This tip introduces the Gentoo Log Parser (genlop), which is a utility to create useful reports from your /var/log/emerge.log file. To get started with genlop, you'll need to install it using the following command: emerge app-portage/genlop.
We can now use genlop to look at the merge history for a package (or your entire system), and to calculate the merge times for various packages. The following example looks at the merge history for Mozilla.
Code Listing 1: Using genlop
% genlop -t mozilla
* net-www/mozilla
Merged at Fri Jan 3 19:29:16 2003 (mozilla-1.2.1-r4)
merge time: 1 hour, 35 minutes and 6 seconds.
Merged at Fri Mar 21 20:59:45 2003 (mozilla-1.2.1-r5)
merge time: 2 hours, 53 minutes and 4 seconds.
Merged at Thu Jun 12 15:55:58 2003 (mozilla-1.3-r1)
merge time: 3 hours, 28 minutes and 37 seconds.
Merged at Wed Jun 25 16:29:38 2003 (mozilla-1.3-r2)
merge time: 2 hours, 43 minutes and 47 seconds.
Merged at Wed Jul 23 18:36:58 2003 (mozilla-1.4)
merge time: 2 hours, 2 minutes and 24 seconds.
Merged at Wed Oct 1 14:49:31 2003 (mozilla-1.4-r3)
merge time: 3 hours, 20 minutes and 38 seconds.
merged totally 6 times in 16 hours, 3 minutes and 36 seconds.
average merge time: 2 hours, 40 minutes and 36 seconds.Note: Type genlop to see the other options available.
From http://www.gentoo.org/news/en/gwn/20031020-newsletter.xml