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f39addd0d9
1c56fc2084(name-rev: pre-size buffer in get_parent_name(), 2020-02-04) got a big performance boost in an unusual repository by calculating the name length in advance. This is a bit awkward, as it references the name components twice. Use a memory pool to store the strings for the struct rev_name member tip_name. Using mem_pool_strfmt() allows efficient allocation without explicit size calculation. This simplifies the formatting part of the code without giving up performance: Benchmark 1: ./git_2.44.0 -C ../chromium/src name-rev --all Time (mean ± σ): 1.231 s ± 0.013 s [User: 1.082 s, System: 0.136 s] Range (min … max): 1.214 s … 1.252 s 10 runs Benchmark 2: ./git -C ../chromium/src name-rev --all Time (mean ± σ): 1.220 s ± 0.020 s [User: 1.083 s, System: 0.130 s] Range (min … max): 1.197 s … 1.254 s 10 runs Don't bother discarding the memory pool just before exiting. The effort for that would be very low, but actually measurable in the above example, with no benefit to users. At least UNLEAK it to calm down leak checkers. This addresses the leaks that45a14f578e(Revert "name-rev: release unused name strings", 2022-04-22) brought back. Signed-off-by: René Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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