mirror of
https://github.com/git/git.git
synced 2026-01-16 21:59:45 +00:00
c83f032e09
We already apply a bias on the initial delta attempt with max_size being a function of the base object depth. This has the effect of favoring shallower deltas even if deeper deltas could be smaller, and therefore creating a wider delta tree (see commits4e8da195andc3b06a69). This principle should also be applied to all delta attempts for the same object and not only the first attempt. With this the criteria for the best delta is not only its size but also its depth, so that a shallower delta might be selected even if it is larger than a deeper one. Even if some deltas get larger, they allow for wider delta trees making the depth limit less quickly reached and therefore better deltas can be subsequently found, keeping the resulting pack size even smaller. Runtime access to the pack should also benefit from shallower deltas. Testing on different repositories showed slighter faster repacks, smaller resulting packs, and a much nicer curve for delta depth distribution with no more peak at the maximum depth level. Improvements are even more significant with smaller depth limits. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
//////////////////////////////////////////////////////////////// GIT - the stupid content tracker //////////////////////////////////////////////////////////////// "git" can mean anything, 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 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. It was originally written by Linus Torvalds with help of a group of hackers around the net. It is currently maintained by Junio C Hamano. Please read the file INSTALL for installation instructions. See Documentation/tutorial.txt to get started, then see Documentation/everyday.txt for a useful minimum set of commands, and "man git-commandname" for documentation of each command. CVS users may also want to read Documentation/cvs-migration.txt. Many Git online resources are accessible from http://git.or.cz/ including full documentation and Git related tools. 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. To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org. The mailing list archives are available at http://marc.theaimsgroup.com/?l=git and other archival sites. The messages titled "A note from the maintainer", "What's in git.git (stable)" and "What's cooking in git.git (topics)" and the discussion following them on the mailing list give a good reference for project status, development direction and remaining tasks.