Re: Cygwin Git Performance

From: Jeff Hostetler <git@jeffhostetler.com>
Date: May 21, 2019, 21:06 UTC
Message-ID: <5d06cf4a-c29f-335f-52f9-c6c35369b673@jeffhostetler.com>
In-Reply-To: <01cf52cb-7e90-efde-a06c-f0413f9efc8a@gmail.com>

On 5/21/2019 10:34 AM, Nathan and Ila Reynolds wrote:

Show 13 quoted lines

> I am not sure if this is the right mailing list.  If not, please 
> redirect me to the right place.
> 
> I have Cygwin's git (2.21.0) and Git for Windows (2.21.0) installed on 
> my Windows 10 machine.  I run the following command with each binary 
> "git push --all" on a simple 2 line change to 1 file.  If I use Cygwin's 
> git, then the operation takes almost 5 minutes.  If I use Git for 
> Windows, then the operation takes almost 20 seconds.  I tried using 
> --verbose to figure out why Cygwin's git is so slow but it does not 
> reveal anything to me as to why.  What can I do to figure out why 
> Cygwin's git is so slow? I am hoping that we can get to the bottom of 
> this and it can be fixed to help all users.
>

You might try turning on GIT_TRACE_PERFORMANCE [1] and see if that shows any differences.

If you can install 2.22.0-rc* versions of both, you can turn on GIT_TR2_PERF [2] and some additional details.

If your repo is very large, it may be due to some Windows file system optimizations present in the Git for Windows version.

[1] https://git-scm.com/book/en/v2/Git-Internals-Environment-Variables [2] https://github.com/git/git/blob/master/Documentation/technical/api-trace2.txt#L80

Hope that helps, Jeff