Derrick Stolee 318fd94635 pack-objects: add --path-walk option
In order to more easily compute delta bases among objects that appear at the
exact same path, add a --path-walk option to 'git pack-objects'.

This option will use the path-walk API instead of the object walk given by
the revision machinery. Since objects will be provided in batches
representing a common path, those objects can be tested for delta bases
immediately instead of waiting for a sort of the full object list by
name-hash. This has multiple benefits, including avoiding collisions by
name-hash.

The objects marked as UNINTERESTING are included in these batches, so we
are guaranteeing some locality to find good delta bases.

After the individual passes are done on a per-path basis, the default
name-hash is used to find other opportunistic delta bases that did not
match exactly by the full path name.

RFC TODO: It is important to note that this option is inherently
incompatible with using a bitmap index. This walk probably also does not
work with other advanced features, such as delta islands.

Getting ahead of myself, this option compares well with --full-name-hash
when the packfile is large enough, but also performs at least as well as
the default in all cases that I've seen.

RFC TODO: this should probably be recording the batch locations to another
list so they could be processed in a second phase using threads.

RFC TODO: list some examples of how this outperforms previous pack-objects
strategies. (This is coming in later commits that include performance
test changes.)

Signed-off-by: Derrick Stolee <stolee@gmail.com>
2024-09-25 19:50:28 +02:00
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2024-09-24 13:38:25 +02:00
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Description
A fork of Git containing Windows-specific patches.
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