2009/5/7 Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>:
>
> Somebody should check. It would be interesting to hear about whether this
> makes a performance impact, especially with slow filesystems and/or other
> operating systems that have a relatively higher cost for 'lstat()'.
>
I did (cygwin). My guess, the improvement is completely dwarfed by the
other overheads (like starting git and writing files).
# Without the patch
real 11m22.338s
user 0m54.629s
sys 8m33.638s
# With checkout index preload
real 11m14.361s
user 0m46.609s
sys 7m56.300s
The script:
#!/bin/sh
if [ "$1" = setup ]; then
for i in 1 2 3 4
do
n=$(date)
for f in `seq 1 10000`
do
echo "$n" >file$f
done
git add .
printf "Commit $i:"
git commit -m"$n"
done
exit
fi
export GIT_EXEC_PATH=/d/git-win
time for f in `seq 1 10`
do
$GIT_EXEC_PATH/git checkout master~3 &&
$GIT_EXEC_PATH/git checkout master~2 &&
$GIT_EXEC_PATH/git checkout master~1 &&
$GIT_EXEC_PATH/git checkout master
done
exit
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