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Patrick Steinhardt 037df60013 object-name: don't try to abbreviate to lengths greater than hexsz When given a length that equals the current hash algorithm's hex size, then `repo_find_unique_abbrev_r()` exits early without trying to find an abbreviation. This is only sensible because there is nothing to abbreviate in the first place, so searching through objects to find a unique prefix would be a waste of compute. What we don't handle though is the case where the user passes a length greater than the hash length. This is fine in practice as we still compute the correct result. But at the very least, this is a waste of resources as we try to abbreviate a value that cannot be abbreviated, which causes us to hit the object database. Start to explicitly handle values larger than hexsz to avoid this performance penalty, which leads to a measureable speedup. The following benchmark has been executed in linux.git: Benchmark 1: git -c core.abbrev=9000 log --abbrev-commit (revision = HEAD~) Time (mean ± σ): 12.812 s ± 0.040 s [User: 12.225 s, System: 0.554 s] Range (min … max): 12.723 s … 12.857 s 10 runs Benchmark 2: git -c core.abbrev=9000 log --abbrev-commit (revision = HEAD) Time (mean ± σ): 11.095 s ± 0.029 s [User: 10.546 s, System: 0.521 s] Range (min … max): 11.037 s … 11.122 s 10 runs Summary git -c core.abbrev=9000 log --abbrev-commit HEAD (revision = HEAD) ran 1.15 ± 0.00 times faster than git -c core.abbrev=9000 log --abbrev-commit HEAD (revision = HEAD~) Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>		2024-06-12 12:57:18 -07:00
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config.c	config: fix segfault when parsing "core.abbrev" without repo	2024-06-12 12:57:18 -07:00
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object-name.c	object-name: don't try to abbreviate to lengths greater than hexsz	2024-06-12 12:57:18 -07:00
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parse-options-cb.c	parse-options-cb: stop clamping "--abbrev=" to hash length	2024-06-12 12:57:18 -07:00
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README.md

Git - fast, scalable, distributed revision control system

Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.

See Documentation/gittutorial.txt to get started, then see Documentation/giteveryday.txt for a useful minimum set of commands, and Documentation/git-<commandname>.txt for documentation of each command. If git has been correctly installed, then the tutorial can also be read with man gittutorial or git help tutorial, and the documentation of each command with man git-<commandname> or git help <commandname>.

CVS users may also want to read Documentation/gitcvs-migration.txt (man gitcvs-migration or git help cvs-migration if git is installed).

The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission and Documentation/CodingGuidelines).

Those wishing to help with error message, usage and informational message string translations (localization l10) should see po/README.md (a po file is a Portable Object file that holds the translations).

To subscribe to the list, send an email to git+subscribe@vger.kernel.org (see https://subspace.kernel.org/subscribing.html for details). The mailing list archives are available at https://lore.kernel.org/git/, https://marc.info/?l=git and other archival sites.

Issues which are security relevant should be disclosed privately to the Git Security mailing list git-security@googlegroups.com.

The maintainer frequently sends the "What's cooking" reports that list the current status of various development topics to the mailing list. The discussion following them give a good reference for project status, development direction and remaining tasks.

The name "git" was given by Linus Torvalds when he wrote the very first version. He described the tool as "the stupid content tracker" and the name as (depending on your mood):

random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant.
stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
"global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
"goddamn idiotic truckload of sh*t": when it breaks