grit://cooking/bench/pull/fast-forward@git-git

grit pull · fast-forward @git-git

Fast-forward pull vs git pull --ff-only

repo: Upstream git/git pinned at v2.47.0, full history · 4,525 files · 75,031 commits · 954 refs

$ grit-bench daily --only pull/fast-forward@git-git2026-10-27 · grit 8dbc58e77 · git version 2.43.0

tool	median	min	max	runs	peak memory
git	123 ms	118 ms	129 ms	18	73 MB
grit	51 ms	48 ms	55 ms	18	48 MB

grit is 2.4× fastermemory: 1.5× less

every timed run (log scale)

git

grit

38 ms163 ms

How it's measured

setup

remote http://127.0.0.1:35987/remote.git served by git http-backend (git's own smart HTTP server)

before each run

grit-bench prepare-network-fetch-incr --git git --bare /tmp/grit-bench-scratch/daily-remote-git-git/remote.git

git runs

$ git pull --ff-only -q origin master

grit runs

$ grit pull

checked first

before timing, git and grit were each run once and their results compared; the result is verified after every timed run

Where the time goesone extra traced run per tool, outside the timed runs

git · median run 123 ms

run: git fetch

112 ms

run: git remote-http

88 ms

run: git-remote-http

86 ms

fetch: fetch_refs

57 ms

run: git fetch-pack

57 ms

fetch: consume_refs

21 ms

run: git rev-list

20 ms

fetch-pack: negotiation_v0_v1

18 ms

fetch-pack: parse_remote_refs_and_find_cutoff

14 ms

run: git merge

9.6 ms

fetch: remote_refs

7.3 ms

fetch-pack: mark_common_remote_refs

6.6 ms

run: git maintenance ×2

4.2 ms

run: git index-pack

4.2 ms

negotiation_: round

3.6 ms

index: preload

1.6 ms

index: do_read_index ×3

1.3 ms

index: do_write_index

1.2 ms

unpack_trees: unpack_trees

1.1 ms

fetch-pack: mark_complete_local_refs

0.9 ms

grit · median run 51 ms

grit.pack.index

1.7 ms

grit.index.write

1.2 ms

grit.pack.delta.resolve

0.8 ms

grit.index.read ×2

0.8 ms

grit.pack.index.open ×85

0.5 ms

grit.repository.open ×2

0.3 ms

grit.config.load ×4

0.1 ms

grit.diff.tree

0.0 ms

grit.checkout.plan

0.0 ms

Every day8 days

date	grit commit	git	grit	grit vs git	grit peak
2026-10-27	8dbc58e77	123 ms	51 ms	2.4× faster	48 MB
2026-10-26	c7cf2c443	121 ms	153 ms	1.3× slower	93 MB
2026-10-25	2824ad391	120 ms	53 ms	2.2× faster	47 MB
2026-10-24	157a05dde	123 ms	755 ms	6.1× slower	64 MB
2026-10-23	bddf92f86	118 ms	22 ms	5.4× faster	33 MB
2026-10-22	4c131b942	119 ms	21 ms	5.8× faster	27 MB
2026-10-21	d4844e92a	134 ms	23 ms	5.9× faster	30 MB
2026-10-20	4754ad0b9	139 ms	1.30 s	9.3× slower	114 MB