On Mon, 12 Nov 2007, Brian Downing wrote: > > depths: count 135970 total 120567366 min 0 max 6035 mean 886.72 median 3 std_dev 1653.48 > > Needless to say the pack that resulted was just about useless. Trying to > repack it resulted in the "counting objects" phase running at about five > objects per second. Hmm. Quick hack: increase the delta cache window. The reason (I think) why performance turns glacial with really deep delta chains is that it turns into an O(n^2) thing when you don't hit in the delta cache, and your delta depth is so deep that following a *single* delta chain will flush the cache. So I bet that making the delta cache bigger will "fix" it. You probably don't have to make it 6000+ entries, but with the *median* being that deep, making it 2k entries should improve it for most cases. Obviously fastimport should be fixed to not do those insanely deep chains too, but it might be a good idea to at least make the delta cache a bit bigger by default, and perhaps have some config option for setting it. 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
