GIT-GC(1) Git Manual GIT-GC(1)
git-gc - Cleanup unnecessary files and optimize the local repository
git gc [--aggressive] [--auto] [--quiet] [--prune=<date> | --no-prune]
Runs a number of housekeeping tasks within the current repository, such as compressing file revisions (to reduce disk space and increase
performance) and removing unreachable objects which may have been created from prior invocations of git add.
Users are encouraged to run this task on a regular basis within each repository to maintain good disk space utilization and good operating
Some git commands may automatically run git gc; see the --auto flag below for details. If you know what you're doing and all you want is to
disable this behavior permanently without further considerations, just do:
$ git config --global gc.auto 0
Usually git gc runs very quickly while providing good disk space utilization and performance. This option will cause git gc to more
aggressively optimize the repository at the expense of taking much more time. The effects of this optimization are persistent, so this
option only needs to be used occasionally; every few hundred changesets or so.
With this option, git gc checks whether any housekeeping is required; if not, it exits without performing any work. Some git commands
run git gc --auto after performing operations that could create many loose objects.
Housekeeping is required if there are too many loose objects or too many packs in the repository. If the number of loose objects
exceeds the value of the gc.auto configuration variable, then all loose objects are combined into a single pack using git repack -d -l.
Setting the value of gc.auto to 0 disables automatic packing of loose objects.
If the number of packs exceeds the value of gc.autopacklimit, then existing packs (except those marked with a .keep file) are
consolidated into a single pack by using the -A option of git repack. Setting gc.autopacklimit to 0 disables automatic consolidation of
Prune loose objects older than date (default is 2 weeks ago, overridable by the config variable gc.pruneExpire). This option is on by
Do not prune any loose objects.
Suppress all progress reports.
The optional configuration variable gc.reflogExpire can be set to indicate how long historical entries within each branch's reflog should
remain available in this repository. The setting is expressed as a length of time, for example 90 days or 3 months. It defaults to 90 days.
The optional configuration variable gc.reflogExpireUnreachable can be set to indicate how long historical reflog entries which are not part
of the current branch should remain available in this repository. These types of entries are generally created as a result of using git
commit --amend or git rebase and are the commits prior to the amend or rebase occurring. Since these changes are not part of the current
project most users will want to expire them sooner. This option defaults to 30 days.
The above two configuration variables can be given to a pattern. For example, this sets non-default expiry values only to remote-tracking
reflogExpire = never
reflogexpireUnreachable = 3 days
The optional configuration variable gc.rerereresolved indicates how long records of conflicted merge you resolved earlier are kept. This
defaults to 60 days.
The optional configuration variable gc.rerereunresolved indicates how long records of conflicted merge you have not resolved are kept. This
defaults to 15 days.
The optional configuration variable gc.packrefs determines if git gc runs git pack-refs. This can be set to "notbare" to enable it within
all non-bare repos or it can be set to a boolean value. This defaults to true.
The optional configuration variable gc.aggressiveWindow controls how much time is spent optimizing the delta compression of the objects in
the repository when the --aggressive option is specified. The larger the value, the more time is spent optimizing the delta compression.
See the documentation for the --window' option in git-repack(1) for more details. This defaults to 250.
The optional configuration variable gc.pruneExpire controls how old the unreferenced loose objects have to be before they are pruned. The
default is "2 weeks ago".
git gc tries very hard to be safe about the garbage it collects. In particular, it will keep not only objects referenced by your current
set of branches and tags, but also objects referenced by the index, remote-tracking branches, refs saved by git filter-branch in
refs/original/, or reflogs (which may reference commits in branches that were later amended or rewound).
If you are expecting some objects to be collected and they aren't, check all of those locations and decide whether it makes sense in your
case to remove those references.
The git gc --auto command will run the pre-auto-gc hook. See githooks(5) for more information.
git-prune(1) git-reflog(1) git-repack(1) git-rerere(1)
Part of the git(1) suite
Git 220.127.116.11 06/10/2014 GIT-GC(1)