From: Duy Nguyen Date: Thu, 20 Feb 2014 23:35:06 GMT Subject: Re: git gc --aggressive led to about 40 times slower "git log --raw" Message-ID: In-Reply-To: On Thu, Feb 20, 2014 at 1:59 AM, Junio C Hamano wrote: > Philippe Vaucher writes: > >>> fwiw this is the thread that added --depth=250 >>> >>> http://thread.gmane.org/gmane.comp.gcc.devel/94565/focus=94626 >> >> This post is quite interesting: >> http://article.gmane.org/gmane.comp.gcc.devel/94637 > > Yes, it most clearly says that --depth=250 was *not* a > recommendation, with technical background to explain why such a long > delta chain is a bad idea. On the other hand, the size reduction is really nice (320MB vs 500MB). I don't know if we can do this, but does it make sense to apply --depth=250 for old commits only and shallow depth for recent commits? For old projects, commits older than 1-2 years is probably less often accessed and could use some aggressive packing. This still hits git-blame badly. We could even make sure all objects "on the blame surface" have short delta chain. But that may be pushing pack-objects too much. -- Duy