Dale Worley於 2014年12月27日星期六UTC+8上午4時37分08秒寫道：
> > I have a git repository, which master is empty and a branch contains
> > android 5.0.0_r1. (Yes, I packed all android git repository into one).
> > Now I want to push android 5.0.2_r1 into the repository. I checkout the
> > master git an empty work place. Then create a new branch called
> > android_5.0.2_r1, put all file in it, add all file then commit.
> > I found I have got a twice large size repository. This means even most
> > files are the same, git still store them as a new object. Just wonder
> If two files contain *exactly* the same content, then they will be
> stored as one blob. My guess is that most or all of the files are not
> exactly the same in the two versions of Android. You can check this
> with a command like "git diff branch1 branch2".
> Eventually, even if the files are slightly different, they will be put
> into pack files. Within pack files, the compression system will detect
> that the files are mostly the same and remove much of the duplicate
I am pretty sure most of the files are the same by git diff.
There is only small parts of the code base differ.
Just like you said, I expect only slight size increase with the new
However, the repository doubled the size from 4G to 8G. Just as twice as
the original size.
> > There are still some other questions. I already push the new branch to
> > Gerrit server. When I found the repository size doubled, I just delete
> > beanch from WebUI. Still the repository remains its size even I run git
> > How can I remove the branch and its commit completely?
> git-gc doesn't remove information that has been added "recently", so
> that it can be recovered from the reflogs. Look at the option
> Prune loose objects older than date (default is 2 weeks ago,
> overridable by the config variable gc.pruneExpire). This option
> on by default.
> and also the configuration options:
> logallrefupdates = false
> pruneexpire = now
Thanks. I will try to clean up my repository using these suggestions.
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