From 853bd0d267da523ccd378d8e95f5c98d44c6f3b5 Mon Sep 17 00:00:00 2001 From: Patrick Steinhardt Date: Wed, 29 Nov 2023 08:25:09 +0100 Subject: [PATCH] t5401: speed up creation of many branches MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit One of the tests in t5401 creates a bunch of branches by calling git-branch(1) for every one of them. This is quite inefficient and takes a comparatively long time even on Unix systems where spawning processes is comparatively fast. Refactor it to instead use git-update-ref(1), which leads to an almost 10-fold speedup: ``` Benchmark 1: ./t5401-update-hooks.sh (rev = HEAD) Time (mean ± σ): 983.2 ms ± 97.6 ms [User: 328.8 ms, System: 679.2 ms] Range (min … max): 882.9 ms … 1078.0 ms 3 runs Benchmark 2: ./t5401-update-hooks.sh (rev = HEAD~) Time (mean ± σ): 9.312 s ± 0.398 s [User: 2.766 s, System: 6.617 s] Range (min … max): 8.885 s … 9.674 s 3 runs Summary ./t5401-update-hooks.sh (rev = HEAD) ran 9.47 ± 1.02 times faster than ./t5401-update-hooks.sh (rev = HEAD~) ``` Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano --- t/t5401-update-hooks.sh | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/t/t5401-update-hooks.sh b/t/t5401-update-hooks.sh index 001b7a17ad..8b8bc47dc0 100755 --- a/t/t5401-update-hooks.sh +++ b/t/t5401-update-hooks.sh @@ -133,10 +133,8 @@ test_expect_success 'pre-receive hook that forgets to read its input' ' EOF rm -f victim.git/hooks/update victim.git/hooks/post-update && - for v in $(test_seq 100 999) - do - git branch branch_$v main || return - done && + printf "create refs/heads/branch_%d main\n" $(test_seq 100 999) >input && + git update-ref --stdin