[Bug 790043] Re: Bash-completion slows up the start of bash

[Atanas Atanasov]

Hi Bryce,

I should start by saying the execution time of bash-completion depends a
lot of the amount of software installed in any particular computer. I
posted the this bug based on my experience with a laptop which I no
longer have. While the machine was older its specs weren't very bad --
AMD Turion X2 1.8GHz dual core, 2 GB RAM. I just tested bash-completion
on a small server with similar specifications but far less software
installed. Here are the stats.

nasko at chow:~$ time bash /etc/bash_completion

real    0m0.787s
user    0m0.632s
sys     0m0.148s

nasko at chow:~$ time bash empty_script
bash: exit: No such file or directory

real    0m0.007s
user    0m0.008s
sys     0m0.000s

The difference in real execution time is almost 0.8s.

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https://bugs.launchpad.net/bugs/790043

Title:
  Bash-completion slows up the start of bash

Status in “bash-completion” package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: bash-completion

  I have been noticing that bash has unusually slow start-up times.
  After looking into the problem, I found out this is mostly caused by
  the execution of /etc/bash_completion (calls to this exist in several
  places). Of course, removing them speeds up the start but leaves a
  less functional shell. As a work-around I would like to suggest
  starting up /etc/bash_completion in the background. In this way, bash
  will start quickly, have access only to basic built-in completions for
  the first 2 seconds until /etc/bash_completion finishes executing.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: bash-completion 1:1.3-1ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  Architecture: amd64
  Date: Sun May 29 22:43:51 2011
  EcryptfsInUse: Yes
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US.UTF-8:en
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: bash-completion
  UpgradeStatus: Upgraded to natty on 2011-04-24 (35 days ago)

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