10 Distributions
204,258 Total Packages
4,674,106 Releases
3,235 Upstream Packages
Current Releases
Rank Distro Codename % Obsolete Avg # New Rels Avg Lag
1 arch 39.39% 1.52 2w
2 ubuntu trusty 66.66% 12.91 10w
3 fedora 20 67.74% 3.19 11w
4 gentoo 69.69% 10.15 22w
5 funtoo 69.69% 10.24 23w
6 debian wheezy 81.81% 21.15 76w
7 sabayon 5 81.81% 23.27 28w
8 slackware 14.1 84.21% 11.11 31w
9 freebsd 9.2 90.0% 55.37 88w
10 opensuse 13.1 90.62% 14.28 32w
Future Releases
Rank Distro Codename % Obsolete Avg # New Rels Avg Lag
1 arch 30.30% 1.24 1w
2 gentoo 36.36% 1.39 2w
3 funtoo 36.36% 1.39 2w
4 debian jessie 42.42% 5.48 9w
5 opensuse 13.1 46.87% 5.03 10w
6 ubuntu trusty 63.63% 18.03 19w
7 slackware current 73.68% 4.26 21w
8 fedora 21 77.41% 3.42 12w
9 sabayon 5 81.81% 23.30 28w
10 freebsd 9 89.65% 59.10 71w
What
If Subversion's latest releases are:
03/20/09 1.6.0
02/27/09 1.5.6
12/22/08 1.5.5
10/24/08 1.5.4

And say gentoo stable is at 1.5.5 on 03/23/09.

Then the lag is 3/23/09-2/27/09, the time between now and the oldest new release.

Thus, the lag is 24 days.
Much of the analysis of the gathered data is centered around a notion of downstream lag. That is, for any given point in time a distribution's package version lags behind by the time difference between now and the oldest new release.

Around the site you will find many graphs that display the downstream lag over time. Most average the lag over a number of packages to gather a greater sense of a distribution's tendencies.
About
OpenSourceWatershed is a project aimed at understanding the relationship between distributions (downstream) and the individual software components (upstream). It is the basis for a larger study of distributions and their evolution. It is distrology.

The aggregate analysis is done over a variety of packages. The three forms of analysis are percent obsolete, the average number of newer releases per package and the time since the oldest new release. In other words the lag is the amount of time a distro had to move to a newer package.

There are errors in the database which you can help fix. Just email the mailing list if you find one. Join the GoogleGroup to get notified of improvements to the site. Individual packages can be tracked using RSS feeds by clicking the feed icon next to each package name. For more information about the process behind this analysis please read my senior thesis or email me.

©2013 Scott Shawcroft | CC-by 3.0 US - contact - git - changes - list