From 348d4f2fc5d3c4f7ba47079b96676b4e2dd831fc Mon Sep 17 00:00:00 2001 From: Jeff King Date: Fri, 6 Nov 2015 01:24:29 -0500 Subject: filter-branch: skip index read/write when possible If the user specifies an index filter but not a tree filter, filter-branch cleverly avoids checking out the tree entirely. But we don't do the next level of optimization: if you have no index or tree filter, we do not need to read the index at all. This can greatly speed up cases where we are only changing the commit objects (e.g., cementing a graft into place). Here are numbers from the newly-added perf test: Test HEAD^ HEAD --------------------------------------------------------------- 7000.2: noop filter 13.81(4.95+0.83) 5.43(0.42+0.43) -60.7% Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- t/perf/p7000-filter-branch.sh | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100755 t/perf/p7000-filter-branch.sh (limited to 't/perf') diff --git a/t/perf/p7000-filter-branch.sh b/t/perf/p7000-filter-branch.sh new file mode 100755 index 0000000000..15ee5d1d53 --- /dev/null +++ b/t/perf/p7000-filter-branch.sh @@ -0,0 +1,19 @@ +#!/bin/sh + +test_description='performance of filter-branch' +. ./perf-lib.sh + +test_perf_default_repo +test_checkout_worktree + +test_expect_success 'mark bases for tests' ' + git tag -f tip && + git tag -f base HEAD~100 +' + +test_perf 'noop filter' ' + git checkout --detach tip && + git filter-branch -f base..HEAD +' + +test_done -- cgit v1.2.3