bug#8288: vc-git slow on large repository

bug#8288: vc-git slow on large repository

[S Boucher]

find-file and save-buffer are slow.  It appears to be due to vc-git-state.

vc-git-state calls:

     git diff-index -z HEAD -- file.cpp

Which is slow on large git repository, such as webkit.

The question is then whether or not vc-git.el can be more clever than it is now.

I don't have the answer to this.


System:
ubuntu 10.04 64bit
emacs 23.2
git 1.7.0.4
8G of ram
Intel Core i7 (8 processors)

bug#8288: Acknowledgement (vc-git slow on large repository)

[S Boucher]

I think 'git diff-index -z HEAD -- <file>' could be replaced with 'git status -z 
--porcelain <file>' in vc-git-state.

It is 10times faster on a large webkit repository.




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> To: S Boucher <stbya@yahoo.com>
> Sent: Fri, March 18, 2011 3:33:02 PM
> Subject: bug#8288: Acknowledgement (vc-git slow on large repository)
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bug#8288: Acknowledgement (vc-git slow on large repository)

[Andreas Schwab]

S Boucher <stbya@yahoo.com> writes:

> I think 'git diff-index -z HEAD -- <file>' could be replaced with 'git status -z 
> --porcelain <file>' in vc-git-state.

This requires at least git 1.7.0, but it can be replaced by --short in
older versions.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#8288: vc-git slow on large repository

[Jason Merrill]

This issue has been very frustrating for me with GCC git; when the 
repository isn't in the cache saving a file can cause emacs to freeze 
for about 10 seconds.  I work around it with

(defun vc-git-state-heuristic (file)
   "Just claim we're up to date."
   'up-to-date)

bug#8288: Acknowledgement (vc-git slow on large repository)

[Stefan Kangas]

tags 8288 fixed
close 8288 26.1
quit

Andreas Schwab <schwab@linux-m68k.org> writes:
>> I think 'git diff-index -z HEAD -- <file>' could be replaced with 'git status -z
>> --porcelain <file>' in vc-git-state.
>
> This requires at least git 1.7.0, but it can be replaced by --short in
> older versions.

vc-git-state now uses the alternative faster method.

This change was made in:

24301c81 Speed up vc-git-status and make it more precise
Mon, 1 May 2017 03:30:01 +0200 (04:30 +0300)
https://git.savannah.gnu.org/gitweb/?p=emacs.git;a=commit;h=24301c8148f5f3220d7e597c73a59551cfa10eea

I'm therefore closing this bug report.  Please re-open if you
disagree.

Thanks,
Stefan Kangas