to Collect Traffic Traces for Intrusion Detection Evaluation by Frederic Massicotte, Mathieu Couture and Annie De Montigny Leboeuf http://www.crc.ca/networksystems_security/
Rust on FreeBSD. Luca Pizzamiglio
Rust on FreeBSD Luca Pizzamiglio pizzamig@freebsd.org 2018-11-08 Rust on FreeBSD whoami(1) Luca Pizzamiglio FreeBSD user since 2009 FreeBSD contributor since 2011 FreeBSD port committer since 2017 The
The Future of ZFS in FreeBSD
The Future of ZFS in FreeBSD Martin Matuška mm@freebsd.org VX Solutions s. r. o. bsdday.eu 05.11.2011 About this presentation This presentation will give a brief introduction into ZFS and answer to the
A Framework for Source Code Metrics
A Framework for Source Code Metrics Neli Maneva, Software Engineering Department, IMI, BAS Nikolay Grozev, Musala Soft Ltd Delyan Lilov, Musala Soft Ltd Overview Introduction Background and Analysis Source
Porting ZFS file system to FreeBSD. Paweł Jakub Dawidek
Porting ZFS file system to FreeBSD Paweł Jakub Dawidek The beginning... ZFS released by SUN under CDDL license available in Solaris / OpenSolaris only ongoing Linux port for FUSE framework
Challenges in Mining Whole Software Universe
Challenges in Mining Whole Software Universe Katsuro Inoue Osaka University Cover Ratio Analyzing Evolution of kern_malloc 1 1 2 3 4 13 15 19 24 36 58 62 65 1 Lites 1.0 Kernel Source 2 Archive - CMU Mach
ECS 150 Operating Systems
ECS 150 Operating Systems March 29th, 2007 Operating Systems Some Examples Operating Systems Some Examples Desktop/Workstation/Server Operating Systems Linux Operating Systems Some Examples Desktop/Workstation/Server
Latest releases: 5.3, The most popular of the *BSDs. Historically aimed for maximum. performance on X86. Now supports most of the popular
Short history Based on: http://www.levenez.com/unix/ 1978 BSD (Barkeley software distribution) Based on unix system developed by Bell. 1991 386BSD BSD port to Intel (Based on 4.3BSD). 1991 Linux based
Advanced Unix System Administration
Advanced Unix System Administration Lecture 5 February 14, 2007 Steven Luo Shared Libraries The dynamic linker Binaries have a symbol table containing functions, etc. and
Refactoring and Rearchitecturing
Refactoring and Rearchitecturing Overview Introduction Refactoring vs reachitecting Exploring the situation Legacy code Code written by others Code already written Not supported code Code without automated
The NetBSD Logical Volume Manager
The NetBSD Logical Volume Manager Adam Hamsik The NetBSD Foundation haad@netbsd.org Abstract LVM is a method of allocating disk space on a disk storage devices. Which is more flexible than conventional
Home Page. Title Page. Contents. Page 1 of 17. Version Control. Go Back. Ken Bloom. Full Screen. Linux User Group of Davis March 1, Close.
Page 1 of 17 Version Control Ken Bloom Linux User Group of Davis March 1, 2005 Page 2 of 17 1. Version Control Systems CVS BitKeeper Arch Subversion SVK 2. CVS 2.1. History started in 1986 as a bunch of
Linux Essentials. Smith, Roderick W. Table of Contents ISBN-13: Introduction xvii. Chapter 1 Selecting an Operating System 1
Linux Essentials Smith, Roderick W. ISBN-13: 9781118106792 Table of Contents Introduction xvii Chapter 1 Selecting an Operating System 1 What Is an OS? 1 What Is a Kernel? 1 What Else Identifies an OS?
Xen and the Art of Virtualization. Nikola Gvozdiev Georgian Mihaila
Xen and the Art of Virtualization Nikola Gvozdiev Georgian Mihaila Outline Xen and the Art of Virtualization Ian Pratt et al. I. The Art of Virtualization II. Xen, goals and design III. Xen evaluation
CptS 360 (System Programming) Unit 2: Introduction to UNIX and Linux
CptS 360 (System Programming) Unit 2: Introduction to UNIX and Linux Bob Lewis School of Engineering and Applied Sciences Washington State University Spring, 2018 Motivation APIs have a history: Learn
2IS55 Software Evolution. Software metrics. Alexander Serebrenik
2IS55 Software Evolution Software metrics Alexander Serebrenik Assignments Assignment 3: Feedback: 3.875/5 BUT only 8 responces Evaluation Q3: Feedback: Thank you! BUT only 6 responces Assignment 4: Deadline:
A Comparison of File. D. Roselli, J. R. Lorch, T. E. Anderson Proc USENIX Annual Technical Conference
A Comparison of File System Workloads D. Roselli, J. R. Lorch, T. E. Anderson Proc. 2000 USENIX Annual Technical Conference File System Performance Integral component of overall system performance Optimised
<Insert Picture Here> Lustre Development
Lustre Development Eric Barton Lead Engineer, Lustre Group Lustre Development Agenda Engineering Improving stability Sustaining innovation Development Scaling
Towards a Wireless Lexicon. Philip Levis Computer Systems Lab Stanford University 20.viii.2007
Towards a Wireless Lexicon Philip Levis Computer Systems Lab Stanford University 20.viii.2007 Low Power Wireless Low cost, numerous devices Wireless sensornets Personal area networks (PANs) Ad-hoc networks
An Empirical Study of Operating Systems Errors. Jing Huang
An Empirical Study of Operating Systems Errors Jing Huang Background previous research manual inspection of logs, testing, and surveys because static analysis is applied uniformly to the entire kernel
OPEN SOURCE SOFTWARE
Introduction to Open Source Software Development Spring semester, 2017 School of Computer Science and Engineering, Pusan National University Joon-Seok Kim OPEN SOURCE SOFTWARE Outline Open source software
Fouad Riaz Bajwa. Co-Founder & FOSS Advocate FOSSFP - ifossf International Free and open Source Software Foundation, MI, USA.
Fouad Riaz Bajwa Co-Founder & FOSS Advocate FOSSFP - ifossf International Free and open Source Software Foundation, MI, USA. www.ifossf.org Worst Security Threats Sharing Knowledge What makes FOSS secure?
(S)LOC Count Evolution for Selected OSS Projects. Tik Report 315
(S)LOC Count Evolution for Selected OSS Projects Tik Report 315 Arno Wagner arno@wagner.name December 11, 009 Abstract We measure the dynamics in project code size for several large open source projects,
It s a Unix(-like) System? An Introduction to TrueOS and Open Source Software. Copyright ixsystems, Inc. 2017
It s a Unix(-like) System? An Introduction to TrueOS and Open Source Software Copyright ixsystems, Inc. 2017 Introduction Ken Moore - Senior software engineer at ixsystems. Core team member for TrueOS
What is version control? (discuss) Who has used version control? Favorite VCS? Uses of version control (read)
1 For the remainder of the class today, I want to introduce you to a topic we will spend one or two more classes discussing and that is source code control or version control. What is version control?
A Transformation-Based Model of Evolutionary Architecting for Embedded System Product Lines
A Transformation-Based Model of Evolutionary Architecting for Embedded System Product Lines Jakob Axelsson School of Innovation, Design and Engineering, Mälardalen University, SE-721 23 Västerås, Sweden
Kismet. Dragorn July 10,
Kismet Dragorn dragorn@kismetwireless.net July 10, 2004 1 Kismet 802.11 sniffer Can sniff 11a, 11b, and 11g with the right hardware Completely passive Signature and Trend Layer2 IDS Runs on Linux, some
What is FreeBSD? Christian Brüffer The FreeBSD Project
What is FreeBSD? Christian Brüffer The FreeBSD Project Overview What is FreeBSD? License Release Engineering Main Features BSD/FreeBSD History Organizational Structure What is FreeBSD?
ComLinC User Manual. Kefei Lu
ComLinC User Manual Kefei Lu December 3, 2007 Contents 1 Introduction to ComLinC 1 1.1 Licensing............................... 1 1.2 Getting Started............................ 1 1.2.1 Prerequists..........................
Professional Linux Kernel Architecture By Wolfgang Mauerer
Professional Linux Kernel Architecture By Wolfgang Mauerer If searched for the book Professional Linux Kernel Architecture by Wolfgang Mauerer in pdf form, in that case you come on to the loyal site. We
Independent implementations of an interface
Software property topics interfaces data formats standards and standardization protection mechanisms trade secrets licenses patents copyrights open source / free software real software systems Independent
SOFTWARE CONFIGURATION MANAGEMENT
SOFTWARE CONFIGURATION MANAGEMENT Cape Town SPIN - Albert Visagie - 19 March 2008 Goals Where were we? And get back there reliably. Where are we? How did we get here? Which bugs were fixed in this version?
CMPSC 311- Introduction to Systems Programming Module: UNIX/Operating Systems
CMPSC 311- Introduction to Systems Programming Module: UNIX/Operating Systems Professor Patrick McDaniel Fall 2015 Assignment #1 See webpage Due 9/14/15 Page 2 UNIX Utilities: tar tar collects multiple
Practical Programming with R
Practical Programming with R Stuart Borrett biol534 Why to write code Bruno Olveira http://nicercode.github.io/blog/2013-04-05-why-nice-code/ Review Lab 1 What were the most challenging Exercises? Why?
ZFS. Right Now! Jeff Bonwick Sun Fellow
ZFS Right Now! Jeff Bonwick Sun Fellow Create a Mirrored ZFS Pool, tank # zpool create tank mirror c2d0 c3d0 That's it. You're done. # df Filesystem size used avail capacity Mounted on tank 233G 18K 233G
Chapter 7: Linear regression
Chapter 7: Linear regression Objective (1) Learn how to model association bet. 2 variables using a straight line (called "linear regression"). (2) Learn to assess the quality of regression models. (3)
Agile Mind Mathematics 6 Scope and Sequence, Indiana Academic Standards for Mathematics
In the three years prior Grade 6, students acquired a strong foundation in numbers and operations, geometry, measurement, and data. Students are fluent in multiplication of multi-digit whole numbers and
Empirical Study on Impact of Developer Collaboration on Source Code
Empirical Study on Impact of Developer Collaboration on Source Code Akshay Chopra University of Waterloo Waterloo, Ontario a22chopr@uwaterloo.ca Parul Verma University of Waterloo Waterloo, Ontario p7verma@uwaterloo.ca
USPAS Simulation of Beam and Plasma Systems Steven M. Lund, Jean-Luc Vay, Remi Lehe, Daniel Winklehner and David L. Bruhwiler Lecture: Software Version Control Instructor: David L. Bruhwiler Contributors:
Grade 1 Report Card. Rubrics Mathematics
Operations and Algebraic Thinking Grade Report Card Rubrics Mathematics Standard: Demonstrates multiple strategies to fluently add and subtract within 0 (including but not limited to: counting on and making
Intro Technical details Using vcsh Outlook Outro. vcsh. manage config files in $HOME via fake bare git repositories
Intro Technical details Using Outlook Outro manage config files in $HOME via fake bare git repositories Richard Hartmann, RichiH@{freenode,OFTC,IRCnet}, richih.mailinglist@gmail.com 2012-02-04 Intro Technical
The Design and Implementation of OpenBGPd
The Design and Implementation of OpenBGPd André Oppermann Claudio Jeker SWINOG-9 Berne, 29. September 2004 The Design
Russell Doty Red Hat
Russell Doty Red Hat disclaimer This presentation does not constitute advice or legal advice. It represents my personal observations and insights. I m not speaking for Red Hat. If you have questions, seek
Graduate Topics in Biophysical Chemistry CH Assignment 0 (Programming Assignment) Due Monday, March 19
Introduction and Goals Graduate Topics in Biophysical Chemistry CH 8990 03 Assignment 0 (Programming Assignment) Due Monday, March 19 It is virtually impossible to be a successful scientist today without
Software Lesson 1 Outline
Software Lesson 1 Outline 1. Software Lesson 1 Outline 2. What is Software? A Program? Data? 3. What are Instructions? 4. What is a Programming Language? 5. What is Source Code? What is a Source File?
COMP2330 Data Communications and Networking
COMP2330 Data Communications and Networking Dr. Chu Xiaowen (Second semester, 2009-2010 academic year) Laboratory 3 Last update: Feb-3-2009 Use Wireshark to Analyze IP Packet Objectives: (1) Use Wireshark
GUIDE TO MAKE A REAL CONTRIBUTION TO AN OPEN SOURCE PROJECT 1. 1
GUIDE TO MAKE A REAL CONTRIBUTION TO AN OPEN SOURCE PROJECT 1. 1 WHO AM I? @tushar_rishav GSoC'16 student contributing to coala - a static code analysis tool, under Python So ware Foundation. A senior
Software Distribution and Package Management
Software Distribution and Package Management Pieter Lexis February 15, 2016 Package Management - Pieter Lexis February 15, 2016 1 / 1 whoami Pieter Lexis OS3 graduate SysAdmin for a long time DNS + DNSSEC
Version Control. CSC207 Fall 2014
Version Control CSC207 Fall 2014 Problem 1: Working Solo How do you keep track of changes to your program? Option 1: Don t bother Hope you get it right the first time Hope you can remember what changes
System Administration. Storage Systems
System Administration Storage Systems Agenda Storage Devices Partitioning LVM File Systems STORAGE DEVICES Single Disk RAID? RAID Redundant Array of Independent Disks Software vs. Hardware RAID 0, 1,
UBC: An Efficient Unified I/O and Memory Caching Subsystem for NetBSD
UBC: An Efficient Unified I/O and Memory Caching Subsystem for NetBSD Chuck Silvers The NetBSD Project chuq@chuq.com, http://www.netbsd.org/ Abstract This paper introduces UBC ( Unified Buffer Cache ),
Software Metrics and Design Principles. What is Design?
Software Metrics and Design Principles Chapters 5,8 What is Design? Design is the process of creating a plan or blueprint to follow during actual construction Design is a problem-solving activity that
CSE 4/521 Introduction to Operating Systems
CSE 4/521 Introduction to Operating Systems Lecture 3 Operating Systems Structures (Operating-System Services, User and Operating-System Interface, System Calls, Types of System Calls, System Programs,
EXPLODE: a Lightweight, General System for Finding Serious Storage System Errors. Junfeng Yang, Can Sar, Dawson Engler Stanford University
EXPLODE: a Lightweight, General System for Finding Serious Storage System Errors Junfeng Yang, Can Sar, Dawson Engler Stanford University Why check storage systems? Storage system errors are among the
Making Applications Mobile
Making Applications Mobile using containers Ottawa Linux Symposium, July 2006 Cedric Le Goater Daniel Lezcano Clement Calmels Dave Hansen
File System Case Studies. Jin-Soo Kim Computer Systems Laboratory Sungkyunkwan University
File System Case Studies Jin-Soo Kim (jinsookim@skku.edu) Computer Systems Laboratory Sungkyunkwan University http://csl.skku.edu Today s Topics The Original UNIX File System FFS Ext2 FAT 2 UNIX FS (1)
Using Git For Development. Shantanu Pavgi, UAB IT Research Computing
Using Git For Development Shantanu Pavgi, pavgi@uab.edu UAB IT Research Computing Outline Version control system Git Branching and Merging Workflows Advantages Version Control System (VCS) Recording changes
Engage Education Foundation
E Free Exam for 2013-17 VCE study design Engage Education Foundation Units 3 and 4 Visual Communication and Design Practice Exam Solutions Stop! Don t look at these solutions until you have attempted the
The Myth and Reality of using Haskell in the Real World
The Myth and Reality of using Haskell in the Real World Experiences from darcs Cornell University September 24, 2005 Outline Introduction to darcs What s an SCM? Ideas behind darcs Myth: Haskell code is
Version Control with Git
Version Control with Git Methods & Tools for Software Engineering (MTSE) Fall 2017 Prof. Arie Gurfinkel based on https://git-scm.com/book What is Version (Revision) Control A system for managing changes
Version Control. 1 Version Control Systems. Ken Bloom. Linux User Group of Davis March 1, 2005
Version Control Ken Bloom Linux User Group of Davis March 1, 2005 You ve probably heard of version control systems like CVS being used to develop software. Real briefly, a version control system is generally
UNIX/Linux Fundamentals Lecture 1. Nick Stiffler Philip Conrad
UNIX/Linux Fundamentals Lecture 1 Nick Stiffler Philip Conrad Matrix Reloaded What will we cover? Operating system overview UNIX commands, shell & process mgt. Scripting languages Programming tools Various
OS Extensibility: Spin, Exo-kernel and L4
OS Extensibility: Spin, Exo-kernel and L4 Extensibility Problem: How? Add code to OS how to preserve isolation? without killing performance? What abstractions? General principle: mechanisms in OS, policies
The future of X.Org on non-gnu/linux systems
The future of X.Org on non-gnu/linux systems Matthieu Herrb OpenBSD/X.Org February 2, 2013 Introduction X has always been multi-platform XFree86 was started on SVr4 and FreeBSD, ported on Linux later.
Chapter 3. Revision Control
Chapter 3 Revision Control We begin our journey into software engineering before we write a single line of code. Revision control systems (RCSes) such as Subversion or CVS are astoundingly useful for single-developer
Why lock down the kernel? Matthew Garrett
Why lock down the kernel? Matthew Garrett What are we trying to do? There s a barrier between users and root Should there be a barrier between root and the kernel? Some prior art CONFIG_MODULE_SIG_FORCE
Practical C Programming
Practical C Programming Advanced Preprocessor # - quotes a string ## - concatenates things #pragma h3p://gcc.gnu.org/onlinedocs/cpp/pragmas.html #warn #error Defined Constants Macro FILE LINE DATE TIME
Creating Accessible Word Documents
Creating Accessible Word Documents 1. Formatting the Titles and Headings Structure is added to documents by using styles. Using styles helps your readers to visually get a sense of the structure of your
Software Compare and Contrast
Microsoft Software Compare and Contrast Word Easy to navigate. Compatible with all PC computers. Very versatile. There are lots of templates that can be used to create flyers, calendars, resumes, etc.
FreeBSD/ZFS last word in operating/file systems. BSDConTR Paweł Jakub Dawidek
FreeBSD/ZFS last word in operating/file systems BSDConTR 2007 Paweł Jakub Dawidek The beginning... ZFS released by SUN under CDDL license available in Solaris / OpenSolaris only ongoing
Software Testing Fundamentals. Software Testing Techniques. Information Flow in Testing. Testing Objectives
Software Testing Fundamentals Software Testing Techniques Peter Lo Software Testing is a critical element of software quality assurance and represents the ultimate review of specification, design and coding.
Effective Use of CSAIL Storage
Effective Use of CSAIL Storage How to get the most out of your computing infrastructure Garrett Wollman, Jonathan Proulx, and Jay Sekora The Infrastructure Group Introduction Outline of this talk 1. Introductions
A brief overview of DRM/KMS and its status in NetBSD
A brief overview of DRM/KMS and its status in NetBSD Taylor Riastradh Campbell campbell@mumble.net riastradh@netbsd.org AsiaBSDcon 2015 Tokyo, Japan March 13, 2015 No, not that DRM! DRM: Direct rendering
EmpAnADa Project. Christian Lange. June 4 th, Eindhoven University of Technology, The Netherlands.
EmpAnADa Project C.F.J.Lange@tue.nl June 4 th, 2004 Eindhoven University of Technology, The Netherlands Outline EmpAnADa introduction Part I Completeness and consistency in detail Part II Background UML
System Administration
System Administration MTAT.08.021 6 ECTS Markko Merzin markko.merzin@ut.ee http://courses.cs.ut.ee/2012/syshald/ 1/55 Markko Merzin Lecturer worked as a System administrator: 15 years (and counting) Researcher:
What are Requirements?
Domain Specific Languages and Requirements (Engineering) Markus Voelter www.voelter.de voelter@acm.org What are Requirements? 1 a requirement is a singular documented need of what a particular product
Web Ontology for Software Package Management
Proceedings of the 8 th International Conference on Applied Informatics Eger, Hungary, January 27 30, 2010. Vol. 2. pp. 331 338. Web Ontology for Software Package Management Péter Jeszenszky Debreceni
Data Visualization via Conditional Formatting
Data Visualization Data visualization - the process of displaying data (often in large quantities) in a meaningful fashion to provide insights that will support better decisions. Data visualization improves
Porting ZFS 1) file system to FreeBSD 2)
Porting ZFS 1) file system to FreeBSD 2) Paweł Jakub Dawidek 1) last word in file systems 2) last word in operating systems Do you plan to use ZFS in FreeBSD 7? Have you already tried
goto considered not particularly harmful: defect analysis in a major numerical library"
Title Slide Kingston University CISM Faculty Research Seminar................................................................................... goto considered not particularly harmful: defect analysis
Versioning Systems. Tolu Oguntusin(too06u) 12th November, University of Nottingham
Introduction to in Software Quality. (too06u) University of Nottingham 12th November, 2008 Outline Introduction to in Software Quality. 1 Introduction to What are? How do they work? How are files stored?
Filesystem Performance on FreeBSD
Filesystem Performance on FreeBSD Kris Kennaway kris@freebsd.org BSDCan 2006, Ottawa, May 12 Introduction Filesystem performance has many aspects No single metric for quantifying it I will focus on aspects
Continuity and Tangent Lines for functions of two variables
Continuity and Tangent Lines for functions of two variables James K. Peterson Department of Biological Sciences and Department of Mathematical Sciences Clemson University April 4, 2014 Outline 1 Continuity
Beyond Competent (In addition to C)
Grade 6 Math Length of Class: School Year Program/Text Used: Everyday Math Competency 1: Ratios and Proportional Relationships - Students will demonstrate the ability to understand ratios and proportional