> Thank you for filling out a Git bug report! > Please answer the following questions to help us understand your issue. > > What did you do before the bug happened? (Steps to reproduce your issue) $ git clone https://github.com/torvalds/linux $ cd linux $ git checkout c61e41121036 $ time git describe --match=v6.10-rc7 --debug describe HEAD No exact match on refs or tags, searching to describe finished search at d8470b7c13e11c18cf14a7e3180f0b00e715e4f0 annotated 1844 v6.10-rc7 traversed 1282750 commits v6.10-rc7-1844-gc61e41121036 real 0m9.243s user 0m8.940s sys 0m0.268s $ time git describe v6.10-rc7-1844-gc61e41121036 real 0m0.149s user 0m0.111s sys 0m0.036s > What did you expect to happen? (Expected behavior) I expected "git describe --match=v6.10-rc7" to be faster than plain "git describe". > What happened instead? (Actual behavior) It takes over 9 seconds and traverses 1282750 commits. (In my actual Linux git repo it's even worse at 15 seconds due to more git history.) > What's different between what you expected and what actually happened? Over 9 seconds :-) > Anything else you want to add: I see this with both version 2.47.0 and the next branch. This command is used by the kernel setlocalversion script, which is run for every kernel build, so it adds 10-15 seconds to every build on an untagged commit. I suspect the problem is that there's only a single match for "v6.10-rc7", but it tries to find 10 candidates so it ends up searching the entire history. But "--candidates=1" doesn't seem to help unless I add a second match like so: $ time git describe --match=v6.10-rc7 --match=v6.10-rc6 --candidates=1 v6.10-rc7-1844-gc61e41121036 real 0m0.112s user 0m0.081s sys 0m0.031s > Please review the rest of the bug report below. > You can delete any lines you don't wish to share. [System Info] git version: git version 2.47.0 cpu: x86_64 no commit associated with this build sizeof-long: 8 sizeof-size_t: 8 shell-path: /bin/sh libcurl: 8.6.0 OpenSSL: OpenSSL 3.2.2 4 Jun 2024 zlib: 1.3.1.zlib-ng uname: Linux 6.10.12-200.fc40.x86_64 #1 SMP PREEMPT_DYNAMIC Mon Sep 30 21:38:25 UTC 2024 x86_64 compiler info: gnuc: 14.2 libc info: glibc: 2.39 $SHELL (typically, interactive shell): /bin/bash [Enabled Hooks] -- Josh
