On Fri, 29 Jul 2011, Nicolas STRANSKY wrote: > Simplistic tests involving "tar" show that the disk is able to produce > throughputs that are about 30x higher than the ones I observe when dpkg > is unpacking files (60MB/s vs. 2MB/s). I have tried a couple > workarounds but they didn't change anything: using dpkg with > --force-unsafe-io or mounting / with nodatacow.
Did you try running your apt-get under eatmydata? If it solves your issue it means the slowness is the result of the fsync() that dpkg is doing. And I heard it multiple times that btrfs was not very efficient when you are doing lots of fsync() but I am afraid there's not much we can do to improve this if we want to keep the reliabily of dpkg in general. 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
