# very slow "git gc --aggressive" in GIT-1.6.4.4 2 messages from 2009-09-18 to 2009-09-18. Participants: Leo Razoumov, Michael Andreen. Thread: https://gitlist.dev/t/20999 ## Leo Razoumov, 2009-09-18 19:23 Subject: very slow "git gc --aggressive" in GIT-1.6.4.4 Message-ID: URL: https://gitlist.dev/e/ee2a733e0909181223j1ffc99edkdb3700adb37fa147%40mail.gmail.com ``` I noticed that "git gc --agressive" takes 5 times longer with git-1.6.4.4 than with git-1.6.2.5. Below are benchmarks on my Linux Ubuntu-9.04 laptop (Core2 Duo 2.54GHz). As a test repo I use a mirror of the official GIT upstream. GIT-v1.6.4.4 ----------------- git.upstream> time git gc --agressive Counting objects: 105217, done. Delta compression using up to 2 threads. Compressing objects: 100% (103507/103507), done. Writing objects: 100% (105217/105217), done. Total 105217 (delta 77228), reused 0 (delta 0) git gc --aggressive 168.31s user 0.58s system 180% cpu 1:33.52 total GIT-1.6.2.5.LR1 --------------------- git.upstream> time git gc --aggressive Counting objects: 105217, done. Delta compression using 2 threads. Compressing objects: 100% (103507/103507), done. Writing objects: 100% (105217/105217), done. Total 105217 (delta 76235), reused 0 (delta 0) git gc --aggressive 30.97s user 0.48s system 141% cpu 22.177 total ========================================== 168 seconds for git-1.6.4.4 versus 22 seconds for git-1.6.2.5. What gives? --Leo-- ``` ## Michael Andreen, 2009-09-18 19:56 Subject: Re: very slow "git gc --aggressive" in GIT-1.6.4.4 Message-ID: <200909182156.56587.harv@ruin.nu> URL: https://gitlist.dev/e/200909182156.56587.harv%40ruin.nu In-Reply-To: ``` On Friday 18 September 2009 21:23:59 Leo Razoumov wrote: > I noticed that "git gc --agressive" takes 5 times longer with > git-1.6.4.4 than with git-1.6.2.5. > > Below are benchmarks on my Linux Ubuntu-9.04 laptop (Core2 Duo 2.54GHz). > As a test repo I use a mirror of the official GIT upstream. git-1.6.3 and later changed the settings for --aggressive to window=250 and depth=250, which produces a tighter pack. The earlier setting wasn't really aggressive. /Michael ```