On Thu, 10 Jan 2008, Linus Torvalds wrote: > > > On Thu, 10 Jan 2008, Nicolas Pitre wrote: > > > > Here's my rather surprising results: > > > > My kernel repo pack size without the patch: 184275401 bytes > > Same repo with the above patch applied: 205204930 bytes > > > > So it is only 11% larger. I was expecting much more. > > It's probably worth doing those statistics on some other projects. > > Maybe the difference to other repositories isn't huge, and maybe the > kernel *is* a good test-case, but I just wouldn't take that for granted. Obviously. This was a really crud test, and my initial goal was to quickly dismiss Pierre's assertion. Turns out that he wasn't that wrong after all, and if a significant increase in access speed by avoiding zlib for 82% of object accesses can also be demonstrated for the kernel, then we have an opportunity for some optimization tradeoff with no backward compatibility concerns. > Yes, delta's are bound to compress much less well than non-deltas, and > especially for tree objects (which is a large chunk of them) they probably > compress even less (because a big part of the delta is actually just the > SHA1 changes), but if it's 11% on the kernel, it could easily be 25% on > something else. Right. But again this is not worth pursuing if a significant speed increase in repo access is not demonstrated at least with the kernel. Nicolas - 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
