Hi, Dale,
I do some experiments on Linux kernel.
1. Download 3.17.7 and 3.18.1 from kernel.org
commit the source into branch 3.17.7 and 3.18.1 which branched from an
empty master branch.
2. git ls-tree --full-tree -r -l both branch.
The result shows if the two file content is the same. The blob hash is
the same.
The same file won't occupy extra space.
I will check what's wrong with my android upgrade. Thanks for the help.
Dale Worley於 2014年12月29日星期一UTC+8上午4時14分18秒寫道：
>
> <dcg...@gmail.com <javascript:>> writes:
> > I am pretty sure most of the files are the same by git diff.
>
> Does that mean that you have actually done a git-diff and examined the
> total size of the files whose content has changed?
>
> > There is only small parts of the code base differ.
> >
> > Just like you said, I expect only slight size increase with the new
> > branch pushed.
> > However, the repository doubled the size from 4G to 8G. Just as twice
> as
> > the original size.
>
> Have you actually enumerated where the space is being consumed?
>
> One way is to execute "git ls-tree --full-tree -r -l [branch]" for each
> branch, then use "comm" to find the lines for new/different files in the
> second branch. Total the 4th fields of those lines and see how much
> space they occupy (uncompressed).
>
> Dale
>
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