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571 <div id="header">
572 <h1>
573 git-gc(1) Manual Page
574 </h1>
575 <h2>NAME</h2>
576 <div class="sectionbody">
577 <p>git-gc -
578 Cleanup unnecessary files and optimize the local repository
579 </p>
580 </div>
581 </div>
582 <div id="content">
583 <h2 id="_synopsis">SYNOPSIS</h2>
584 <div class="sectionbody">
585 <div class="verseblock">
586 <div class="verseblock-content"><em>git gc</em> [--aggressive] [--auto] [--quiet] [--prune=&lt;date&gt; | --no-prune]</div>
587 <div class="verseblock-attribution">
588 </div></div>
589 </div>
590 <h2 id="_description">DESCRIPTION</h2>
591 <div class="sectionbody">
592 <div class="paragraph"><p>Runs a number of housekeeping tasks within the current repository,
593 such as compressing file revisions (to reduce disk space and increase
594 performance) and removing unreachable objects which may have been
595 created from prior invocations of <em>git add</em>.</p></div>
596 <div class="paragraph"><p>Users are encouraged to run this task on a regular basis within
597 each repository to maintain good disk space utilization and good
598 operating performance.</p></div>
599 <div class="paragraph"><p>Some git commands may automatically run <em>git gc</em>; see the <tt>--auto</tt> flag
600 below for details. If you know what you&#8217;re doing and all you want is to
601 disable this behavior permanently without further considerations, just do:</p></div>
602 <div class="listingblock">
603 <div class="content">
604 <pre><tt>$ git config --global gc.auto 0</tt></pre>
605 </div></div>
606 </div>
607 <h2 id="_options">OPTIONS</h2>
608 <div class="sectionbody">
609 <div class="dlist"><dl>
610 <dt class="hdlist1">
611 --aggressive
612 </dt>
613 <dd>
615 Usually <em>git gc</em> runs very quickly while providing good disk
616 space utilization and performance. This option will cause
617 <em>git gc</em> to more aggressively optimize the repository at the expense
618 of taking much more time. The effects of this optimization are
619 persistent, so this option only needs to be used occasionally; every
620 few hundred changesets or so.
621 </p>
622 </dd>
623 <dt class="hdlist1">
624 --auto
625 </dt>
626 <dd>
628 With this option, <em>git gc</em> checks whether any housekeeping is
629 required; if not, it exits without performing any work.
630 Some git commands run <tt>git gc --auto</tt> after performing
631 operations that could create many loose objects.
632 </p>
633 <div class="paragraph"><p>Housekeeping is required if there are too many loose objects or
634 too many packs in the repository. If the number of loose objects
635 exceeds the value of the <tt>gc.auto</tt> configuration variable, then
636 all loose objects are combined into a single pack using
637 <tt>git repack -d -l</tt>. Setting the value of <tt>gc.auto</tt> to 0
638 disables automatic packing of loose objects.</p></div>
639 <div class="paragraph"><p>If the number of packs exceeds the value of <tt>gc.autopacklimit</tt>,
640 then existing packs (except those marked with a <tt>.keep</tt> file)
641 are consolidated into a single pack by using the <tt>-A</tt> option of
642 <em>git repack</em>. Setting <tt>gc.autopacklimit</tt> to 0 disables
643 automatic consolidation of packs.</p></div>
644 </dd>
645 <dt class="hdlist1">
646 --prune=&lt;date&gt;
647 </dt>
648 <dd>
650 Prune loose objects older than date (default is 2 weeks ago,
651 overridable by the config variable <tt>gc.pruneExpire</tt>). This
652 option is on by default.
653 </p>
654 </dd>
655 <dt class="hdlist1">
656 --no-prune
657 </dt>
658 <dd>
660 Do not prune any loose objects.
661 </p>
662 </dd>
663 <dt class="hdlist1">
664 --quiet
665 </dt>
666 <dd>
668 Suppress all progress reports.
669 </p>
670 </dd>
671 </dl></div>
672 </div>
673 <h2 id="_configuration">Configuration</h2>
674 <div class="sectionbody">
675 <div class="paragraph"><p>The optional configuration variable <em>gc.reflogExpire</em> can be
676 set to indicate how long historical entries within each branch&#8217;s
677 reflog should remain available in this repository. The setting is
678 expressed as a length of time, for example <em>90 days</em> or <em>3 months</em>.
679 It defaults to <em>90 days</em>.</p></div>
680 <div class="paragraph"><p>The optional configuration variable <em>gc.reflogExpireUnreachable</em>
681 can be set to indicate how long historical reflog entries which
682 are not part of the current branch should remain available in
683 this repository. These types of entries are generally created as
684 a result of using <tt>git commit --amend</tt> or <tt>git rebase</tt> and are the
685 commits prior to the amend or rebase occurring. Since these changes
686 are not part of the current project most users will want to expire
687 them sooner. This option defaults to <em>30 days</em>.</p></div>
688 <div class="paragraph"><p>The above two configuration variables can be given to a pattern. For
689 example, this sets non-default expiry values only to remote-tracking
690 branches:</p></div>
691 <div class="listingblock">
692 <div class="content">
693 <pre><tt>[gc "refs/remotes/*"]
694 reflogExpire = never
695 reflogexpireUnreachable = 3 days</tt></pre>
696 </div></div>
697 <div class="paragraph"><p>The optional configuration variable <em>gc.rerereresolved</em> indicates
698 how long records of conflicted merge you resolved earlier are
699 kept. This defaults to 60 days.</p></div>
700 <div class="paragraph"><p>The optional configuration variable <em>gc.rerereunresolved</em> indicates
701 how long records of conflicted merge you have not resolved are
702 kept. This defaults to 15 days.</p></div>
703 <div class="paragraph"><p>The optional configuration variable <em>gc.packrefs</em> determines if
704 <em>git gc</em> runs <em>git pack-refs</em>. This can be set to "notbare" to enable
705 it within all non-bare repos or it can be set to a boolean value.
706 This defaults to true.</p></div>
707 <div class="paragraph"><p>The optional configuration variable <em>gc.aggressiveWindow</em> controls how
708 much time is spent optimizing the delta compression of the objects in
709 the repository when the --aggressive option is specified. The larger
710 the value, the more time is spent optimizing the delta compression. See
711 the documentation for the --window' option in <a href="git-repack.html">git-repack(1)</a> for
712 more details. This defaults to 250.</p></div>
713 <div class="paragraph"><p>The optional configuration variable <em>gc.pruneExpire</em> controls how old
714 the unreferenced loose objects have to be before they are pruned. The
715 default is "2 weeks ago".</p></div>
716 </div>
717 <h2 id="_notes">Notes</h2>
718 <div class="sectionbody">
719 <div class="paragraph"><p><em>git gc</em> tries very hard to be safe about the garbage it collects. In
720 particular, it will keep not only objects referenced by your current set
721 of branches and tags, but also objects referenced by the index,
722 remote-tracking branches, refs saved by <em>git filter-branch</em> in
723 refs/original/, or reflogs (which may reference commits in branches
724 that were later amended or rewound).</p></div>
725 <div class="paragraph"><p>If you are expecting some objects to be collected and they aren&#8217;t, check
726 all of those locations and decide whether it makes sense in your case to
727 remove those references.</p></div>
728 </div>
729 <h2 id="_hooks">HOOKS</h2>
730 <div class="sectionbody">
731 <div class="paragraph"><p>The <em>git gc --auto</em> command will run the <em>pre-auto-gc</em> hook. See
732 <a href="githooks.html">githooks(5)</a> for more information.</p></div>
733 </div>
734 <h2 id="_see_also">SEE ALSO</h2>
735 <div class="sectionbody">
736 <div class="paragraph"><p><a href="git-prune.html">git-prune(1)</a>
737 <a href="git-reflog.html">git-reflog(1)</a>
738 <a href="git-repack.html">git-repack(1)</a>
739 <a href="git-rerere.html">git-rerere(1)</a></p></div>
740 </div>
741 <h2 id="_git">GIT</h2>
742 <div class="sectionbody">
743 <div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
744 </div>
745 </div>
746 <div id="footnotes"><hr /></div>
747 <div id="footer">
748 <div id="footer-text">
749 Last updated 2011-09-21 23:01:14 PDT
750 </div>
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