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Derrick Stolee 4b707a6e99 p1500: add is-base performance tests The previous two changes introduced a commit walking heuristic for finding the most likely base branch for a given source. This algorithm walks first-parent histories until reaching a collision. This walk _should_ be very fast. Exceptions include cases where a commit-graph file does not exist, leading to a full walk of all reachable commits to compute generation numbers, or a case where no collision in the first-parent history exists, leading to a walk of all first-parent history to the root commits. The p1500 test script guarantees a complete commit-graph file during its setup, so we will not test that scenario. Do create a new root commit in an effort to test the scenario of parallel first-parent histories. Even with the extra root commit, these tests take no longer than 0.02 seconds on my machine for the Git repository. However, the results are slightly more interesting in a copy of the Linux kernel repository: Test --------------------------------------------------------------- 1500.2: ahead-behind counts: git for-each-ref 0.12 1500.3: ahead-behind counts: git branch 0.12 1500.4: ahead-behind counts: git tag 0.12 1500.5: contains: git for-each-ref --merged 0.04 1500.6: contains: git branch --merged 0.04 1500.7: contains: git tag --merged 0.04 1500.8: is-base check: test-tool reach (refs) 0.03 1500.9: is-base check: test-tool reach (tags) 0.03 1500.10: is-base check: git for-each-ref 0.03 1500.11: is-base check: git for-each-ref (disjoint-base) 0.07 Signed-off-by: Derrick Stolee <stolee@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>		2024-08-14 10:10:06 -07:00
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Documentation	for-each-ref: add 'is-base' token	2024-08-14 10:10:06 -07:00
block-sha1	…
builtin	Merge branch 'js/var-git-shell-path'	2024-07-17 10:47:27 -07:00
ci	Merge branch 'rj/test-sanitize-leak-log-fix'	2024-07-17 10:47:24 -07:00
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gitweb	Merge branch 'am/gitweb-feed-use-committer-date'	2024-07-15 10:11:41 -07:00
mergetools	…
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oss-fuzz	…
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po	l10n: zh_CN: updated translation for 2.46	2024-07-28 19:52:41 +08:00
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reftable	Merge branch 'cp/unit-test-reftable-record'	2024-07-15 10:11:44 -07:00
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t	p1500: add is-base performance tests	2024-08-14 10:10:06 -07:00
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GIT-VERSION-GEN	Git 2.46	2024-07-29 07:14:09 -07:00
INSTALL	…
LGPL-2.1	…
Makefile	Merge branch 'cp/unit-test-reftable-record'	2024-07-15 10:11:44 -07:00
README.md	…
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SECURITY.md	…
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aclocal.m4	…
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add-patch.c	…
advice.c	Merge branch 'ds/advice-sparse-index-expansion'	2024-07-16 11:18:56 -07:00
advice.h	Merge branch 'ds/advice-sparse-index-expansion'	2024-07-16 11:18:56 -07:00
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commit-reach.c	commit-reach: add get_branch_base_for_tip	2024-08-14 10:10:05 -07:00
commit-reach.h	commit-reach: add get_branch_base_for_tip	2024-08-14 10:10:05 -07:00
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commit.c	commit: add gentle reference lookup method	2024-08-14 10:10:05 -07:00
commit.h	commit: add gentle reference lookup method	2024-08-14 10:10:05 -07:00
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config.mak.dev	Merge branch 'tb/dev-build-pedantic-fix'	2024-07-15 10:11:42 -07:00
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git-send-email.perl	Merge branch 'cb/send-email-sanitize-trailer-addresses'	2024-07-16 11:18:56 -07:00
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http.c	Merge branch 'jc/http-cookiefile'	2024-07-17 10:47:26 -07:00
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merge-ort.c	Merge branch 'en/ort-inner-merge-error-fix'	2024-07-16 11:18:55 -07:00
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midx-write.c	Merge branch 'ds/midx-write-repack-fix'	2024-07-23 16:54:33 -07:00
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ref-filter.c	for-each-ref: add 'is-base' token	2024-08-14 10:10:06 -07:00
ref-filter.h	for-each-ref: add 'is-base' token	2024-08-14 10:10:06 -07:00
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refs.c	Merge branch 'ps/ref-storage-migration-fix'	2024-07-23 16:54:34 -07:00
refs.h	Merge branch 'ch/refs-without-the-repository-fix'	2024-07-18 08:30:25 -07:00
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reset.c	…
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revision.c	…
revision.h	…
run-command.c	run-command: declare the `git_shell_path()` function globally	2024-07-13 16:23:37 -07:00
run-command.h	run-command: declare the `git_shell_path()` function globally	2024-07-13 16:23:37 -07:00
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scalar.c	…
send-pack.c	Merge branch 'jc/disable-push-nego-for-deletion'	2024-07-15 10:11:43 -07:00
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serve.c	…
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shared.mak	…
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sigchain.c	…
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sparse-index.c	Merge branch 'ds/advice-sparse-index-expansion'	2024-07-16 11:18:56 -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