Reopening this bug since -ubuntu4 has reintroduced it. It may not be as
bad as before, since cjwatson said on irc that syncing is now only
performed after unpacking all files in a single package, but I just
tested upgrading beta 2 to current and the time to upgrade went from
6m21s to 11m15s.
To test I made a clean install of beta 2 to a new lv on my ssd, booted
into the new install, ran apt-get update ; apt-get upgrade -d to
download all the files needed. Then I booted back to my main install
and made a backup of the test volume using dd. Booted back into test
system and locked the version of dpkg to -ubuntu3 and ran a time apt-get
upgrade -y. I then booted my main system and restored the dd backup,
booted back into the test volume, and first upgraded dpkg to -ubuntu4,
then again ran time apt-get upgrade -y.
It seems that this "fix" may be to solve a problem caused by people
using data=writeback mount option on ext4, which is documented to be
unsafe, and comes at a hefty cost to upgrade a number of packages at
once. Because of this I feel this fix should be reverted.
** Changed in: dpkg (Ubuntu Lucid)
Status: Fix Released => Triaged
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My computer updates are very slow since latest dpkg update
https://bugs.launchpad.net/bugs/537241
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