Re: Silly Question About Timing

From: Hilco Wijbenga <hilco.wijbenga@gmail.com>
Date: Feb 9, 2012, 21:48 UTC
Message-ID: <CAE1pOi14LW6ayNiRd2KogKZn2zLMbRsTS1kkMFgFBtx5J=yFNA@mail.gmail.com>
In-Reply-To: <201202092116.q19LGnTY024797@no.baka.org>

On 9 February 2012 13:16, Seth Robertson <in-gitvger@baka.org> wrote:

Show 15 quoted lines

>
> In message <CAE1pOi1+FQNoPZ_P-fmFx-YhnUYzMQT=6zh3s-OyT71vcDm=wQ@mail.gmail.com>, Hilco Wijbenga writes:
>
>    I've noticed that entering a Git controlled project directory takes
>    quite some time so I wanted to measure exactly how much (it's the
>    prompt I'm using that's taking the time, I suspect). I first tried (a
>    bit naive, I admit :-) )
>
>    time cd my-project
>
> Your confusion is because you are measuring the wrong thing.  I'm
> assuming, here, that you have a shell prompt which is giving you all
> sorts of status about the git repository.  The "cd" operation is
> instantaneous, it is the shell attempting to compute the new prompt
> which is slow.

Yes, exactly.

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> Exactly how your shell does this is shell dependent, but you might
> want to look at your setting of $PROMPT_COMMAND.  Then you can test it
> by running something like:
>
> time sh -c "cd git-directory; $PROMPT_COMMAND"

I tried that and it's still instantaneous.

The culprit is

export PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \W$(__git_ps1 " (%s)")\$\[\033[00m\] '

but I can't get that to run. Simply running

echo $PS1

doesn't work and I have been unable to get the __git_ps1 part to do anything.