git-gc.html

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 404 <div id="header">
 405 <h1>
 406 git-gc(1) Manual Page
 407 </h1>
 408 <h2>NAME</h2>
 409 <div class="sectionbody">
 410 <p>git-gc -
 411    Cleanup unnecessary files and optimize the local repository
 412 </p>
 413 </div>
 414 </div>
 415 <h2 id="_synopsis">SYNOPSIS</h2>
 416 <div class="sectionbody">
 417 <div class="paragraph"><p><em>git gc</em> [--aggressive] [--auto] [--quiet] [--prune=&lt;date&gt; | --no-prune]</p></div>
 418 </div>
 419 <h2 id="_description">DESCRIPTION</h2>
 420 <div class="sectionbody">
 421 <div class="paragraph"><p>Runs a number of housekeeping tasks within the current repository,
 422 such as compressing file revisions (to reduce disk space and increase
 423 performance) and removing unreachable objects which may have been
 424 created from prior invocations of <em>git add</em>.</p></div>
 425 <div class="paragraph"><p>Users are encouraged to run this task on a regular basis within
 426 each repository to maintain good disk space utilization and good
 427 operating performance.</p></div>
 428 <div class="paragraph"><p>Some git commands may automatically run <em>git gc</em>; see the <tt>--auto</tt> flag
 429 below for details. If you know what you&#8217;re doing and all you want is to
 430 disable this behavior permanently without further considerations, just do:</p></div>
 431 <div class="listingblock">
 432 <div class="content">
 433 <pre><tt>$ git config --global gc.auto 0</tt></pre>
 434 </div></div>
 435 </div>
 436 <h2 id="_options">OPTIONS</h2>
 437 <div class="sectionbody">
 438 <div class="dlist"><dl>
 439 <dt class="hdlist1">
 440 --aggressive
 441 </dt>
 442 <dd>
 443 <p>
 444         Usually <em>git gc</em> runs very quickly while providing good disk
 445         space utilization and performance.  This option will cause
 446         <em>git gc</em> to more aggressively optimize the repository at the expense
 447         of taking much more time.  The effects of this optimization are
 448         persistent, so this option only needs to be used occasionally; every
 449         few hundred changesets or so.
 450 </p>
 451 </dd>
 452 <dt class="hdlist1">
 453 --auto
 454 </dt>
 455 <dd>
 456 <p>
 457         With this option, <em>git gc</em> checks whether any housekeeping is
 458         required; if not, it exits without performing any work.
 459         Some git commands run <tt>git gc --auto</tt> after performing
 460         operations that could create many loose objects.
 461 </p>
 462 <div class="paragraph"><p>Housekeeping is required if there are too many loose objects or
 463 too many packs in the repository. If the number of loose objects
 464 exceeds the value of the <tt>gc.auto</tt> configuration variable, then
 465 all loose objects are combined into a single pack using
 466 <tt>git repack -d -l</tt>.  Setting the value of <tt>gc.auto</tt> to 0
 467 disables automatic packing of loose objects.</p></div>
 468 <div class="paragraph"><p>If the number of packs exceeds the value of <tt>gc.autopacklimit</tt>,
 469 then existing packs (except those marked with a <tt>.keep</tt> file)
 470 are consolidated into a single pack by using the <tt>-A</tt> option of
 471 <em>git repack</em>. Setting <tt>gc.autopacklimit</tt> to 0 disables
 472 automatic consolidation of packs.</p></div>
 473 </dd>
 474 <dt class="hdlist1">
 475 --prune=&lt;date&gt;
 476 </dt>
 477 <dd>
 478 <p>
 479         Prune loose objects older than date (default is 2 weeks ago,
 480         overridable by the config variable <tt>gc.pruneExpire</tt>).  This
 481         option is on by default.
 482 </p>
 483 </dd>
 484 <dt class="hdlist1">
 485 --no-prune
 486 </dt>
 487 <dd>
 488 <p>
 489         Do not prune any loose objects.
 490 </p>
 491 </dd>
 492 <dt class="hdlist1">
 493 --quiet
 494 </dt>
 495 <dd>
 496 <p>
 497         Suppress all progress reports.
 498 </p>
 499 </dd>
 500 </dl></div>
 501 </div>
 502 <h2 id="_configuration">Configuration</h2>
 503 <div class="sectionbody">
 504 <div class="paragraph"><p>The optional configuration variable <em>gc.reflogExpire</em> can be
 505 set to indicate how long historical entries within each branch&#8217;s
 506 reflog should remain available in this repository.  The setting is
 507 expressed as a length of time, for example <em>90 days</em> or <em>3 months</em>.
 508 It defaults to <em>90 days</em>.</p></div>
 509 <div class="paragraph"><p>The optional configuration variable <em>gc.reflogExpireUnreachable</em>
 510 can be set to indicate how long historical reflog entries which
 511 are not part of the current branch should remain available in
 512 this repository.  These types of entries are generally created as
 513 a result of using <tt>git commit --amend</tt> or <tt>git rebase</tt> and are the
 514 commits prior to the amend or rebase occurring.  Since these changes
 515 are not part of the current project most users will want to expire
 516 them sooner.  This option defaults to <em>30 days</em>.</p></div>
 517 <div class="paragraph"><p>The above two configuration variables can be given to a pattern.  For
 518 example, this sets non-default expiry values only to remote-tracking
 519 branches:</p></div>
 520 <div class="listingblock">
 521 <div class="content">
 522 <pre><tt>[gc "refs/remotes/*"]
 523         reflogExpire = never
 524         reflogexpireUnreachable = 3 days</tt></pre>
 525 </div></div>
 526 <div class="paragraph"><p>The optional configuration variable <em>gc.rerereresolved</em> indicates
 527 how long records of conflicted merge you resolved earlier are
 528 kept.  This defaults to 60 days.</p></div>
 529 <div class="paragraph"><p>The optional configuration variable <em>gc.rerereunresolved</em> indicates
 530 how long records of conflicted merge you have not resolved are
 531 kept.  This defaults to 15 days.</p></div>
 532 <div class="paragraph"><p>The optional configuration variable <em>gc.packrefs</em> determines if
 533 <em>git gc</em> runs <em>git pack-refs</em>. This can be set to "notbare" to enable
 534 it within all non-bare repos or it can be set to a boolean value.
 535 This defaults to true.</p></div>
 536 <div class="paragraph"><p>The optional configuration variable <em>gc.aggressiveWindow</em> controls how
 537 much time is spent optimizing the delta compression of the objects in
 538 the repository when the --aggressive option is specified.  The larger
 539 the value, the more time is spent optimizing the delta compression.  See
 540 the documentation for the --window' option in <a href="git-repack.html">git-repack(1)</a> for
 541 more details.  This defaults to 250.</p></div>
 542 <div class="paragraph"><p>The optional configuration variable <em>gc.pruneExpire</em> controls how old
 543 the unreferenced loose objects have to be before they are pruned.  The
 544 default is "2 weeks ago".</p></div>
 545 </div>
 546 <h2 id="_notes">Notes</h2>
 547 <div class="sectionbody">
 548 <div class="paragraph"><p><em>git gc</em> tries very hard to be safe about the garbage it collects. In
 549 particular, it will keep not only objects referenced by your current set
 550 of branches and tags, but also objects referenced by the index,
 551 remote-tracking branches, refs saved by <em>git filter-branch</em> in
 552 refs/original/, or reflogs (which may reference commits in branches
 553 that were later amended or rewound).</p></div>
 554 <div class="paragraph"><p>If you are expecting some objects to be collected and they aren&#8217;t, check
 555 all of those locations and decide whether it makes sense in your case to
 556 remove those references.</p></div>
 557 </div>
 558 <h2 id="_hooks">HOOKS</h2>
 559 <div class="sectionbody">
 560 <div class="paragraph"><p>The <em>git gc --auto</em> command will run the <em>pre-auto-gc</em> hook.  See
 561 <a href="githooks.html">githooks(5)</a> for more information.</p></div>
 562 </div>
 563 <h2 id="_see_also">SEE ALSO</h2>
 564 <div class="sectionbody">
 565 <div class="paragraph"><p><a href="git-prune.html">git-prune(1)</a>
 566 <a href="git-reflog.html">git-reflog(1)</a>
 567 <a href="git-repack.html">git-repack(1)</a>
 568 <a href="git-rerere.html">git-rerere(1)</a></p></div>
 569 </div>
 570 <h2 id="_git">GIT</h2>
 571 <div class="sectionbody">
 572 <div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
 573 </div>
 574 <div id="footer">
 575 <div id="footer-text">
 576 Last updated 2011-03-15 23:30:13 UTC
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