5c47e1c7c5
In 479b56ba ('make "repack -f" imply "pack-objects --no-reuse-object"'),
git repack -f was changed to include recompressing all objects on the
zlib level on the assumption that if the user wants to spend that much
time already, some more time won't hurt (and recompressing is useful if
the user changed the zlib compression level).
However, "some more time" can be quite long with very big repositories,
so some users are going to appreciate being able to choose. If we are
going to give them the choice, --no-reuse-object will probably be
interesting a lot less frequently than --no-reuse-delta. Hence, this
reverts -f to the old behaviour (--no-reuse-delta) and adds a new -F
option that replaces the current -f.
Measurements taken using this patch on a current clone of git.git
indicate a 17% decrease in time being made available to users:
git repack -Adf 34.84s user 0.56s system 145% cpu 24.388 total
git repack -AdF 38.79s user 0.56s system 133% cpu 29.394 total
Signed-off-by: Jan Krüger <jk@jk.gs>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
143 lines
4.6 KiB
Plaintext
143 lines
4.6 KiB
Plaintext
git-repack(1)
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=============
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NAME
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----
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git-repack - Pack unpacked objects in a repository
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SYNOPSIS
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--------
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'git repack' [-a] [-A] [-d] [-f] [-F] [-l] [-n] [-q] [--window=N] [--depth=N]
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DESCRIPTION
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-----------
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This script is used to combine all objects that do not currently
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reside in a "pack", into a pack. It can also be used to re-organize
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existing packs into a single, more efficient pack.
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A pack is a collection of objects, individually compressed, with
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delta compression applied, stored in a single file, with an
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associated index file.
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Packs are used to reduce the load on mirror systems, backup
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engines, disk storage, etc.
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OPTIONS
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-------
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-a::
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Instead of incrementally packing the unpacked objects,
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pack everything referenced into a single pack.
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Especially useful when packing a repository that is used
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for private development. Use
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with '-d'. This will clean up the objects that `git prune`
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leaves behind, but `git fsck --full` shows as
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dangling.
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+
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Note that users fetching over dumb protocols will have to fetch the
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whole new pack in order to get any contained object, no matter how many
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other objects in that pack they already have locally.
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-A::
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Same as `-a`, unless '-d' is used. Then any unreachable
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objects in a previous pack become loose, unpacked objects,
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instead of being left in the old pack. Unreachable objects
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are never intentionally added to a pack, even when repacking.
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This option prevents unreachable objects from being immediately
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deleted by way of being left in the old pack and then
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removed. Instead, the loose unreachable objects
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will be pruned according to normal expiry rules
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with the next 'git gc' invocation. See linkgit:git-gc[1].
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-d::
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After packing, if the newly created packs make some
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existing packs redundant, remove the redundant packs.
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Also run 'git prune-packed' to remove redundant
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loose object files.
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-l::
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Pass the `--local` option to 'git pack-objects'. See
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linkgit:git-pack-objects[1].
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-f::
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Pass the `--no-reuse-delta` option to `git-pack-objects`, see
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linkgit:git-pack-objects[1].
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-F::
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Pass the `--no-reuse-object` option to `git-pack-objects`, see
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linkgit:git-pack-objects[1].
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-q::
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Pass the `-q` option to 'git pack-objects'. See
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linkgit:git-pack-objects[1].
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-n::
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Do not update the server information with
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'git update-server-info'. This option skips
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updating local catalog files needed to publish
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this repository (or a direct copy of it)
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over HTTP or FTP. See linkgit:git-update-server-info[1].
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--window=[N]::
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--depth=[N]::
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These two options affect how the objects contained in the pack are
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stored using delta compression. The objects are first internally
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sorted by type, size and optionally names and compared against the
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other objects within `--window` to see if using delta compression saves
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space. `--depth` limits the maximum delta depth; making it too deep
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affects the performance on the unpacker side, because delta data needs
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to be applied that many times to get to the necessary object.
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The default value for --window is 10 and --depth is 50.
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--window-memory=[N]::
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This option provides an additional limit on top of `--window`;
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the window size will dynamically scale down so as to not take
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up more than N bytes in memory. This is useful in
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repositories with a mix of large and small objects to not run
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out of memory with a large window, but still be able to take
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advantage of the large window for the smaller objects. The
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size can be suffixed with "k", "m", or "g".
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`--window-memory=0` makes memory usage unlimited, which is the
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default.
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--max-pack-size=[N]::
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Maximum size of each output pack file. The size can be suffixed with
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"k", "m", or "g". The minimum size allowed is limited to 1 MiB.
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If specified, multiple packfiles may be created.
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The default is unlimited, unless the config variable
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`pack.packSizeLimit` is set.
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Configuration
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-------------
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By default, the command passes `--delta-base-offset` option to
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'git pack-objects'; this typically results in slightly smaller packs,
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but the generated packs are incompatible with versions of Git older than
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version 1.4.4. If you need to share your repository with such ancient Git
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versions, either directly or via the dumb http or rsync protocol, then you
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need to set the configuration variable `repack.UseDeltaBaseOffset` to
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"false" and repack. Access from old Git versions over the native protocol
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is unaffected by this option as the conversion is performed on the fly
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as needed in that case.
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Author
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------
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Written by Linus Torvalds <torvalds@osdl.org>
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Documentation
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--------------
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Documentation by Ryan Anderson <ryan@michonline.com>
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SEE ALSO
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--------
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linkgit:git-pack-objects[1]
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linkgit:git-prune-packed[1]
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GIT
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---
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Part of the linkgit:git[1] suite
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