Re: git-annotate efficiency

[Ryan Anderson <ryan@michonline.com>]

On Fri, Feb 24, 2006 at 01:00:24PM -0500, Morten Welinder wrote:
> It looks like handle_rev is seeing the same revisions over and over again.
> I don't know why that would be, but the following patch just skips dups.
> I have no idea if it is right, though.

Merges.

a--b--c--d--f
   \-g--h--/

It would do f,d,c,b,a + f,h,g,b,a

So yes, this fix is correct, and Junio, I'll be doing some changes this
weekend and send it along with a few other things.

(On a medium-sized test tree at work with 3500 commits in the tree, 37
on the main Makefile (6 merges), this cuts the annotate time from 10s to a little
over 2, so it's, umm, very worthwhile.)

> 
> Morten
> 
> 
> diff --git a/git-annotate.perl b/git-annotate.perl
> index 3800c46..a5e2d86 100755
> --- a/git-annotate.perl
> +++ b/git-annotate.perl
> @@ -117,7 +117,10 @@ sub init_claim {
> 
>  sub handle_rev {
>         my $i = 0;
> +       my %seen = ();
>         while (my $rev = shift @revqueue) {
> +               next if $seen{$rev};
> +               $seen{$rev} = 1;
> 
>                 my %revinfo = git_commit_info($rev);
> -
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-- 

Ryan Anderson
  sometimes Pug Majere