On Wed, 29 Jun 2011, Anders Kaseorg wrote: > That patch caused an outrageous 40000% performance regression in the > debsums apt hook (/etc/apt/apt.conf.d/90debsums), such that now it takes > several minutes to install anything with apt. > > Before: > $ sudo time /usr/bin/debsums --generate=nocheck -sp /var/cache/apt/archives > 0.35user 0.02system 0:00.48elapsed 75%CPU (0avgtext+0avgdata > 45360maxresident)k > 160inputs+896outputs (0major+37865minor)pagefaults 0swaps > > After: > $ sudo time /usr/bin/debsums --generate=nocheck -sp /var/cache/apt/archives > 148.48user 17.81system 2:57.33elapsed 93%CPU (0avgtext+0avgdata > 45904maxresident)k > 0inputs+0outputs (0major+9347058minor)pagefaults 0swaps > > Is there a way to get this information without running dpkg-query once for > each package?
One can run dpkg-query with multiple arguments to avoid the overhead. But it requires some refactoring of the code I guess. I.e. find out the list of package first, then run dpkg-query on all the packages at the same time. BTW, debsums should really use "dpkg-query --control-path <pkg> md5sums" to know if there's a md5sums file... and if it's lacking it should NOT store it in the dpkg control area but outside in a debsums-specific directory. Because you don't know how dpkg's internal files are organized... Cheers, -- Raphaël Hertzog ◈ Debian Developer Follow my Debian News ▶ http://RaphaelHertzog.com (English) ▶ http://RaphaelHertzog.fr (Français) -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
