GIT-GC(1)                                                  Git Manual                                                  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'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'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'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)

AUTHOR
       Written by Shawn O. Pearce <spearceATspearce.org[1]>

GIT
       Part of the git(1) suite

NOTES
        1. spearceATspearce.org
           mailto:spearceATspearce.org



Git 1.7.4.4                                                04/11/2011                                                  GIT-GC(1)