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Date: Fri, 14 Oct 2011 10:31:00 -0000
From: Eli Zaretskii <eliz@gnu.org>
Subject: Re: GIT and CVS
In-reply-to: <20111013222440.GA15789@host1.jankratochvil.net>
To: Jan Kratochvil <jan.kratochvil@redhat.com>
Cc: ams@gnu.org, pmuldoon@redhat.com, joseph@codesourcery.com, gdb@sourceware.org
Reply-to: Eli Zaretskii <eliz@gnu.org>
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> Date: Fri, 14 Oct 2011 00:24:41 +0200
> From: Jan Kratochvil <jan.kratochvil@redhat.com>
> Cc: ams@gnu.org, pmuldoon@redhat.com, joseph@codesourcery.com,
>         gdb@sourceware.org
> 
> On Fri, 14 Oct 2011 00:08:35 +0200, Eli Zaretskii wrote:
> > ??? When did you last use "git annotate"? and on what project?
> 
> Depending on what I do sometimes ~10x a day during complicated GDB backports.
> 
> 
> > That command is notoriously slow in git.  E.g., it takes a whopping 4.5
> > minutes to run on a particularly large and history-rich file in the Emacs
> > repository.
> 
> The most expensive source file in GDB looks to be dwarf2read.c: 0m8.930s

On fencepost.gnu.org, I get 18 to 20 seconds on that file.

I guess this also depends on the number of revision that the project
has.  GDB has 36544 (if my git command was correct ;-); Emacs has
106K.  And the file I was talking about, xdisp.c, has 1592 revisions
in its history, not 573 as dwarf2read.c.

So this problem is probably still in GDB's future.  But it is real
nonetheless.