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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] [--keep-largest-pack]</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), removing unreachable objects which may have been
created from prior invocations of <em>git add</em>, packing refs, pruning
reflog, rerere metadata or stale working trees. May also update ancillary
indexes such as the commit-graph.</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. Housekeeping
        is required if there are too many loose objects or too many
        packs in the repository.
</p>
<div class="paragraph"><p>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
or over <code>gc.bigPackThreshold</code> limit)
are consolidated into a single pack by using the <code>-A</code> option of
<em>git repack</em>.
If the amount of memory is estimated not enough for <code>git repack</code> to
run smoothly and <code>gc.bigPackThreshold</code> is not set, the largest
pack will also be excluded (this is the equivalent of running <code>git gc</code>
with <code>--keep-base-pack</code>).
Setting <code>gc.autoPackLimit</code> to 0 disables automatic consolidation of
packs.</p></div>
<div class="paragraph"><p>If houskeeping is required due to many loose objects or packs, all
other housekeeping tasks (e.g. rerere, working trees, reflog&#8230;) will
be performed as well.</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 and
        increases the risk of corruption if another process is writing to
        the repository concurrently; see "NOTES" below. --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>
<dt class="hdlist1">
--keep-largest-pack
</dt>
<dd>
<p>
        All packs except the largest pack and those marked with a
        <code>.keep</code> files are consolidated into a single pack. When this
        option is used, <code>gc.bigPackThreshold</code> is ignored.
</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 <code>gc.writeCommitGraph</code> determines if
<em>git gc</em> should run <em>git commit-graph write</em>. This can be set to a
boolean value. This defaults to false.</p></div>
<div class="paragraph"><p>The optional configuration variable <code>gc.aggressiveWindow</code> 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 <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 50.</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 class="paragraph"><p>Optional configuration variable <code>gc.worktreePruneExpire</code> controls how
old a stale working tree should be before <code>git worktree prune</code> deletes
it. Default is "3 months 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 not to delete objects that are referenced
anywhere in your repository. 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).
If you are expecting some objects to be deleted 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 class="paragraph"><p>On the other hand, when <em>git gc</em> runs concurrently with another process,
there is a risk of it deleting an object that the other process is using
but hasn&#8217;t created a reference to. This may just cause the other process
to fail or may corrupt the repository if the other process later adds a
reference to the deleted object. Git has two features that significantly
mitigate this problem:</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
Any object with modification time newer than the <code>--prune</code> date is kept,
  along with everything reachable from it.
</p>
</li>
<li>
<p>
Most operations that add an object to the database update the
  modification time of the object if it is already present so that #1
  applies.
</p>
</li>
</ol></div>
<div class="paragraph"><p>However, these features fall short of a complete solution, so users who
run commands concurrently have to live with some risk of corruption (which
seems to be low in practice) unless they turn off automatic garbage
collection with <em>git config gc.auto 0</em>.</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
 2019-01-18 15:15:21 PST
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