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The --batch-size=<size> option of 'git multi-pack-index repack' is intended to limit the amount of work done by the repack. In the case of a large repository, this command should repack a number of small pack-files but leave the large pack-files alone. Most often, the repository has one large pack-file from a 'git clone' operation and number of smaller pack-files from incremental 'git fetch' operations. The issue with '--batch-size' is that it also _prevents_ the repack from happening if the expected size of the resulting pack-file is too small. This was intended as a way to avoid frequent churn of small pack-files, but it has mostly caused confusion when a repository is of "medium" size. That is, not enormous like the Windows OS repository, but also not so small that this incremental repack isn't valuable. The solution presented here is to collect pack-files for repack if their expected size is smaller than the batch-size parameter until either the total expected size exceeds the batch-size or all pack-files are considered. If there are at least two pack-files, then these are combined to a new pack-file whose size should not be too much larger than the batch-size. This new strategy should succeed in keeping the number of pack-files small in these "medium" size repositories. The concern about churn is likely not interesting, as the real control over that is the frequency in which the repack command is run. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Reviewed-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
96 lines
2.9 KiB
Text
96 lines
2.9 KiB
Text
git-multi-pack-index(1)
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=======================
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NAME
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----
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git-multi-pack-index - Write and verify multi-pack-indexes
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SYNOPSIS
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--------
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[verse]
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'git multi-pack-index' [--object-dir=<dir>] [--[no-]progress] <subcommand>
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DESCRIPTION
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-----------
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Write or verify a multi-pack-index (MIDX) file.
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OPTIONS
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-------
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--object-dir=<dir>::
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Use given directory for the location of Git objects. We check
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`<dir>/packs/multi-pack-index` for the current MIDX file, and
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`<dir>/packs` for the pack-files to index.
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--[no-]progress::
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Turn progress on/off explicitly. If neither is specified, progress is
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shown if standard error is connected to a terminal.
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The following subcommands are available:
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write::
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Write a new MIDX file.
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verify::
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Verify the contents of the MIDX file.
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expire::
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Delete the pack-files that are tracked by the MIDX file, but
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have no objects referenced by the MIDX. Rewrite the MIDX file
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afterward to remove all references to these pack-files.
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repack::
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Create a new pack-file containing objects in small pack-files
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referenced by the multi-pack-index. If the size given by the
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`--batch-size=<size>` argument is zero, then create a pack
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containing all objects referenced by the multi-pack-index. For
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a non-zero batch size, Select the pack-files by examining packs
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from oldest-to-newest, computing the "expected size" by counting
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the number of objects in the pack referenced by the
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multi-pack-index, then divide by the total number of objects in
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the pack and multiply by the pack size. We select packs with
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expected size below the batch size until the set of packs have
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total expected size at least the batch size, or all pack-files
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are considered. If only one pack-file is selected, then do
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nothing. If a new pack-file is created, rewrite the
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multi-pack-index to reference the new pack-file. A later run of
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'git multi-pack-index expire' will delete the pack-files that
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were part of this batch.
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+
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If `repack.packKeptObjects` is `false`, then any pack-files with an
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associated `.keep` file will not be selected for the batch to repack.
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EXAMPLES
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--------
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* Write a MIDX file for the packfiles in the current .git folder.
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+
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-----------------------------------------------
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$ git multi-pack-index write
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-----------------------------------------------
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* Write a MIDX file for the packfiles in an alternate object store.
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+
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-----------------------------------------------
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$ git multi-pack-index --object-dir <alt> write
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-----------------------------------------------
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* Verify the MIDX file for the packfiles in the current .git folder.
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+
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-----------------------------------------------
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$ git multi-pack-index verify
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-----------------------------------------------
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SEE ALSO
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--------
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See link:technical/multi-pack-index.html[The Multi-Pack-Index Design
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Document] and link:technical/pack-format.html[The Multi-Pack-Index
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Format] for more information on the multi-pack-index feature.
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GIT
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---
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Part of the linkgit:git[1] suite
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