We are working on integrating neuroscience research software into the Debian operating system for almost six years now. Occasionally looking at the repository web server logs, we knew that a growing number of people were using the packages from http://neuro.debian.net for their Debian and Ubuntu machines. However, we never really looked deeper.
For our upcoming booth at HBM2011 we need something like a presentation or slides that could run in a loop on a big screen to attract people. It would need to be visually appealing, but also informative. As slides are rather boring, we looked into creating an animation – a visualization of our repository download statistics.
There are many boring ways to visualize this type of data, but there is also at least one that is cool enough to yield an appealing, almost mystical, animation: code_swarm. This great software can visualize somewhat “social” processes based on commit statistics of source code repositories. It extracts information on who is working on which files of a project at any given point in time, and visualizes similarities in these patterns. People that work on the same files in temporal proximity cluster together, and files that are modified by the same people cluster together. From all this information code_swarm generates beautiful animations.
Download statistics are not that different from commit statistics. Instead of “Who is modifying what?” it is simply: “Who is downloading what?” So we gathered all Apache logs of binary package downloads from our repository over the last two years. We converted the data so that the corresponding source package, became the “author” of a commit/download, and encoded the associated IPv4 address (the last 8 bit truncated) together with the target distribution as the “modified file”. And code_swarm did the rest (try watching in 480p or above):
Few notes on the video: The animation shows some spikes in the download activity. Most of the big ones are related to new releases of FSL. FSL is undoubtedly our most popular package. First and foremost, because it is one of the standard tools for brain-imaging research, but also, because upstream completely relies on NeuroDebian for deploying FSL on the Debian platform.
It looks like the majority of our downloads comes from countless Ubuntu machines – maybe laptops and desktops with dynamic IPs. However, there are also fairly/large deployments of Debian 6.0 (white) and Ubuntu 10.04 (light blue) with static addresses – probably labs at research institutions. Watch for the large “stars” towards the end.
You might have noticed the yellow dots. These are downloads from the data suite of the NeuroDebian which we use to improve space-efficiency of our repository. This suite has packages (sometimes the size of 1GB in compressed form) that can be installed on any Debian or Ubuntu release and contain only data of various types and formats. Of course many applications depend on these packages, hence you can see some dots constantly changing color between yellow and one of the release colors.
PS: OpenShot became an amazing video editor!