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Re: A project-files implementation for Git projects

From: Tassilo Horn
Subject: Re: A project-files implementation for Git projects
Date: Thu, 03 Oct 2019 19:15:39 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Dmitry Gutov <address@hidden> writes:

> If you have time, could you compare the performance of 'find' and 'git
> ls-files' in the command line? Because when simply redirecting to a
> file I'm seeing a different result:
> $ bash -c "time git ls-files >test"
> real  0m0,011s
> user  0m0,005s
> sys   0m0,006s
> $ bash -c "time find . >test2"
> real  0m0,026s
> user  0m0,008s
> sys   0m0,018s
> That could indicate some inefficiency in processing the output in
> Emacs.

I just tried with the gcc repository with its about 100000 files.  Here
it was about equal with ~30secs for both git and find.  The git ls-files
invocation on the command line with output piped to /dev/null is done in
one tenth of a second.

Oh, when dropping the `expand-file-name' call we're doing on every file,
it's ten times faster (~3secs).


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