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When there are N deleted paths and M created paths, we used to allocate (N x M) "struct diff_score" that record how similar each of the pair is, and picked the <src,dst> pair that gives the best match first, and then went on to process worse matches. This sorting is done so that when two new files in the postimage that are similar to the same file deleted from the preimage, we can process the more similar one first, and when processing the second one, it can notice "Ah, the source I was planning to say I am a copy of is already taken by somebody else" and continue on to match itself with another file in the preimage with a lessor match. This matters to a change introduced between 1.5.3.X series and 1.5.4-rc, that lets the code to favor unused matches first and then falls back to using already used matches. This instead allocates and keeps only a handful rename source candidates per new files in the postimage. I.e. it makes the memory requirement from O(N x M) to O(M). For each dst, we compute similarlity with all sources (i.e. the number of similarity estimate computations is still O(N x M)), but we keep handful best src candidates for each dst. 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.