[Bug 1461652] Re: dpkg-deb slow when building large packages

[Dan Kegel]

When I backtrace it, it's spending a lot of time in

lzma_code () from /lib/x86_64-linux-gnu/liblzma.so.5

and children.  strace shows lots of I/O going on.  So it
appears to be compression overhead.

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Title:
  dpkg-deb slow when building large packages

Status in dpkg package in Ubuntu:
  Confirmed

Bug description:
  Building a 100 megabyte -dbg package (don't laugh, debugging symbols can get quite large)
  takes an extra five to ten minutes in dpkg-deb.  ps shows e.g.

  USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
  dank      6207 99.6  0.7 114984 95736 pts/31   R+   11:11   5:00 dpkg-deb --build debian/foo-dbg ..

  This is nothing new, but it is always irritating.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: dpkg 1.17.5ubuntu5.4
  ProcVersionSignature: Ubuntu 3.13.0-53.89-generic 3.13.11-ckt19
  Uname: Linux 3.13.0-53-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Jun  3 11:19:12 2015
  SourcePackage: dpkg
  UpgradeStatus: No upgrade log present (probably fresh install)

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