4e00f13e7e
When performing auto-maintenance with geometric repacking we have two conditions that may trigger a repack: - Either the geometric sequence of packfiles is invalidated. - Or we have too many loose objects. The first condition shouldn't trigger all that often: it may be hit when we fetch a new packfile, but users tend to not do that all the time. The second condition is what typically triggers more regularly though, as every command that ends up writing new objects may cause us to cross the threshold of loose objects. It is thus preferable to not be too aggressive here, as otherwise we may end up repacking objects quite often. For the geometric-repacking strategy though we have a default of 100 objects, only. As we're approximating the count of objects by only reading the "objects/17/" shared, we'd only need 2 objects in there before we perform a repack by default, which is quite aggressive. git-gc(1) on the other hand has a default of 6700, so it is quite a bit more conservative here. Being this aggressive is also causing problems as reported by our users. When running lots of concurrent writers, those writes will constantly end up spawning maintenance jobs that end up repacking objects. As we also prune objects, a concurrently running process that tries to write an object may see that the sharding directories get removed under their feet. While we try re-creating such leading directories, we only do so a single time, and it may happen that the directory vanishes again before we had the chance to create the loose object. This is not a new problem, but it is exacerbated by us running maintenance this aggressively. Improve the status quo by reducing the frequency at which we pack loose objects to the same frequency that git-gc(1) uses. Reported-by: Stefan Haller <lists@haller-berlin.de> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com> |
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| Documentation | ||
| bin-wrappers | ||
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| builtin | ||
| ci | ||
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| compiler-tricks | ||
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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.adoc to get started, then see
Documentation/giteveryday.adoc for a useful minimum set of commands, and
Documentation/git-<commandname>.adoc 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.adoc
(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