10 Distributions
214,484 Total Packages
4,954,528 Releases
3,252 Upstream Packages
Current Releases
Rank Distro Codename % Latest Avg # Newer Rels Avg Lag
1 arch 78.12% 0.97 1w
2 gentoo 34.37% 8.44 30w
3 funtoo 34.37% 8.44 30w
4 freebsd 10.1 26.66% 16.87 67w
5 ubuntu utopic 25.0% 3.75 11w
6 fedora 20 20.0% 5.93 25w
7 sabayon 5 18.75% 10.03 32w
8 slackware 14.1 15.78% 9.32 42w
9 opensuse 13.1 12.90% 9.13 42w
10 debian wheezy 6.25% 30.53 109w
Future Releases
Rank Distro Codename % Latest Avg # Newer Rels Avg Lag
1 gentoo 78.12% 1.88 9w
2 arch 78.12% 0.97 1w
3 funtoo 78.12% 1.88 9w
4 opensuse 13.2 65.62% 2.56 8w
5 ubuntu vivid 56.25% 8.22 15w
6 debian jessie 53.12% 5.78 8w
7 slackware current 42.10% 5.89 24w
8 freebsd 10.1 27.58% 15.38 49w
9 fedora 21 20.0% 5.93 25w
10 sabayon 5 18.75% 10.00 30w
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 latest, 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