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author | Patrick Steinhardt <ps@pks.im> | 2021-08-09 11:11:54 +0300 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2021-08-09 19:51:12 +0300 |
commit | bf9c0cbddbcd730e4312ba5e19f8b8a2edd65bb3 (patch) | |
tree | 0387a4ad997b27b47dc52d5010135a7bed37001b /revision.c | |
parent | f45022dc2fd692fd024f2eb41a86a66f19013d43 (diff) |
revision: stop retrieving reference twice
When queueing up references for the revision walk, `handle_one_ref()`
will resolve the reference's object ID via `get_reference()` and then
queue the ID as pending object via `add_pending_oid()`. But given that
`add_pending_oid()` is only a thin wrapper around `add_pending_object()`
which fist calls `get_reference()`, we effectively resolve the reference
twice and thus duplicate some of the work.
Fix the issue by instead calling `add_pending_object()` directly, which
takes the already-resolved object as input. In a repository with lots of
refs, this translates into a near 10% speedup:
Benchmark #1: HEAD~: rev-list --unsorted-input --objects --quiet --not --all --not $newrev
Time (mean ± σ): 5.015 s ± 0.038 s [User: 4.698 s, System: 0.316 s]
Range (min … max): 4.970 s … 5.089 s 10 runs
Benchmark #2: HEAD: rev-list --unsorted-input --objects --quiet --not --all --not $newrev
Time (mean ± σ): 4.606 s ± 0.029 s [User: 4.260 s, System: 0.345 s]
Range (min … max): 4.565 s … 4.657 s 10 runs
Summary
'HEAD: rev-list --unsorted-input --objects --quiet --not --all --not $newrev' ran
1.09 ± 0.01 times faster than 'HEAD~: rev-list --unsorted-input --objects --quiet --not --all --not $newrev'
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'revision.c')
-rw-r--r-- | revision.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/revision.c b/revision.c index 47541407d2..80a59896b9 100644 --- a/revision.c +++ b/revision.c @@ -1534,7 +1534,7 @@ static int handle_one_ref(const char *path, const struct object_id *oid, object = get_reference(cb->all_revs, path, oid, cb->all_flags); add_rev_cmdline(cb->all_revs, object, path, REV_CMD_REF, cb->all_flags); - add_pending_oid(cb->all_revs, path, oid, cb->all_flags); + add_pending_object(cb->all_revs, object, path); return 0; } |