[168] | 1 | \documentclass [compress, t]{beamer} |
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| 2 | \usepackage{styles/beamerthemeMarseille} |
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| 3 | \usepackage[latin1]{inputenc} |
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| 4 | \usepackage{epsfig} |
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| 5 | \usepackage{graphicx} |
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| 6 | \usepackage{graphics} |
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| 7 | \usepackage{subfigure} |
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| 8 | \usepackage{color} |
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| 9 | \usepackage{algorithmic} |
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| 10 | \usepackage{algorithm} |
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| 11 | \usepackage{pgfarrows, pgfnodes} |
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| 12 | \usepackage{url} |
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| 13 | \usepackage{textcomp} |
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| 14 | \usepackage{url}\urlstyle{sf} |
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| 15 | \usepackage{xspace} |
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| 16 | \usepackage{listings} |
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| 17 | |
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| 18 | % Beamer Options |
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| 19 | \setbeamercovered{dynamic} |
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| 20 | \setbeamertemplate{blocks}[rounded][shadow=true] |
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| 21 | %\setbeamertemplate{background canvas}[vertical shading][bottom=white,top=structure.fg!20] |
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| 22 | |
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| 23 | %%%% macros %%%% |
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| 24 | |
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| 25 | % Macros |
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| 26 | \newcommand{\cmt} {{\em CMT}\@\xspace}% |
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| 27 | \newcommand{\svn} {{\em SVN}\@\xspace}% |
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| 28 | \newcommand{\cvs} {{\em CVS}\@\xspace}% |
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| 29 | |
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| 30 | \setbeamercovered{dynamic} |
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| 31 | |
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| 32 | \definecolor{rltgreen}{rgb}{0,0.5,0} |
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| 33 | \pgfdeclareimage[height=0.5cm]{LogoLAL}{logos/logo} |
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| 34 | \logo{ \pgfuseimage{LogoLAL} } |
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| 35 | |
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| 36 | \title{SVN evaluation and proposal for Atlas, \\ Atlas software week} |
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| 37 | \author{Christian Arnault, Vincent Garonne\\ |
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| 38 | \{arnault,garonne\}@lal.in2p3.fr} |
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[174] | 39 | \institute{Laboratoire de l'Accélérateur Linéaire} |
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[168] | 40 | \date {April 7, 2006} % \today |
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| 41 | |
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| 42 | \begin{document} |
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| 43 | |
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| 44 | % Transparent: Première page |
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| 45 | \begin{frame} |
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| 46 | \maketitle |
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| 47 | %\textcolor{gray}{\it \scriptsize } |
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| 48 | \end{frame} |
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| 49 | |
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| 50 | %------------------------------- SECTION -------------------------% |
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| 51 | \section*{Outline} |
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[170] | 52 | |
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| 53 | %------------------------------- SLIDE -------------------------% |
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[168] | 54 | \frame |
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| 55 | { |
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| 56 | % \frametitle{Outline} |
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| 57 | \vfill |
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| 58 | \begin{block}{Outline} |
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| 59 | \tableofcontents[hideallsubsections] |
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| 60 | \end{block} |
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| 61 | } |
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| 62 | |
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| 63 | %------------------------------- SECTION -------------------------% |
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| 64 | \section[svn introduction]{\svn in a nutshell} |
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| 65 | |
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[170] | 66 | %------------------------------- SLIDE -------------------------% |
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[168] | 67 | \frame |
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| 68 | { |
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| 69 | \frametitle{\svn in a nutshell} |
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| 70 | \begin{block}{What is Subversion (or SVN) ?} |
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| 71 | \begin{itemize} |
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| 72 | \item Source code management system |
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| 73 | \item Open Source project (\url{http://subversion.tigris.org/}) |
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| 74 | \item \svn has new features that cover many limitations of \cvs |
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| 75 | \item Subversion commands are very similar to \cvs, most of |
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| 76 | the time it's a matter of replacing \texttt{"cvs"} with \texttt{"svn"}~\cite{cvscrossover} |
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| 77 | \end{itemize} |
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| 78 | \end{block} |
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| 79 | |
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| 80 | \begin{block}{Questions for Atlas} |
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| 81 | As we have observed limitations/weird behaviors of \cvs: |
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| 82 | \begin{itemize} |
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| 83 | \item Is it appropriate to do a swap ? |
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[174] | 84 | \item Are the Atlas developers enough |
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[168] | 85 | perturbed :) by the multi-projects structure without adding that ? |
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| 86 | \end{itemize} |
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| 87 | \end{block} |
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| 88 | } |
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| 89 | |
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| 90 | %------------------------------- SECTION -------------------------% |
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[174] | 91 | \section[CVS/SVN comparison]{\svn versus \cvs} |
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[170] | 92 | |
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| 93 | %------------------------------- SLIDE -------------------------% |
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[168] | 94 | \frame |
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| 95 | { |
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| 96 | \frametitle{\cvs versus \svn} |
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| 97 | \begin{itemize} |
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| 98 | \item \svn really works faster than \cvs : |
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| 99 | \begin{itemize} |
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| 100 | \setbeamertemplate{itemize items}[circle] |
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| 101 | \item Transmits less information through the network |
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| 102 | \item Supports more operations for offline mode, e.g |
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| 103 | client sends deltas to server when committing |
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| 104 | \end{itemize} |
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| 105 | % \item More details : |
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| 106 | \end{itemize} |
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| 107 | \scriptsize |
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| 108 | \begin{table}[htb] |
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| 109 | \begin{center} |
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| 110 | \begin{tabular}{|l|c|c|} |
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| 111 | \hline |
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| 112 | \texttt { \large \bf \textcolor{blue}{Source code management system}} & {\bf \large \textcolor{blue}{\cvs} } & {\bf \large \textcolor{blue}{\svn}} \\ |
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| 113 | \hline |
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| 114 | \hline |
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| 115 | \texttt {\bf Atomic Commits } & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 116 | \texttt {\bf Efficient (constant-time) tagging } & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 117 | \texttt {\bf File renames handles cleanly (renaming, moving)} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 118 | \texttt {\bf Advanced Merging Features} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 119 | \texttt {\bf Manipulation of all the file types} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 120 | \texttt {\bf Easy Development on Branches} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 121 | \texttt {\bf Easy Server Administration} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 122 | \texttt {\bf Remote Repository Replication} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 123 | \texttt {\bf Scalable Performance and Admin} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 124 | \texttt {\bf Advanced repository permissions Features} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 125 | \texttt {\bf Web Browser Interfaces} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 126 | \texttt {\bf HTTP proxy to connect the server} & \textcolor{red}{No} & \textcolor{green}{\em Yes} \\ \hline |
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| 127 | \end{tabular} |
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| 128 | \end{center} |
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| 129 | \end{table} |
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| 130 | ** For more infos, look~\cite{svnvscvs} |
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| 131 | } |
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| 132 | |
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| 133 | %------------------------------- SECTION -------------------------% |
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| 134 | \section[Proposal]{Proposal for Atlas} |
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[170] | 135 | |
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| 136 | %------------------------------- SLIDE -------------------------% |
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[168] | 137 | \frame |
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| 138 | { |
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| 139 | \frametitle{Scenario for Atlas} |
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| 140 | |
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| 141 | \begin{block}{ Roadmap} |
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| 142 | \begin{enumerate} |
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[176] | 143 | \item Convert the Atlas CVS repository into a Subversion one |
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[168] | 144 | \item Provide tools to provide synchronization operations between \cvs and \svn repositories |
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| 145 | \begin{itemize} |
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| 146 | \setbeamertemplate{itemize items}[circle] |
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| 147 | \item For a certain period, we will have both system running at the same time |
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| 148 | \item remark: iterative transition is less painful for the developers :) |
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| 149 | \end{itemize} |
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| 150 | \item Incorporate \svn in the complex Atlas software management chain, it supposes impact to : |
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| 151 | \begin{itemize} |
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| 152 | \setbeamertemplate{itemize items}[circle] |
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| 153 | \item CMT |
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| 154 | \item Tag Collector |
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| 155 | \item Nicos |
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| 156 | \end{itemize} |
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[174] | 157 | \item If successful, we could do the permanent switch; if not ... :( |
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[168] | 158 | \end{enumerate} |
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| 159 | \end{block} |
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| 160 | } |
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| 161 | |
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[170] | 162 | %------------------------------- SLIDE -------------------------% |
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[168] | 163 | \frame |
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| 164 | { |
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| 165 | \frametitle{CVS repository conversion} |
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| 166 | \begin{block}{Conversion script} |
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[176] | 167 | For better understanding, we have developed our own |
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[168] | 168 | \texttt{cvs2svn} python script {\small (\texttt{\url{/afs/cern.ch/atlas/scripts/cvs2svn.py}})}: |
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| 169 | \begin{itemize} |
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| 170 | \setbeamertemplate{itemize items}[circle] |
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| 171 | \item Keeps the history of all tags up to HEAD |
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| 172 | \item Skips the intermediate commits between 2 tags |
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| 173 | \item Can be applied iteratively |
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| 174 | \end{itemize} |
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| 175 | \end{block} |
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| 176 | \begin{block}{Definition of a repository organization} |
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| 177 | \begin{itemize} |
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[172] | 178 | \item SVN gives full freedom in terms of internal structure |
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[168] | 179 | \item Tags, branches are views to the source history |
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| 180 | \begin{itemize} |
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| 181 | \setbeamertemplate{itemize items}[circle] |
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[174] | 182 | \item in CVS, they are meta-data applied to individual files |
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[168] | 183 | and appear like directory structures |
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| 184 | \end{itemize} |
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| 185 | \item Views can be freely modified and have revision number |
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| 186 | \end{itemize} |
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| 187 | \end{block} |
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| 188 | } |
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| 189 | |
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[170] | 190 | %------------------------------- SLIDE -------------------------% |
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[168] | 191 | \frame |
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| 192 | { |
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| 193 | \frametitle{Converting CVS Repository to Subversion} |
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| 194 | \begin{block}{} |
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| 195 | \begin{itemize} |
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| 196 | \item We have selected the following organization for each project/package/tag:\\ |
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| 197 | \texttt{\textcolor{blue}{ |
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| 198 | <project>/.../<package>/trunk/...\\ |
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[176] | 199 | <project>/.../<package>/tags/<tag>/...}} |
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[168] | 200 | \end{itemize} |
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| 201 | \end{block} |
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| 202 | |
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| 203 | \begin{block}{} |
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| 204 | \begin{itemize} |
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| 205 | \item The complete Atlas cvs repository has been converted to a svn one. The svn url is :\\ |
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| 206 | {\small \texttt{\url{file:///afs/cern.ch/atlas/software/svnrepository/repository}}} |
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| 207 | \item It takes a looong time to do that the first time |
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| 208 | \begin{itemize} |
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| 209 | \setbeamertemplate{itemize items}[circle] |
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| 210 | \item Try different \svn backends: Berkley DB, \underline{\svn file system} |
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[176] | 211 | \item It takes one week to complete the procedure, e.g. 8 hours for the AtlasCore project |
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| 212 | \item But update will only concern recent tags |
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[168] | 213 | \end{itemize} |
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| 214 | \end{itemize} |
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| 215 | \end{block} |
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| 216 | } |
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| 217 | |
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[170] | 218 | %------------------------------- SLIDE -------------------------% |
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| 219 | \frame |
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| 220 | { |
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| 221 | \frametitle{Conversion validation and management tools} |
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[168] | 222 | |
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[170] | 223 | \begin{block}{Conversion validation tools} |
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| 224 | \begin{itemize} |
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| 225 | \item We have implemented several tests to check the quality of the |
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| 226 | conversion: |
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| 227 | \begin{itemize} |
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| 228 | \setbeamertemplate{itemize items}[circle] |
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| 229 | \item Comparing the sources at each tag with diff tests |
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[172] | 230 | \item Comparing the list of tags for a package |
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[170] | 231 | \item Check global structure of the \svn repository |
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| 232 | \item \url{/afs/cern.ch/atlas/scripts/testcvs2svn.py} |
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| 233 | \end{itemize} |
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| 234 | \end{itemize} |
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| 235 | \end{block} |
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| 236 | |
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| 237 | \begin{block}{Management tools} |
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| 238 | \begin{itemize} |
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| 239 | \item We have also implemented a script which re-organizes the SVN repository:\\ |
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[176] | 240 | \texttt{\textcolor{blue}{<project>/.../<package>/trunk/...\\ |
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[170] | 241 | <project>/.../<package>/<tag>/...}} |
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| 242 | \end{itemize} |
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| 243 | \end{block} |
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| 244 | } |
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| 245 | |
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| 246 | |
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[168] | 247 | % \item A "CVS complient" script is available at cern |
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| 248 | % \texttt{/afs/cern.ch/atlas/scripts/asvn} |
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| 249 | % \item \url{http://uimon.cern.ch/twiki/bin/view/Atlas/StudiesForUsingSVNInAtlas} |
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| 250 | |
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[170] | 251 | %------------------------------- SLIDE -------------------------% |
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[168] | 252 | \frame |
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| 253 | { |
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| 254 | \frametitle{Performance and scalability} |
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| 255 | \begin{block}{Test stress scenario} |
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| 256 | We define the following {\bf action} for an user: |
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| 257 | \begin{itemize} |
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[172] | 258 | \item User selects randomly a package |
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| 259 | \item He extracts and modifies it, then registers it until the operation is successful |
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[168] | 260 | \item Then he sleeps $n$ seconds with $n$ sort randomly $ \in [1, T_{max}]$ |
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| 261 | \end{itemize} |
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| 262 | \end{block} |
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| 263 | |
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| 264 | \begin{block}{Experiment parameters} |
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| 265 | \begin{itemize} |
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| 266 | \item We have done experiments with different: |
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| 267 | \begin{itemize} |
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| 268 | \setbeamertemplate{itemize items}[circle] |
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| 269 | \item Total number of users (10, \textcolor{blue}{100}, 1000) |
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| 270 | \item Total number of packages (10, \textcolor{blue}{1000}, 10.000) |
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| 271 | \end{itemize} |
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| 272 | \item Concurrent user actions were launched by a multi-threaded program |
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[170] | 273 | ({\small\texttt{\url{/afs/cern.ch/user/v/vgaronne/svnTestStress}}}) |
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[168] | 274 | \end{itemize} |
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| 275 | \end{block} |
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| 276 | } |
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| 277 | |
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[170] | 278 | %------------------------------- SLIDE -------------------------% |
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[168] | 279 | \frame{ |
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| 280 | \frametitle{Performance and scalability - Results} |
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| 281 | \begin{block}{} |
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| 282 | \begin{itemize} |
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| 283 | \item Let ${\cal R}atio$ be the ratio $\frac {Total~number~of~users} {{Total~number~of~packages}}$ |
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| 284 | \end{itemize} |
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| 285 | \end{block} |
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| 286 | |
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| 287 | \begin{block}{} |
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| 288 | We obtained : |
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| 289 | \small |
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| 290 | \begin{center} |
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| 291 | \begin{tabular}{ccc} |
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[176] | 292 | \hline ${\cal R}atio$ & $T_{max}(s)$ & Average action time (s) \\ \hline |
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[168] | 293 | 0.01 & 3600.0& 1.34 \\ |
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| 294 | 0.01 & 100.0& 1.06 \\ |
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| 295 | 0.01 & 10.0 & 1.38 \\ |
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| 296 | \textcolor{blue}{0.1} & \textcolor{blue}{ 3600.0} & \textcolor{blue}{5.77} \\ |
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[176] | 297 | \textcolor{blue}{0.1}& \textcolor{blue}{100.0}& \textcolor{blue}{4.26} \\ |
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[168] | 298 | \textcolor{blue}{0.1} & \textcolor{blue}{10.0} & \textcolor{blue}{6.96} \\ |
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| 299 | 1.0 & 3600.0 & 7.42 \\ |
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| 300 | 1.0 & 100.0& 7.06 \\ |
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| 301 | 1.0 & 10.0& 8.88\\ |
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| 302 | \end{tabular} |
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| 303 | \end{center} |
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| 304 | {\footnotesize\textcolor{blue}{**In blue, the values relevant for Atlas}} |
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| 305 | \end{block} |
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| 306 | } |
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| 307 | |
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[170] | 308 | %------------------------------- SLIDE -------------------------% |
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[168] | 309 | \frame{ |
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| 310 | \frametitle{Synchronization operations} |
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| 311 | \begin{block} {Mainly at the user level:} |
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| 312 | \begin{itemize} |
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| 313 | \item We proposed a script \texttt{"asvn"} that mimics the CVS syntax for SVN, including the synchronization operations on tags: |
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| 314 | \begin{itemize} |
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| 315 | \setbeamertemplate{itemize items}[circle] |
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[170] | 316 | \item Non exhaustive commands are: checkin, checkout , tag, ... |
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[168] | 317 | \item Provides also cmt specific commands working with SVN, e.g. |
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| 318 | recursive checkout, svntags, svnsubprojects, ... |
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| 319 | \item see \url{/afs/cern.ch/atlas/scripts/asvn} |
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| 320 | \end{itemize} |
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| 321 | \item \textcolor{red} {We assume that when users switch completely to svn for a package, |
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| 322 | they will not work anymore with \cvs for this package, otherwise we will have integrity problems} |
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[172] | 323 | \item The synchronization operation should be triggered at the user/developer level during tag operations\\ |
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[168] | 324 | \texttt{> asvn --sync tag Package-00-00-01 Package} |
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| 325 | \end{itemize} |
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| 326 | \end{block} |
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| 327 | } |
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| 328 | |
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[170] | 329 | %------------------------------- SLIDE -------------------------% |
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[168] | 330 | \frame{ |
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[170] | 331 | \frametitle{Impact to the Atlas software management chain and tools} |
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[168] | 332 | |
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| 333 | \begin{block} {Impact to the work model} |
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| 334 | \begin{itemize} |
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| 335 | \item No real change is expected |
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| 336 | \end{itemize} |
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| 337 | \end{block} |
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| 338 | |
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| 339 | \begin{block} {Impact to the tools} |
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| 340 | \begin{itemize} |
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[172] | 341 | \item CMT: The \texttt{"asvn"} script previously presented covers these aspects |
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| 342 | \item Tag Collector: Needs an interface to SVN, but should be much simpler than the interface to CVS. If not possible immediately, |
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[168] | 343 | we could go on temporally with the synchronized Atlas CVS repository |
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[170] | 344 | \item NICOS: Normaly only concerned with checkout operations ? |
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[168] | 345 | \end{itemize} |
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| 346 | \end{block} |
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| 347 | } |
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| 348 | |
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[171] | 349 | |
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| 350 | %------------------------------- SLIDE -------------------------% |
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[172] | 351 | \frame{ |
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[176] | 352 | \frametitle{A brief summary by pictures...} |
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[172] | 353 | %\begin{center} |
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| 354 | %\vfill |
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[176] | 355 | \includegraphics<1>[width=0.92\paperwidth,height=0.74\paperheight]{figures/SoftwareFlow00} |
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| 356 | \includegraphics<2>[width=0.92\paperwidth,height=0.74\paperheight]{figures/SoftwareFlow01} |
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| 357 | \includegraphics<3>[width=0.92\paperwidth,height=0.74\paperheight]{figures/SoftwareFlow02} |
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| 358 | \includegraphics<4>[width=0.92\paperwidth,height=0.74\paperheight]{figures/SoftwareFlow03} |
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| 359 | \includegraphics<5>[width=0.92\paperwidth,height=0.74\paperheight]{figures/SoftwareFlow04} |
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| 360 | \includegraphics<6>[width=0.92\paperwidth,height=0.74\paperheight]{figures/SoftwareFlow05} |
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[172] | 361 | %+\end{center} |
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[171] | 362 | } |
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| 363 | |
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[168] | 364 | %------------------------------- SECTION -------------------------% |
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| 365 | \section{Conclusion} |
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[170] | 366 | |
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| 367 | %------------------------------- SLIDE -------------------------% |
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[168] | 368 | \frame{ |
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| 369 | \frametitle{Conclusion} |
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| 370 | |
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[170] | 371 | \begin{block} {} |
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| 372 | \begin{itemize} |
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[176] | 373 | \item All the necessary tools are in place to start using SVN in Atlas |
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[170] | 374 | \item Testing by real users, will help to tune and improve these tools |
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[172] | 375 | \item Doing more tests to validate the atlas svn repository |
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[176] | 376 | \item We should clarify the migration policy |
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| 377 | %\begin{itemize} |
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| 378 | % \item Management of the "CVSROOT/commitavail" file for each package |
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| 379 | % to guaranty synchronization between CVS and SVN repository |
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| 380 | %\end{itemize} |
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| 381 | \item Implementing the interface to SVN in Tag Collector%, depends on TC team availability |
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[170] | 382 | \end{itemize} |
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| 383 | \end{block} |
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[172] | 384 | \begin{block} {Future} |
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[170] | 385 | \begin{itemize} |
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[172] | 386 | \item SVN brings lots of new interesting features, that we could use incrementally : |
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[170] | 387 | \begin{itemize} |
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| 388 | \setbeamertemplate{itemize items}[circle] |
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| 389 | \item Metadata features |
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| 390 | \item Real Multi-repository |
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| 391 | \item Directory management |
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| 392 | \item Transparent branch management |
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| 393 | \end{itemize} |
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| 394 | \end{itemize} |
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| 395 | \end{block} |
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| 396 | } |
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[168] | 397 | %------------------------------- SECTION -------------------------% |
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[170] | 398 | \section*{References} |
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| 399 | |
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| 400 | %------------------------------- SLIDE -------------------------% |
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[168] | 401 | \frame[allowframebreaks] |
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| 402 | { |
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| 403 | \frametitle{References} |
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| 404 | \nocite{subversion} |
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| 405 | \nocite{cvs2svn} |
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| 406 | \bibliographystyle{unsrt} |
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| 407 | \bibliography{CMT06-04-2006-sit} |
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| 408 | } |
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| 409 | |
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| 410 | \end{document} |
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| 411 | %------------------------------- End Of File -------------------------% |
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