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From bf9c0cbddbcd730e4312ba5e19f8b8a2edd65bb3 Mon Sep 17 00:00:00 2001
Message-Id: <bf9c0cbddbcd730e4312ba5e19f8b8a2edd65bb3.1630319075.git.ps@pks.im>
In-Reply-To: <29ef1f27fed21b5b7d3c996a01f1364e7e841917.1630319075.git.ps@pks.im>
References: <29ef1f27fed21b5b7d3c996a01f1364e7e841917.1630319075.git.ps@pks.im>
From: Patrick Steinhardt <ps@pks.im>
Date: Mon, 9 Aug 2021 10:11:54 +0200
Subject: [PATCH 4/6] revision: stop retrieving reference twice
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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>
---
revision.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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;
}
--
2.33.0
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