Current Releases

RankDistroCodename% LatestAvg # Newer RelsAvg Lag
1 arch56.25%1.944w
2 fedora2136.66%1.436w
3 gentoo34.37%8.0329w
4 funtoo34.37%8.0329w
5 freebsd10.126.66%23.3075w
6 ubuntuutopic21.87%8.1318w
7 sabayon521.87%5.4433w
8 slackware14.110.52%9.6850w
9 opensuse13.16.45%13.7151w
10 debianwheezy6.25%31.69116w

Future Releases

RankDistroCodename% LatestAvg # Newer RelsAvg Lag
1 gentoo56.25%1.539w
2 arch56.25%1.944w
3 funtoo56.25%1.539w
4 opensuse13.253.12%3.9410w
5 ubuntuvivid46.87%11.9118w
6 debianjessie37.5%3.9113w
7 fedora2233.33%1.637w
8 slackwarecurrent31.57%6.9529w
9 freebsd10.127.58%22.0356w
10 sabayon521.87%5.4132w


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.


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.