d4de6513cd
Since 'git pack-objects' supports a --path-walk option, allow passing it through in 'git repack'. This presents interesting testing opportunities for comparing the different repacking strategies against each other. Add the --path-walk option to the performance tests in p5313. For the microsoft/fluentui repo [1] checked out at a specific commit [2], the results are very interesting: Test this tree ------------------------------------------------------------------ 5313.2: thin pack 0.40(0.47+0.04) 5313.3: thin pack size 1.2M 5313.4: thin pack with --full-name-hash 0.09(0.10+0.04) 5313.5: thin pack size with --full-name-hash 22.8K 5313.6: thin pack with --path-walk 0.08(0.06+0.02) 5313.7: thin pack size with --path-walk 20.8K 5313.8: big pack 2.16(8.43+0.23) 5313.9: big pack size 17.7M 5313.10: big pack with --full-name-hash 1.42(3.06+0.21) 5313.11: big pack size with --full-name-hash 18.0M 5313.12: big pack with --path-walk 2.21(8.39+0.24) 5313.13: big pack size with --path-walk 17.8M 5313.14: repack 98.05(662.37+2.64) 5313.15: repack size 449.1K 5313.16: repack with --full-name-hash 33.95(129.44+2.63) 5313.17: repack size with --full-name-hash 182.9K 5313.18: repack with --path-walk 106.21(121.58+0.82) 5313.19: repack size with --path-walk 159.6K [1] https://github.com/microsoft/fluentui [2] e70848ebac1cd720875bccaa3026f4a9ed700e08 This repo suffers from having a lot of paths that collide in the name hash, so examining them in groups by path leads to better deltas. Also, in this case, the single-threaded implementation is competitive with the full repack. This is saving time diffing files that have significant differences from each other. A similar, but private, repo has even more extremes in the thin packs: Test this tree -------------------------------------------------------------- 5313.2: thin pack 2.39(2.91+0.10) 5313.3: thin pack size 4.5M 5313.4: thin pack with --full-name-hash 0.29(0.47+0.12) 5313.5: thin pack size with --full-name-hash 15.5K 5313.6: thin pack with --path-walk 0.35(0.31+0.04) 5313.7: thin pack size with --path-walk 14.2K Notice, however, that while the --full-name-hash version is working quite well in these cases for the thin pack, it does poorly for some other standard cases, such as this test on the Linux kernel repository: Test this tree -------------------------------------------------------------- 5313.2: thin pack 0.01(0.00+0.00) 5313.3: thin pack size 310 5313.4: thin pack with --full-name-hash 0.00(0.00+0.00) 5313.5: thin pack size with --full-name-hash 1.4K 5313.6: thin pack with --path-walk 0.00(0.00+0.00) 5313.7: thin pack size with --path-walk 310 Here, the --full-name-hash option does much worse than the default name hash, but the path-walk option does exactly as well. Signed-off-by: Derrick Stolee <stolee@gmail.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.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