grit://cooking/bench/rebase/onto@git-git

grit rebase · onto @git-git

Rebase onto HEAD~10 vs git rebase on pinned git.git (conflict-free replay)

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

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

tool	median	min	max	runs	peak memory
git	561 ms	344 ms	598 ms	6	66 MB
grit	6.7 ms	6.3 ms	6.9 ms	6	25 MB

grit is 83× fastermemory: 2.6× less

every timed run (log scale)

git

grit

5.0 ms753 ms

How it's measured

before each run

set -eu cd /tmp/grit-bench-scratch/daily-git-git-wt/worktree-run-git-git-wt && (git rebase --abort 2>/dev/null || true) set -eu 'grit-bench' prepare-daily-reset --git git

git runs

$ set -eu; GIT_CONFIG_NOSYSTEM=1 GIT_CONFIG_GLOBAL='/tmp/grit-bench-global-config' GIT_CONFIG_SYSTEM=/dev/null GIT_AUTHOR_NAME=Bench GIT_AUTHOR_EMAIL=b@example.com GIT_COMMITTER_NAME=Bench GIT_COMMITTER_EMAIL=b@example.com GIT_COMMITTER_DATE='1700000100 +0000' git rebase HEAD~10 >/dev/null

grit runs

$ set -eu; grit rebase HEAD~10 >/dev/null

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

git · median run 561 ms

index: do_write_index ×28

286 ms

unpack_trees: unpack_trees ×51

109 ms

merge: checkout ×24

51 ms

unpack_trees: traverse_trees ×51

36 ms

index: refresh ×3

17 ms

merge: incore_nonrecursive ×24

14 ms

merge: process_entries ×72

12 ms

cache_tree: update ×24

8.8 ms

index: do_read_index ×26

4.3 ms

merge: collect_merge_info ×24

4.3 ms

merge: traverse_trees ×24

3.2 ms

index: preload ×3

2.9 ms

merge: plist ×72

2.2 ms

run: git notes

2.2 ms

merge: processing ×24

1.6 ms

cache_tree: write ×28

1.1 ms

cache_tree: read ×26

1.0 ms

cache-tree: prime_cache_tree

0.9 ms

merge: write_auto_merge ×24

0.6 ms

merge: merge_start ×24

0.3 ms

grit · median run 6.7 ms

grit.repository.open ×2

0.3 ms

grit.config.load ×4

0.1 ms

grit.pack.index.open

0.0 ms

Every day8 days

date	grit commit	git	grit	grit vs git	grit peak
2026-10-27	8dbc58e77	561 ms	6.7 ms	83× faster	25 MB
2026-10-26	c7cf2c443	802 ms	8.5 ms	95× faster	24 MB
2026-10-25	2824ad391	622 ms	7.7 ms	81× faster	25 MB
2026-10-24	157a05dde	593 ms	8.2 ms	72× faster	25 MB
2026-10-23	bddf92f86	530 ms	714 ms	1.3× slower	119 MB
2026-10-22	4c131b942	—	not run	—	—
2026-10-21	d4844e92a	—	not run	—	—
2026-10-20	4754ad0b9	—	not run	—	—