grit://cooking/bench/fetch/incremental@git-git

grit fetch · incremental @git-git

Incremental fetch vs git fetch

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

$ grit-bench daily --only fetch/incremental@git-git2026-10-27 · grit 8dbc58e77 · git version 2.43.0

tool	median	min	max	runs	peak memory
git	110 ms	108 ms	113 ms	20	68 MB
grit	46 ms	44 ms	50 ms	20	48 MB

grit is 2.4× fastermemory: 1.4× less

every timed run (log scale)

git

grit

35 ms142 ms

How it's measured

setup

remote http://127.0.0.1:41757/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 fetch origin

grit runs

$ grit fetch origin

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 110 ms

run: git remote-http

89 ms

run: git-remote-http

88 ms

fetch: fetch_refs

62 ms

run: git fetch-pack

62 ms

fetch-pack: negotiation_v0_v1

19 ms

fetch: consume_refs

17 ms

run: git rev-list

16 ms

fetch-pack: parse_remote_refs_and_find_cutoff

15 ms

fetch: remote_refs

7.4 ms

run: git index-pack

7.2 ms

fetch-pack: mark_common_remote_refs

6.8 ms

negotiation_: round

3.8 ms

run: git maintenance

1.9 ms

fetch-pack: mark_complete_local_refs

0.9 ms

index: do_read_index

0.4 ms

submodule: parallel/fetch

0.1 ms

cache_tree: read

0.0 ms

grit · median run 46 ms

grit.pack.index

1.3 ms

grit.pack.index.open ×93

0.6 ms

grit.pack.delta.resolve

0.4 ms

grit.repository.open ×2

0.3 ms

grit.config.load ×4

0.1 ms

Every day8 days

date	grit commit	git	grit	grit vs git	grit peak
2026-10-27	8dbc58e77	110 ms	46 ms	2.4× faster	48 MB
2026-10-26	c7cf2c443	104 ms	145 ms	1.4× slower	95 MB
2026-10-25	2824ad391	106 ms	47 ms	2.2× faster	47 MB
2026-10-24	157a05dde	112 ms	746 ms	6.7× slower	64 MB
2026-10-23	bddf92f86	104 ms	14 ms	7.4× faster	33 MB
2026-10-22	4c131b942	109 ms	14 ms	7.8× faster	27 MB
2026-10-21	d4844e92a	122 ms	15 ms	8.1× faster	30 MB
2026-10-20	4754ad0b9	128 ms	1.25 s	9.8× slower	110 MB