[Bash-completion-devel] After adding bash-completion to .bashrc loading prompt is slow

[David Paleino]

On Tue, 05 Apr 2011 19:47:53 +0300, Ville Skyttä wrote:

> On 04/05/2011 09:36 AM, David Paleino wrote:
> 
> [..]
> > I'll check which third-party completion is being so slow for me (and
> > eventually report bugs where appropriate).
> 
> Just a thought, I haven't actually checked how bash behaves under the
> hood: if loading the completions on your system is heavily I/O bound,
> and the changes I made (have foo || return) just help with the CPU
> pressure, the savings won't be that noticeable.
> 
> Can you find out whether the loading process is CPU or I/O bound on your
> system?

How?

> FWIW both the systems I tested with have their filesystems mounted with
> noatime (one has ext4, the other ext3).  That might be worth trying out
> if you don't already have it.

I'll try, thanks.

> [..]
> > For
> > Debian-based systems I'm thinking at some post-installation hook, which
> > checks what's been installed in $PATH, and makes appropriate links to
> > $BASH_COMP_DIR. I'll need to think this better though.
> 
> I don't know if Debian has a concept of package triggers, but that
> mechanism works pretty well for rpm based systems in this case.  E.g.
> "when you install package foo, we know/assume it will contain these
> commands, symlink their completions to BASH_COMPLETION_DIR" and
> similarly for package removals.

Yes, we have something like that. I haven't implemented it yet though,
because: a) lack of time, b) I've never done it, so I must document myself
thoroughly before doing anything :), c) I should move completions out of
BASH_COMPLETION_DIR (so maybe I'll start the layout redesign we want to do
upstream in the Debian package).

I really just need an afternoon or two to get all this :). Maybe today I'll
do ;)

> Here's the current Fedora specfile for reference:
> http://pkgs.fedoraproject.org/gitweb/?p=bash-completion.git;a=blob;f=bash-completion.spec

Thanks, I'll have a look.

David

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