Thanks Ferdinand, this helped a lot. Quick PoC with installing/purging a samba4 (13.5MB):
# grep btrfs /proc/mounts && uname -r /dev/sda2 / btrfs rw,nodev,noatime 0 0 2.6.35-27-generic # sysctl -w vm.drop_caches=3 # time (LD_PRELOAD=/usr/local/lib/libnosync.so apt-get -y install samba4 && sync) real 0m31.115s user 0m1.620s sys 0m3.150s # time (LD_PRELOAD=/usr/local/lib/libnosync.so apt-get -y purge samba4 && sync) real 0m30.940s user 0m1.370s sys 0m2.690s # sysctl -w vm.drop_caches=3 # time (apt-get install samba4 && sync) real 0m41.611s user 0m1.530s sys 0m3.250s # time (apt-get purge -y samba4 && sync) real 0m40.015s user 0m1.390s sys 0m2.850s And this is reproducible: so it's always 30 or 31 seconds with libnosync and always ~10sec more w/o libnosync. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/607632 Title: DPKG is very slow when using BTRFS -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
