| commit | be18153b975844f8792b03e337f1a4c86fe87531 | [log] [tgz] |
|---|---|---|
| author | Jacob Vosmaer <jacob@gitlab.com> | Wed Jan 20 13:45:14 2021 +0100 |
| committer | Junio C Hamano <gitster@pobox.com> | Fri Jan 22 17:27:42 2021 -0800 |
| tree | a3afd5d4480bac8efd6065542328bf126dd0e9b4 | |
| parent | 66e871b6647ffea61a77a0f82c7ef3415f1ee79c [diff] |
builtin/pack-objects.c: avoid iterating all refs In git-pack-objects, we iterate over all the tags if the --include-tag option is passed on the command line. For some reason this uses for_each_ref which is expensive if the repo has many refs. We should use for_each_tag_ref instead. Because the add_ref_tag callback will now only visit tags we simplified it a bit. The motivation for this change is that we observed performance issues with a repository on gitlab.com that has 500,000 refs but only 2,000 tags. The fetch traffic on that repo is dominated by CI, and when we changed CI to fetch with 'git fetch --no-tags' we saw a dramatic change in the CPU profile of git-pack-objects. This lead us to this particular ref walk. More details in: https://gitlab.com/gitlab-com/gl-infra/scalability/-/issues/746#note_483546598 Signed-off-by: Jacob Vosmaer <jacob@gitlab.com> Reviewed-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.
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