git-gc.html - external/gitster/git-htmldocs - Git at Google

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 <body class="manpage">
 <div id="header">
 <h1>
 git-gc(1) Manual Page
 </h1>
 <h2>NAME</h2>
 <div class="sectionbody">
 <p>git-gc -
    Cleanup unnecessary files and optimize the local repository
 </p>
 </div>
 </div>
 <div id="content">
 <div class="sect1">
 <h2 id="_synopsis">SYNOPSIS</h2>
 <div class="sectionbody">
 <div class="verseblock">
 <pre class="content"><em>git gc</em> [--aggressive] [--auto] [--quiet] [--prune=&lt;date&gt; | --no-prune] [--force]</pre>
 <div class="attribution">
 </div></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_description">DESCRIPTION</h2>
 <div class="sectionbody">
 <div class="paragraph"><p>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 <em>git add</em>.</p></div>
 <div class="paragraph"><p>Users are encouraged to run this task on a regular basis within
 each repository to maintain good disk space utilization and good
 operating performance.</p></div>
 <div class="paragraph"><p>Some git commands may automatically run <em>git gc</em>; see the <code>--auto</code> 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:</p></div>
 <div class="listingblock">
 <div class="content">
 <pre><code>$ git config --global gc.auto 0</code></pre>
 </div></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_options">OPTIONS</h2>
 <div class="sectionbody">
 <div class="dlist"><dl>
 <dt class="hdlist1">
 --aggressive
 </dt>
 <dd>
 <p>
         Usually <em>git gc</em> runs very quickly while providing good disk
         space utilization and performance.  This option will cause
         <em>git gc</em> 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.
 </p>
 </dd>
 <dt class="hdlist1">
 --auto
 </dt>
 <dd>
 <p>
         With this option, <em>git gc</em> checks whether any housekeeping is
         required; if not, it exits without performing any work.
         Some git commands run <code>git gc --auto</code> after performing
         operations that could create many loose objects.
 </p>
 <div class="paragraph"><p>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 <code>gc.auto</code> configuration variable, then
 all loose objects are combined into a single pack using
 <code>git repack -d -l</code>.  Setting the value of <code>gc.auto</code> to 0
 disables automatic packing of loose objects.</p></div>
 <div class="paragraph"><p>If the number of packs exceeds the value of <code>gc.autoPackLimit</code>,
 then existing packs (except those marked with a <code>.keep</code> file)
 are consolidated into a single pack by using the <code>-A</code> option of
 <em>git repack</em>. Setting <code>gc.autoPackLimit</code> to 0 disables
 automatic consolidation of packs.</p></div>
 </dd>
 <dt class="hdlist1">
 --prune=&lt;date&gt;
 </dt>
 <dd>
 <p>
         Prune loose objects older than date (default is 2 weeks ago,
         overridable by the config variable <code>gc.pruneExpire</code>).
         --prune=all prunes loose objects regardless of their age (do
         not use --prune=all unless you know exactly what you are doing.
         Unless the repository is quiescent, you will lose newly created
         objects that haven&#8217;t been anchored with the refs and end up
         corrupting your repository).  --prune is on by default.
 </p>
 </dd>
 <dt class="hdlist1">
 --no-prune
 </dt>
 <dd>
 <p>
         Do not prune any loose objects.
 </p>
 </dd>
 <dt class="hdlist1">
 --quiet
 </dt>
 <dd>
 <p>
         Suppress all progress reports.
 </p>
 </dd>
 <dt class="hdlist1">
 --force
 </dt>
 <dd>
 <p>
         Force <code>git gc</code> to run even if there may be another <code>git gc</code>
         instance running on this repository.
 </p>
 </dd>
 </dl></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_configuration">Configuration</h2>
 <div class="sectionbody">
 <div class="paragraph"><p>The optional configuration variable <code>gc.reflogExpire</code> 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 <em>90 days</em> or <em>3 months</em>.
 It defaults to <em>90 days</em>.</p></div>
 <div class="paragraph"><p>The optional configuration variable <code>gc.reflogExpireUnreachable</code>
 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 <code>git commit --amend</code> or <code>git rebase</code> 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 <em>30 days</em>.</p></div>
 <div class="paragraph"><p>The above two configuration variables can be given to a pattern.  For
 example, this sets non-default expiry values only to remote-tracking
 branches:</p></div>
 <div class="listingblock">
 <div class="content">
 <pre><code>[gc "refs/remotes/*"]
         reflogExpire = never
         reflogExpireUnreachable = 3 days</code></pre>
 </div></div>
 <div class="paragraph"><p>The optional configuration variable <code>gc.rerereResolved</code> indicates
 how long records of conflicted merge you resolved earlier are
 kept.  This defaults to 60 days.</p></div>
 <div class="paragraph"><p>The optional configuration variable <code>gc.rerereUnresolved</code> indicates
 how long records of conflicted merge you have not resolved are
 kept.  This defaults to 15 days.</p></div>
 <div class="paragraph"><p>The optional configuration variable <code>gc.packRefs</code> determines if
 <em>git gc</em> runs <em>git pack-refs</em>. 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.</p></div>
 <div class="paragraph"><p>The optional configuration variable &#8216;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&#8217; option in <a href="git-repack.html">git-repack(1)</a> for
 more details.  This defaults to 250.</p></div>
 <div class="paragraph"><p>Similarly, the optional configuration variable <code>gc.aggressiveDepth</code>
 controls --depth option in <a href="git-repack.html">git-repack(1)</a>. This defaults to 250.</p></div>
 <div class="paragraph"><p>The optional configuration variable <code>gc.pruneExpire</code> controls how old
 the unreferenced loose objects have to be before they are pruned.  The
 default is "2 weeks ago".</p></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_notes">Notes</h2>
 <div class="sectionbody">
 <div class="paragraph"><p><em>git gc</em> 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 <em>git filter-branch</em> in
 refs/original/, or reflogs (which may reference commits in branches
 that were later amended or rewound).</p></div>
 <div class="paragraph"><p>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.</p></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_hooks">HOOKS</h2>
 <div class="sectionbody">
 <div class="paragraph"><p>The <em>git gc --auto</em> command will run the <em>pre-auto-gc</em> hook.  See
 <a href="githooks.html">githooks(5)</a> for more information.</p></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_see_also">SEE ALSO</h2>
 <div class="sectionbody">
 <div class="paragraph"><p><a href="git-prune.html">git-prune(1)</a>
 <a href="git-reflog.html">git-reflog(1)</a>
 <a href="git-repack.html">git-repack(1)</a>
 <a href="git-rerere.html">git-rerere(1)</a></p></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_git">GIT</h2>
 <div class="sectionbody">
 <div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
 </div>
 </div>
 </div>
 <div id="footnotes"><hr /></div>
 <div id="footer">
 <div id="footer-text">
 Last updated 2016-06-27 11:04:05 PDT
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