Git status and status.submoduleSummary = very slow (windows 10)

[neoncom]

• [X ] I was not able to find an open or closed issue matching what I'm seeing

Setup

• Which version of Git for Windows are you using? Is it 32-bit or 64-bit?

$ git --version --build-options

git version 2.21.0.windows.1
cpu: x86_64
built from commit: 2481c4cbe949856f270a3ee80c802f5dd89381aa
sizeof-long: 4
sizeof-size_t: 8

• Which version of Windows are you running? Vista, 7, 8, 10? Is it 32-bit or 64-bit?

$ cmd.exe /c ver

Microsoft Windows [Version 10.0.17763.503]
64 bit

• What options did you set as part of the installation? Or did you choose the
  defaults?

# One of the following:
> type "C:\Program Files\Git\etc\install-options.txt"
> type "C:\Program Files (x86)\Git\etc\install-options.txt"
> type "%USERPROFILE%\AppData\Local\Programs\Git\etc\install-options.txt"
$ cat /etc/install-options.txt

Editor Option: VisualStudioCode
Custom Editor Path:
Path Option: Cmd
SSH Option: OpenSSH
CURL Option: OpenSSL
CRLF Option: CRLFAlways
Bash Terminal Option: MinTTY
Performance Tweaks FSCache: Enabled
Use Credential Manager: Enabled
Enable Symlinks: Disabled

• Any other interesting things about your environment that might be related
  to the issue you're seeing?

YES!!!!
issue only occurs if the following config option is set
[status]
submoduleSummary = true

Details

• Which terminal/shell are you running Git from? e.g Bash/CMD/PowerShell/other

tried with cmd, ps and git bash, same problem

• What commands did you run to trigger this issue? If you can provide a
  Minimal, Complete, and Verifiable example
  this will help us understand the issue.

create new folder
cd into folder
git init .
git status <- takes about 3-4 secs to complete

• What did you expect to occur after running these commands?

instant git status execution

• What actually happened instead?

git status takes 3-4 secs to complete

[dscho]

I can confirm. Using this MCVE:

git init submodule-summary-test
cd submodule-summary-test
git config status.submoduleSummary true
GIT_TRACE=1 git status

I get this:

16:54:05.175244 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/bin
16:54:05.175244 git.c:439               trace: built-in: git status
16:54:05.185144 run-command.c:663       trace: run_command: GIT_INDEX_FILE=.git/index git submodule summary --cached --for-status --summary-limit -1 HEAD
On branch master

No commits yet

16:54:05.200291 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.205340 git.c:704               trace: exec: git-submodule summary --cached --for-status --summary-limit -1 HEAD
16:54:05.205340 run-command.c:663       trace: run_command: git-submodule summary --cached --for-status --summary-limit -1 HEAD
16:54:05.345001 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.495069 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.500090 git.c:704               trace: exec: git-sh-i18n--envsubst --variables 'usage: $dashless $USAGE'
16:54:05.500090 run-command.c:663       trace: run_command: git-sh-i18n--envsubst --variables 'usage: $dashless $USAGE'
16:54:05.515062 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.554932 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.554932 git.c:704               trace: exec: git-sh-i18n--envsubst 'usage: $dashless $USAGE'
16:54:05.554932 run-command.c:663       trace: run_command: git-sh-i18n--envsubst 'usage: $dashless $USAGE'
16:54:05.574854 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.694986 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.694986 git.c:439               trace: built-in: git rev-parse --git-dir
16:54:05.764855 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.764855 git.c:439               trace: built-in: git rev-parse --git-path objects
16:54:05.825152 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.825152 git.c:439               trace: built-in: git rev-parse -q --git-dir
16:54:05.915305 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.915305 git.c:439               trace: built-in: git rev-parse --show-prefix
16:54:05.954939 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:05.954939 git.c:439               trace: built-in: git rev-parse --show-toplevel
16:54:06.049507 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.051508 git.c:439               trace: built-in: git rev-parse -q --verify --default HEAD HEAD
16:54:06.095263 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.095263 git.c:439               trace: built-in: git hash-object -w -t tree --stdin
16:54:06.146443 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.147444 git.c:439               trace: built-in: git rev-parse --show-toplevel
16:54:06.184819 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.184819 git.c:439               trace: built-in: git rev-parse --sq --prefix  --
16:54:06.235090 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.235090 git.c:439               trace: built-in: git diff-index --cached --ignore-submodules=dirty --raw 4b825dc642cb6eb9a060e54bf8d69288fbee4904 --
16:54:06.320252 run-command.c:663       trace: run_command: GIT_INDEX_FILE=.git/index git submodule summary --files --for-status --summary-limit -1
16:54:06.334962 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.339984 git.c:704               trace: exec: git-submodule summary --files --for-status --summary-limit -1
16:54:06.339984 run-command.c:663       trace: run_command: git-submodule summary --files --for-status --summary-limit -1
16:54:06.475068 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.614930 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.614930 git.c:704               trace: exec: git-sh-i18n--envsubst --variables 'usage: $dashless $USAGE'
16:54:06.614930 run-command.c:663       trace: run_command: git-sh-i18n--envsubst --variables 'usage: $dashless $USAGE'
16:54:06.634869 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.675141 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.675141 git.c:704               trace: exec: git-sh-i18n--envsubst 'usage: $dashless $USAGE'
16:54:06.675141 run-command.c:663       trace: run_command: git-sh-i18n--envsubst 'usage: $dashless $USAGE'
16:54:06.684846 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.815222 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.815222 git.c:439               trace: built-in: git rev-parse --git-dir
16:54:06.874756 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.885094 git.c:439               trace: built-in: git rev-parse --git-path objects
16:54:06.935004 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:06.935004 git.c:439               trace: built-in: git rev-parse -q --git-dir
16:54:07.015112 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:07.024841 git.c:439               trace: built-in: git rev-parse --show-prefix
16:54:07.054853 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:07.054853 git.c:439               trace: built-in: git rev-parse --show-toplevel
16:54:07.157265 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:07.158263 git.c:439               trace: built-in: git rev-parse -q --verify --default HEAD
16:54:07.205155 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:07.205155 git.c:439               trace: built-in: git hash-object -w -t tree --stdin
16:54:07.245191 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:07.245191 git.c:439               trace: built-in: git rev-parse --show-toplevel
16:54:07.290563 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:07.292559 git.c:439               trace: built-in: git rev-parse --sq --prefix  --
16:54:07.334977 exec-cmd.c:238          trace: resolved executable dir: C:/Program Files/Git/mingw64/libexec/git-core
16:54:07.345117 git.c:439               trace: built-in: git diff-files --ignore-submodules=dirty --raw --
nothing to commit (create/copy files and use "git add" to track)

As you can see, most of the time is spent in git submodule, which is a Unix shell script (and it is known that the Unix shell scripts are interpreted very slowly by the MSYS2 Bash that is used by Git for Windows).

The only remedy would be to re-implement git-submodule.sh in pure C, something that was started a couple of years ago, but has stalled in the meantime.

Traditionally, projects like this one are best driven forward by users who really care about it.

@neoncom how's your C fu?

[neoncom]

OK, don't care enough about it at the moment and also I am not really good in C (only higher lvl languages). I also have linux for development, so I can use that. If for any reason I need to do a lot of dev work in windows (and regularly) I could well change my opinion, but not for now :)

Another question: is it possible that Git for Windows could provide an option to use https://de.wikipedia.org/wiki/Windows_Subsystem_for_Linux for executing shell scripts? May be much faster?

[dscho]

don't care enough about it

Well, that sends a clear message ;-)