Re: [PATCH] git-gui: Perform rescan on window focus-in

[Pratyush Yadav <me@yadavpratyush.com>]

On 29/07/19 7:58 AM, Mark Levedahl wrote:
> On 7/28/19 6:49 PM, brian m. carlson wrote:> On 2019-07-28 at 22:10:29, 
> Pratyush Yadav wrote:
>  >> The function is not documented, and I only started spelunking the 
> code a
>  >> couple days back, so I'll try to answer with what I know. It might 
> not be
>  >> the full picture.
>  >>
>  >> Running git-gui --trace, these commands are executed during a rescan:
>  >>
>  >> /usr/lib/git-core/git-rev-parse --verify HEAD
>  >> /usr/lib/git-core/git-update-index -q --unmerged --ignore-missing 
> --refresh
>  >>
>  >
>  > Great. This sounds like a well-reasoned change. I'll let other folks who
>  > use git-gui more chime in to see what they think as well.
>  >
> 
> I'm assuming this does what is currently done by F5.
> A simple rescan from git-gui in the git repository takes about 8 seconds 
> on my corporate laptop running Windows, making this happen on change of 
> window focus is definitely not a friendly change from my view point.
> 

This is a Windows problem maybe? On my Linux machine with an almost dead 
hard drive, it takes under 10ms to do a refresh on the git repository 
(which has about 56,000 commits).

Can you check what takes so long? I don't use Windows or I'd do this myself.

Go to git-gui.sh and add some prints to the rescan procedure (line 1450) 
to trace which operation takes time. It is not a shell script, but a tcl 
script, so you'd need to add "puts <your_string_here>" just to have an 
approximate idea of what takes so long.

Can someone else who uses git-gui comment on the time taken to rescan on 
the git repo (on Windows, Linux, or Mac)?

You can use this to see how long it takes to do a rescan. It will print 
the time taken to stdout:

-- >8 --
diff --git a/git-gui/git-gui.sh b/git-gui/git-gui.sh
index 8ca2033dc8..7f2962f060 100755
--- a/git-gui/git-gui.sh
+++ b/git-gui/git-gui.sh
@@ -2360,7 +2360,11 @@ proc do_rescan {} {
  }

  proc ui_do_rescan {} {
+	set t [clock milliseconds]
  	rescan {force_first_diff ui_ready}
+	set t2 [clock milliseconds]
+
+	puts "Time elapsed in ui_do_rescan = [expr $t2 - $t]ms"
  }

  proc do_commit {} {
-- >8 --

-- 
Regards,
Pratyush Yadav