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git/Documentation/config/feature.txt
Taylor Blau 23c1e71369 pack-objects: enable multi-pack reuse via `feature.experimental`
Now that multi-pack reuse is supported, enable it via the
feature.experimental configuration in addition to the classic
`pack.allowPackReuse`.

This will allow more users to experiment with the new behavior who might
not otherwise be aware of the existing `pack.allowPackReuse`
configuration option.

The enum with values NO_PACK_REUSE, SINGLE_PACK_REUSE, and
MULTI_PACK_REUSE is defined statically in builtin/pack-objects.c's
compilation unit. We could hoist that enum into a scope visible from the
repository_settings struct, and then use that enum value in
pack-objects. Instead, define a single int that indicates what
pack-objects's default value should be to avoid additional unnecessary
code movement.

Though `feature.experimental` implies `pack.allowPackReuse=multi`, this
can still be overridden by explicitly setting the latter configuration
to either "single" or "false". Tests covering all of these cases are
showin t5332.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2024-02-05 15:27:01 -08:00

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feature.*::
The config settings that start with `feature.` modify the defaults of
a group of other config settings. These groups are created by the Git
developer community as recommended defaults and are subject to change.
In particular, new config options may be added with different defaults.
feature.experimental::
Enable config options that are new to Git, and are being considered for
future defaults. Config settings included here may be added or removed
with each release, including minor version updates. These settings may
have unintended interactions since they are so new. Please enable this
setting if you are interested in providing feedback on experimental
features. The new default values are:
+
* `fetch.negotiationAlgorithm=skipping` may improve fetch negotiation times by
skipping more commits at a time, reducing the number of round trips.
+
* `pack.useBitmapBoundaryTraversal=true` may improve bitmap traversal times by
walking fewer objects.
+
* `pack.allowPackReuse=multi` may improve the time it takes to create a pack by
reusing objects from multiple packs instead of just one.
feature.manyFiles::
Enable config options that optimize for repos with many files in the
working directory. With many files, commands such as `git status` and
`git checkout` may be slow and these new defaults improve performance:
+
* `index.skipHash=true` speeds up index writes by not computing a trailing
checksum. Note that this will cause Git versions earlier than 2.13.0 to
refuse to parse the index and Git versions earlier than 2.40.0 will report
a corrupted index during `git fsck`.
+
* `index.version=4` enables path-prefix compression in the index.
+
* `core.untrackedCache=true` enables the untracked cache. This setting assumes
that mtime is working on your machine.