diff --git a/talks-public/2020-03-24-ensea/2020-03-24-ensea.org b/talks-public/2020-03-24-ensea/2020-03-24-ensea.org index 87306d8..28f4543 100644 --- a/talks-public/2020-03-24-ensea/2020-03-24-ensea.org +++ b/talks-public/2020-03-24-ensea/2020-03-24-ensea.org @@ -1,169 +1,169 @@ #+COLUMNS: %40ITEM %10BEAMER_env(Env) %9BEAMER_envargs(Env Args) %10BEAMER_act(Act) %4BEAMER_col(Col) %10BEAMER_extra(Extra) %8BEAMER_opt(Opt) #+TITLE: Software Heritage #+SUBTITLE: Analyzing the Global Graph of Public Software Development #+BEAMER_HEADER: \date[24 Mar 2020, ENSEA]{24 Mars 2020\\ENSEA --- Cergy, France\\ (via conf call)\\[-2ex]} #+AUTHOR: Stefano Zacchiroli #+DATE: 24 March 2020 #+EMAIL: zack@upsilon.cc #+INCLUDE: "../../common/modules/prelude-toc.org" :minlevel 1 #+INCLUDE: "../../common/modules/169.org" #+BEAMER_HEADER: \institute[UParis \& Inria]{Université de Paris \& Inria --- {\tt zack@upsilon.cc, @zacchiro}} #+BEAMER_HEADER: \author{Stefano Zacchiroli} # Required by graph-compression.org module #+LATEX_HEADER_EXTRA: \usepackage{pdfpages} # Syntax highlighting setup #+LATEX_HEADER_EXTRA: \usepackage{minted} #+LaTeX_HEADER_EXTRA: \usemintedstyle{tango} #+LaTeX_HEADER_EXTRA: \newminted{sql}{fontsize=\scriptsize} #+name: setup-minted #+begin_src emacs-lisp :exports results :results silent (setq org-latex-listings 'minted) (setq org-latex-minted-options '(("fontsize" "\\scriptsize") ("linenos" ""))) (setq org-latex-to-pdf-process '("pdflatex -shell-escape -interaction nonstopmode -output-directory %o %f" "pdflatex -shell-escape -interaction nonstopmode -output-directory %o %f" "pdflatex -shell-escape -interaction nonstopmode -output-directory %o %f")) #+end_src # End syntax highlighting setup * About me :B_ignoreheading: :PROPERTIES: :BEAMER_env: ignoreheading :END: #+INCLUDE: "this/zack.org" :minlevel 2 * Software Heritage ** Software Heritage in a nutshell \hfill www.softwareheritage.org #+BEAMER: \transdissolve #+INCLUDE: "../../common/modules/swh-goals-oneslide-vertical.org::#goals" :only-contents t :minlevel 3 ** An international, non profit initiative\hfill built for the long term :PROPERTIES: :CUSTOM_ID: support :END: *** Sharing the vision :B_block: :PROPERTIES: :CUSTOM_ID: endorsement :BEAMER_COL: .5 :BEAMER_env: block :END: #+LATEX: \begin{center}{\includegraphics[width=\extblockscale{.4\linewidth}]{unesco_logo_en_285}}\end{center} #+LATEX: \vspace{-0.8cm} #+LATEX: \begin{center}\vskip 1em \includegraphics[width=\extblockscale{1.4\linewidth}]{support.pdf}\end{center} #+latex:\mbox{}~~~~~~~\tiny\url{www.softwareheritage.org/support/testimonials} *** Donors, members, sponsors :B_block: :PROPERTIES: :CUSTOM_ID: sponsors :BEAMER_COL: .5 :BEAMER_env: block :END: #+LATEX: \begin{center}\includegraphics[width=\extblockscale{.4\linewidth}]{inria-logo-new}\end{center} #+LATEX: \begin{center} #+LATEX: \colorbox{white}{\includegraphics[width=\extblockscale{1.4\linewidth}]{sponsors.pdf}} #+latex:\mbox{}~~~~~~~\tiny\url{www.softwareheritage.org/support/sponsors} #+LATEX: \end{center} ** Status :B_ignoreheading: :PROPERTIES: :BEAMER_env: ignoreheading :END: #+INCLUDE: "../../common/modules/status-extended.org::#archivinggoals" :minlevel 2 #+INCLUDE: "../../common/modules/status-extended.org::#architecture" :minlevel 2 :only-contents t #+INCLUDE: "../../common/modules/status-extended.org::#merkletree" :minlevel 2 #+INCLUDE: "../../common/modules/status-extended.org::#datamodel" :only-contents t #+INCLUDE: "../../common/modules/status-extended.org::#dagdetailsmall" :only-contents t #+INCLUDE: "../../common/modules/status-extended.org::#archive" :minlevel 2 * Querying the archive ** Exploitation #+BEAMER: \LARGE \centering How do you query the Software Heritage archive? #+BEAMER: \Large \\ (on a budget) ** Use cases --- product needs e.g., for https://archive.softwareheritage.org *** Browsing - =ls= - =git log= (Linux kernel: 800K+ commits) *** Wayback machine - tarball - =git bundle= (Linux kernel: 7M+ nodes) *** Provenance tracking - commit provenance (one/all contexts) - requires backtracking - origin provenance (one/all contexts) *** Note We therefore need both the Merkle DAG graph and its *transposed* ** Use cases --- research questions *** For the sake of it - local graph topology - connected component size - enabling question to identify the best approach (e.g., scale-up v. scale-out) to conduct large-scale analyses - any other emerging property *** Software Engineering topics - software provenance analysis at this scale is pretty much unexplored yet - industry frontier: increase granularity down to the individual line of code - replicate at this scale (famous) studies that have generally been conducted on (much) smaller version control system samples to confirm/refute their findings - ... #+INCLUDE: "../../common/modules/dataset.org::#main" :minlevel 2 :only-contents t #+INCLUDE: "../../common/modules/dataset.org::#morequery" :minlevel 2 :only-contents t ** Discussion - one /can/ query such a corpus SQL-style - but relational representation shows its limits at this scale - ...at least as deployed on commercial SQL offerings such as Athena - note: (naive) sharding is ineffective, due to the pseudo-random distribution of node identifiers - experiments with Google BigQuery are ongoing - (we broke it at the first import attempt..., due to very large arrays in directory entry tables) * Graph compression #+INCLUDE: "../../common/modules/graph-compression.org::#main" :minlevel 2 :only-contents t * Conclusion #+INCLUDE: "this/roadmap.org" :minlevel 2 ** Wrapping up #+latex: \vspace{-2mm} *** - Software Heritage archives all public source code as a huge Merkle DAG - Querying and analyzing it at scale (20/300 B nodes/edges) is an open problem - Gold mine of research leads in sw. eng., complex networks, big code, reproducibility #+latex: \vspace{-2mm} *** References #+latex: \vspace{-1mm} #+BEGIN_EXPORT latex \begin{thebibliography}{} \scriptsize \bibitem{Abramatic2018} Jean-François Abramatic, Roberto Di Cosmo, Stefano Zacchiroli \newblock Building the Universal Archive of Source Code \newblock Communications of the ACM, October 2018 \bibitem{Pietri2019} Antoine Pietri, Diomidis Spinellis, Stefano Zacchiroli \newblock The Software Heritage graph dataset: public software development under one roof \newblock MSR 2019: 16th Intl. Conf. on Mining Software Repositories. IEEE \bibitem{Boldi2020} Paolo Boldi, Antoine Pietri, Sebastiano Vigna, Stefano Zacchiroli \newblock Ultra-Large-Scale Repository Analysis via Graph Compression \newblock SANER 2020, 27th Intl. Conf. on Software Analysis, Evolution and Reengineering. IEEE \end{thebibliography} #+END_EXPORT *** Contacts - Stefano Zacchiroli / zack@upsilon.cc / @zacchiro + Stefano Zacchiroli / [[https://upsilon.cc/~zack/][upsilon.cc]] / [[mailto:zack@upsilon.cc][zack@upsilon.cc]] / [[https://twitter.com/zacchiro][@zacchiro]] * Appendix :B_appendix: :PROPERTIES: :BEAMER_env: appendix :END: diff --git a/talks-public/2020-03-24-ensea/this/roadmap.org b/talks-public/2020-03-24-ensea/this/roadmap.org index f4e1bad..604a451 100644 --- a/talks-public/2020-03-24-ensea/this/roadmap.org +++ b/talks-public/2020-03-24-ensea/this/roadmap.org @@ -1,2 +1,62 @@ -** Research roadmap (in brief) - TODO +** A (brief) research roadmap --- 1 +*** Graph compression + - incremental, amortized compression → ongoing UniMi collaboration + - graph query languages on top of the compressed representation → LIRIS + collaboration (early stages) + #+BEAMER: \vfill \pause +*** Complex networks + - local topology of the global VCS graph + - emergent properties (the "classics": scale-free, small world, etc.) + - dynamic modeling of graph evolution over time → collab. with physics @ + UParis +*** + #+BEGIN_EXPORT latex + \vspace{-2mm} + \begin{thebibliography}{} + \small + \bibitem{Pietri2019} Antoine Pietri, Guillaume Rousseau, Stefano Zacchiroli\newblock + Determining the Intrinsic Structure of Public Software Development History\newblock + MSR 2020: 17th Intl. Conf. on Mining Software Repositories. IEEE\newblock + registered study protocol, to appear + \end{thebibliography} + #+END_EXPORT +** A (brief) research roadmap --- 2 + #+BEAMER: \vspace{-2mm} +*** Very-large-scale "big code" + - /big code/ = apply ML/DL to source code and other development byproducts + - current results are language-specific and limited in scale; even the + simplest problems become challenging at this scale and heterogeneity + - lead: scalable language detection → collaboration with UniBo + - lead: project classification → collaboration with CELI + - the VCS graph remains largely unexplored in big code + - lead: apply GNN (Graph Neural Network) for VCS node classification + #+BEAMER: \vspace{-1mm} +*** :B_ignoreheading: + :PROPERTIES: + :BEAMER_env: ignoreheading + :END: + #+BEAMER: \vspace{-1mm} \pause +*** Very-large-scale source code indexing + - common AST-based approaches for code indexing are not viable here due do + maximum heterogeneity + - alternative: treat code as text and full-text index it + - previous exp.: 3-gram based indexing in Debsources, supporting regexp + matching + - goal: find a sweet spot between the two + #+BEAMER: \vspace{-1mm} +** A (brief) research roadmap --- 3 +*** Very-large-scale reproducibility in software engineering + - most results in empirical software engineering are determined on corpuses + significantly smaller than Software Heritage + + → external validity threat; do results generalize to the full body of + public code? + - 2-year research plan + 1) identify impactful sw. eng. studies that can be reproduced using + Software Heritage + - selected topics (tentative): code reuse, code quality, project + classification, technical debt, developer productivity + 2) reproduce selected studies one-by-one, at Software Heritage scale + 3) document findings, e.g., via RENE (REproducibility Studies and + NEgative Results) scientific initiatives + - collaboration with Microsoft Research (early stages) diff --git a/talks-public/2020-03-24-ensea/this/zack.org b/talks-public/2020-03-24-ensea/this/zack.org index df246b8..25b290b 100644 --- a/talks-public/2020-03-24-ensea/this/zack.org +++ b/talks-public/2020-03-24-ensea/this/zack.org @@ -1,8 +1,25 @@ ** About me - Associate Professor (/Maître de conférences/), Université de Paris - on leave (/délégation/) at Inria - Free/Open Source Software activist (20+ years) - Debian Developer & Former 3x Debian Project Leader - Former Open Source Initiative (OSI) director - Software Heritage co-founder & CTO + + #+BEAMER: \vfill \pause + +*** Research path + 1) Formal methods for ensuring the quality of software upgrades (Mancoosi + project) + + Industry adoption: Debian, OPAM, Eclipse P2 + 2) Formal methods for automated upgrade planning in the cloud (Aeolus + project) + + Industry adoption: Mandriva, Kyriba + 3) Large-scale software evolution analysis (Debsources platform) + 4) Very-large-scale source code analysis and preservation (Software + Heritage) + + → this talk