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| author | Tamir Duberstein <tamird@gmail.com> | 2026-06-10 11:50:01 -0700 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2026-06-10 12:38:49 -0700 |
| commit | 55088ac8a480d94ccf37bc53b6b2ddc7475b269b (patch) | |
| tree | bb7be712dc97d52f4e77ed23bc88b7515daea2af /t/t4013/diff.diff_initial..side | |
| parent | 94f057755b7941b321fd11fec1b2e3ca5313a4e0 (diff) | |
describe: limit default ref iteration to tags
Without --all, git describe ignores refs outside refs/tags/. Commit
8a5a1884e9 (Avoid accessing non-tag refs in git-describe unless --all is
requested, 2008-02-24) moved this check ahead of object lookup. That
avoided loading objects for irrelevant refs, but the backend still has
to yield every ref before get_name() can reject it.
Pass refs/tags/ to the iterator so the backend can avoid visiting those
refs in the first place.
The new perf test creates 10,000 unrelated packed refs. It measures:
git describe --exact-match HEAD
The runtime drops from 0.03(0.01+0.01) to 0.02(0.00+0.00). In a
repository with 120,532 refs but only 330 tags, the same command went
from 171.7 ms to 9.9 ms.
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/t4013/diff.diff_initial..side')
0 files changed, 0 insertions, 0 deletions