GIT-GC(1)                                                            GIT-GC(1)



NAME
       git-gc - Cleanup unnecessary files and optimize the local repository

SYNOPSIS
       git gc [--aggressive] [--auto] [--quiet] [--prune=<date> | --no-prune]


DESCRIPTION
       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
       performance.


       Some git commands may automatically run git gc; see the --auto flag
       below for details. If you know what you&#8217;re doing and all you want
       is to disable this behavior permanently without further considerations,
       just do:

       $ git config --global gc.auto 0





OPTIONS
       --aggressive
              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.


       --auto 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 packs.


       --prune=<date>
              Prune loose objects older than date (default is 2 weeks ago,
              overridable by the config variable gc.pruneExpire). This option
              is on by default.


       --no-prune
              Do not prune any loose objects.


       --quiet
              Suppress all progress reports.


CONFIGURATION
       The optional configuration variable gc.reflogExpire can be set to
       indicate how long historical entries within each branch&#8217;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
       branches:

       [gc "refs/remotes/*"]
               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".


NOTES
       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&#8217;t, check all of those locations and decide whether it makes
       sense in your case to remove those references.


HOOKS
       The git gc --auto command will run the pre-auto-gc hook. See
       githooks(5) for more information.


SEE ALSO
       git-prune(1) git-reflog(1) git-repack(1) git-rerere(1)


GIT
       Part of the git(1) suite




                                                                     GIT-GC(1)
