Re: Stats in Git

Marius Storm-Olsen [off-list ref] writes:

However, while look at that whole stat'ing situation in git, I saw
that doing 'git status' actually stats all the files _thrice_!
Yup, that's not 1 time, or 2 times, but actually 3(!) times before
'git status' is content!

My experiments show 2 stats only:

$ strace -f git status |& grep -e execve -e  foo                  
[...]
[pid 22492] execve("/home/moy/local/usr//bin/git", ["git", "update-index", "-q", "--unmerged", "--refresh"], [/* 50 vars */]) = 0
[pid 22492] lstat64("foo", {st_mode=S_IFREG|0755, st_size=0, ...}) = 0
[pid 22493] execve("/home/moy/local/usr//bin/git", ["git", "runstatus"], [/* 49 vars */]) = 0
[pid 22493] lstat64("foo", {st_mode=S_IFREG|0755, st_size=0, ...}) = 0
[...]

Once for "git update-index --refresh" and once more for "git
runstatus". Obviously, a builtin with one tree traversal only would
provide a good speedup.

-- 
Matthieu