On Tue, 11 Dec 2007, Linus Torvalds wrote: > > We do that. The expense for git is that we don't do the revisions as a > single file at all. We'll look through each commit, check whether the > "gcc" directory changed, if it did, we'll go into it, and check whether > the "ChangeLog" file changed - and if it did, we'll actually diff it > against the previous version. And, btw: the diff is totally different from the xdelta we have, so even if we have an already prepared nice xdelta between the two versions, we'll end up re-generating the files in full, and then do a diff on the end result. Of course, part of that is that git logically *never* works with deltas, except in the actual code-paths that generate objects (or generate packs, of course). So even if we had used a delta algorithm that would be amenable to be turned into a diff directly, it would have been a layering violation to actually do that. Other systems can sometimes just re-use their deltas to generate the diffs and/or blame information. I dunno whether SVN does that. CVS does, afaik. Linus - To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
