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From: Elijah Newren <newren@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org,
	Johannes Schindelin <Johannes.Schindelin@gmx.de>,
	Elijah Newren <newren@gmail.com>
Subject: [PATCH v2 17/16] t3427: accelerate this test by using fast-export and fast-import
Date: Wed,  4 Sep 2019 14:40:48 -0700	[thread overview]
Message-ID: <20190904214048.29331-1-newren@gmail.com> (raw)
In-Reply-To: <pull.294.v2.git.gitgitgadget@gmail.com>

fast-export and fast-import can easily handle the simple rewrite that
was being done by filter-branch, and should be faster on systems with a
slow fork.  Measuring the overall time taken for all of t3427 (not just
the difference between filter-branch and fast-export/fast-import) shows
a speedup of about 5% on Linux and 11% on Mac.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
This patch is meant to be added onto the end of js/rebase-r-strategy; an
earlier version of this patch conflicted js/rebase-r-strategy so now I'm
basing on top of that series.  The speedup is also less impressive now
that there is only one filter-branch invocation being replaced instead of
a handful.  Still a nice speedup, though.

 t/t3427-rebase-subtree.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/t/t3427-rebase-subtree.sh b/t/t3427-rebase-subtree.sh
index 39e348de16..bec48e6a1f 100755
--- a/t/t3427-rebase-subtree.sh
+++ b/t/t3427-rebase-subtree.sh
@@ -59,7 +59,10 @@ test_expect_success 'setup' '
 	test_commit files_subtree/master5 &&
 
 	git checkout -b to-rebase &&
-	git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+	git fast-export --no-data HEAD -- files_subtree/ |
+		sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" |
+		git fast-import --force --quiet &&
+	git reset --hard &&
 	git commit -m "Empty commit" --allow-empty
 '
 
-- 
2.22.0.19.ga495766805


  parent reply	other threads:[~2019-09-04 21:40 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-25 10:11 [PATCH 00/12] rebase -r: support merge strategies other than recursive Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 01/12] t3427: add a clarifying comment Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 02/12] t3427: simplify the `setup` test case significantly Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 03/12] t3427: move the `filter-branch` invocation into the `setup` case Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 04/12] t3427: condense the unnecessarily repetitive test cases into three Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 05/12] t3427: fix erroneous assumption Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 06/12] t3427: accommodate for the `rebase --merge` backend having been replaced Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 07/12] t3427: fix another incorrect assumption Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 08/12] t3427: mark two test cases as requiring support for `git rebase -p` Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 09/12] rebase -r: support merge strategies other than `recursive` Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 10/12] t/lib-rebase: prepare for testing `git rebase --rebase-merges` Johannes Schindelin via GitGitGadget
2019-07-26  7:43   ` brian m. carlson
2019-07-26 14:01     ` Johannes Schindelin
2019-07-26 21:08       ` brian m. carlson
2019-07-31 11:25         ` Johannes Schindelin
2019-07-25 10:11 ` [PATCH 11/12] t3418: test `rebase -r` with merge strategies Johannes Schindelin via GitGitGadget
2019-07-25 10:11 ` [PATCH 12/12] rebase -r: do not (re-)generate root commits with `--root` *and* `--onto` Johannes Schindelin via GitGitGadget
2019-07-25 17:10 ` [PATCH 00/12] rebase -r: support merge strategies other than recursive Junio C Hamano
2019-07-26  7:52 ` brian m. carlson
2019-07-31 15:18 ` [PATCH v2 00/16] " Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 01/16] Drop unused git-rebase--am.sh Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 02/16] t3400: stop referring to the scripted rebase Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 03/16] .gitignore: there is no longer a built-in `git-rebase--interactive` Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 04/16] sequencer: the `am` and `rebase--interactive` scripts are gone Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 05/16] rebase: fold git-rebase--common into the -p backend Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 07/16] t3427: simplify the `setup` test case significantly Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 06/16] t3427: add a clarifying comment Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 08/16] t3427: move the `filter-branch` invocation into the `setup` case Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 09/16] t3427: condense the unnecessarily repetitive test cases into three Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 10/16] t3427: fix erroneous assumption Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 11/16] t3427: accommodate for the `rebase --merge` backend having been replaced Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 12/16] t3427: fix another incorrect assumption Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 13/16] rebase -r: support merge strategies other than `recursive` Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 14/16] t/lib-rebase: prepare for testing `git rebase --rebase-merges` Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 15/16] t3418: test `rebase -r` with merge strategies Johannes Schindelin via GitGitGadget
2019-07-31 15:18   ` [PATCH v2 16/16] rebase -r: do not (re-)generate root commits with `--root` *and* `--onto` Johannes Schindelin via GitGitGadget
2019-09-04 21:40   ` Elijah Newren [this message]
2019-09-09 20:29     ` [PATCH v2 17/16] t3427: accelerate this test by using fast-export and fast-import Johannes Schindelin
2019-09-09 21:06       ` Junio C Hamano

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