10.45-11.45

• Rasmus Pedersen (CBS) - Firmware replacements on Lego Mindstorms NXT
  

  LEGO recently released the LEGO Mindstorms NXT as a completely open source system. This makes it possible to replace or enhance the existing operating system using open source tools such as the gcc compiler. To program NXT requires a little understanding of electronics and embedded systems, and this will be covered in the talk. It will both be demonstrated how to compile the existing operating system and how to replace the operating system with some other operating system. The tools we use are mainly Eclipse, Ubuntu or Win XP, and a so-called crosscompiler for gcc targeting the microprocessor architecture in LEGO Mindstorms NXT.

  Rasmus Ulslev Pedersen is Assistant Prof. at Dept. of Informatics Copenhagen Business School. He released the first open source tool chain for LEGO Mindstorms NXT and he is member of the MINDSTORM Community Partners program.

• Morten Kristoffer Hansen: The Software Exchange, Softwarebørsen
  

  The Software Exchange, Softwarebørsen, was created to facilitate the use of open source as a strategic development model in the Danish public sector. The talk will give insight into how to use The Software Exchange either as a public agency sharing and reusing components, or a company offering services around the components.

  Morten Kristoffer Hansen is head of section in The National Software Knowledge Centre, where he among other things maintains The Software Exchange.

• Arne Jørgensen: Drupal-experiences and considerations
  

  Drupal has gained a lot of popularity over the last few years - and the media industry is no exception.
  Berlingske Media currently runs 7 Drupal-installations serving 31 sites - and more coming soon.
  This lightning talk will focus on the experiences we have developing news and media sites in Drupal and our thoughts for the future.

  Arne Jørgensen is softwarearchitect at Berlingske Media.

12.00-12.55

• Julia Lawall (DIKU): Automating Evolution and Bug Fixing using Coccinelle
  

  Libraries ease software development, in that they can encapsulate complex, commonly used functionalities. Nevertheless, when library APIs evolve substantial maintenance may be required to bring library clients up to date with the evolutions. Furthermore, library APIs may not be completely understood by programmers, leading to bugs that may appear at most usage sites across a system. To address these problems, there is a need for an approach to easily find and update instances of various programming idioms across a body of code.

  At the University of Copenhagen and the Ecole des Mines de Nantes (France), we have been developing such a system, named Coccinelle. Coccinelle has been extensively applied to recent versions of the Linux kernel, to update code in response to API evolutions and to find and fix bugs. A unique feature of Coccinelle is that transformations are specified using a variant of the patch notation, and thus follow very closely the source code. In this talk, we will briefly present Coccinelle and illustrate its features using a few examples drawn from our work on Linux code.

  Biography: Julia Lawall is a Lektor at DIKU (University of Copenhagen). She works in the area of programming languages, with an interest in applications to systems code. She is one of the principal developers of Coccinelle.

• Kristian Nielsen: Optimizing Large Databases Using InnoDB Clustered Indexes (Expert level)
  

  When the database no longer fits within main memory of the database server, disk I/O usually becomes a bottleneck in OLTP (on-line transactional processing) applications. One of the primary techniques to speed up such workloads in MySQL when using the InnoDB storage engine is to utilise InnoDB clustered indexes. This talk will explain how to use clustered indexes to greatly improve performance of a common kind of disk-bound load in typical web applications, and go through an concrete example of how the use of clustered indexes gives a factor of 13 speedup on a 20 Gb, 50 million row database.

  Kristian Nielsen has been developing Free Software since 1990. He is the original author of chan_ss7 and McStas, and has worked on MySQL, wine, and DBD::Oracle, among others. He is currently working as an independent software professional. Blog: http://kristiannielsen.livejournal.com/

• Kristian Nielsen: Profiling with OProfile and Intel Core 2 performance counters (Expert level)
  

  When performance becomes a problem, and before starting to optimize the code, it is time to pull out the profiler and measure performance to identify where the bottlenecks are. OProfile is an excellent GPL'ed profiler for Linux. It can be used to profile both user-applications, system libraries, and kernel code. It can measure simply CPU time spent, or it can use the performance counters of modern CPUs to measure cache misses, branch mispredictions, execution unit stalls, etc. The talk will show basic usage, and go through some interesting profiling results from a variety of applications, showing how to interpret the results.

  Kristian Nielsen has been developing Free Software since 1990. He is the original author of chan_ss7 and McStas, and has worked on MySQL, wine, and DBD::Oracle, among others. He is currently working as an independent software professional. Blog: http://kristiannielsen.livejournal.com/

13.00-13.55

• Juri Rischel Jensen: From Sysadmin to Puppetmaster
  

  In this talk, Juri Rischel Jensen describes how his job as a Systems Administrator has changed over the years. From a getting-your-hands-dirty job where all the work with configuring servers were done manually on the nodes, it has gradually changed to be a process where the configuration is described beforehand and the grunt work applying it, is done by the server itself.

  While doing the configuration of Unix servers manually is ok, when there's 1 or 2, it quickly becomes almost unmanageable when the number of servers rises above a certain threshold. Using Puppet to automate all the configuration work from the point of the initial deployment of the server, you can get systems with a consistent configuration, regardless of the number of servers in your network.

  Puppets OS-agnostic language lets you define how you want your setup to be, without worrying about which os you'll be using in the end. You define the setup once and let Puppet do the repetitive task of ensuring that your servers configuration matches your definition.

  With Puppet, the job as a Systems Administrator has suddenly become more interessting and more fun, than it has ever been before.

• Anne Østergaard: Free Software in Education
  

  Successful school and education projects from kindergarten to your Master Degree in Free and Open Source Software. An overview.

  Today millions of individuals take the possibility of using Free Software for granted at school as well as at home. This is especially the case in poorer regions of the world.

  Millions in the so called "developed countries" are still missing this opportunity.

  Are the developed countries and the developing countries about to change places due to the advantages Free Software has to offer its users?

• Niels Jensen (Chairman of Slangerup Church Council, Slangerup, Denmark): From paper based files to electronic filing in a church office
  

  Within the last 2-3 years Slangerup Church Office has move from a completely paper based filing system to electronic filing of all incomming and outgoing correspondance related to Church Council matters. This talk with present the hardware and software infracture for this which, and discuss issues such as backup of archieved documents and remote access to the documents using tools such as Samba and openVPN running on top of openSUSE 11.

  Document capture is done using scan-to-email on a commercial multfunction printer-copier-scanner. The e-mail infrastructure of the church council allows e-mail to be forwarded to both a members personal account, and to a Google Apps e-mail account. One of these Google Apps e-mail accounts is also an archieve account, to which only a trusted employee has access.

  Currently scanned dokuments are manually filed into a simple folder structure by the Councils computer ressource person. The main document archieve "SK_Arkiv" is devided in to number of folders "Post", "MR" etc. Through Samba all employees and council members have access to the "Post"-folder, and all council members have access to the "MR" folder.

  A daily backup of "SK_Arkiv" is performed using rdiff-backup running as a cron job. This backup os to a secondary HD on the same openSUSE 11 system, which house the archieve. Once a month a copy of "SK_Arkiv" is burned to a DVD for storage in a fire safe box.

  The Samba access to "Post", which include subfolders for each year since 2000 as well as folder for posters for church events and programmes for church events. This allows our church servant to print out the needed posters and/or programmes on her own Windows XP Home based computer.