[Bug 1663749] Re: Backport "libdpkg: Only preallocate disk size for files bigger than 16 KiB".

[Łukasz Zemczak]

I was asked to test this bug on a slower non-SSD disk. Checked zesty,
yakkety and xenial. The detailed test result:

zesty:
- 1.18.10ubuntu1:
real    0m39.559s
user    0m7.176s
sys 0m8.780s
- 1.18.10ubuntu2:
real    0m20.273s
user    0m6.096s
sys 0m7.164s

yakkety:
- 1.18.9ubuntu2
real    0m38.154s
user    0m7.008s
sys 0m9.112s
- 1.18.10ubuntu1.1
real    0m24.107s
user    0m6.028s
sys 0m7.116s

xenial:
- 1.18.4ubuntu1
real    0m41.030s
user    0m8.164s
sys 0m8.632s
- 1.18.4ubuntu1.2
real    0m19.263s
user    0m6.792s
sys 0m5.644s

Retried a few times afterwards to make sure the results are
reproducible. With this, I consider the bug as verified for both stable
releases.

** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/1663749

Title:
  Backport "libdpkg: Only preallocate disk size for files bigger than 16
  KiB".

Status in dpkg:
  Fix Released
Status in dpkg package in Ubuntu:
  Fix Released
Status in dpkg source package in Xenial:
  Fix Committed
Status in dpkg source package in Yakkety:
  Fix Committed

Bug description:
  Please backport upstream dpkg patch "libdpkg: Only preallocate disk
  size for files bigger than 16 KiB" to xenial, yakkety, and zesty
  versions of dpkg.

  dpkg 1.17.11 commit "dpkg: Try to preallocate the disk size for
  extracted files" causes installs of packages with many small files to
  be slow.
  https://anonscm.debian.org/git/dpkg/dpkg.git/commit/?id=87b0b20b86407baf1deb4e91b3fd839e01228ac8

  This was fixed in dpkg 1.18.15 with "libdpkg: Only preallocate disk
  size for files bigger than 16 KiB".
  https://anonscm.debian.org/git/dpkg/dpkg.git/commit/?id=a971ad91437af8880cad4703695dcf12ee45959b

  trusty dpkg is based off 1.17.5 and is not affected. xenial dpkg based
  off 1.18.4, yakkety dpkg based off 1.18.10, and zesty dpkg based off
  1.18.10 need the fix.

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