[PATCH v6 2/3] p0004-read-tree: perf test to time read-tree
From: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
---
t/perf/p0004-read-tree.sh | 117 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 117 insertions(+)
create mode 100755 t/perf/p0004-read-tree.sh
diff --git a/t/perf/p0004-read-tree.sh b/t/perf/p0004-read-tree.sh
new file mode 100755
index 0000000..d56020d
--- /dev/null
+++ b/t/perf/p0004-read-tree.sh
@@ -0,0 +1,117 @@
+#!/bin/sh
+
+test_description="Tests performance of read-tree"
+
+. ./perf-lib.sh
+
+test_perf_default_repo
+test_checkout_worktree
+
+## usage: dir depth width files
+make_paths () {
+ for f in $(seq $4)
+ do
+ echo $1/file$f
+ done;
+ if test $2 -gt 0;
+ then
+ for w in $(seq $3)
+ do
+ make_paths $1/dir$w $(($2 - 1)) $3 $4
+ done
+ fi
+ return 0
+}
+
+fill_index () {
+ make_paths $1 $2 $3 $4 |
+ sed "s/^/100644 $EMPTY_BLOB /" |
+ git update-index --index-info
+ return 0
+}
+
+br_base=xxx_base_xxx
+br_work1=xxx_work1_xxx
+br_work2=xxx_work2_xxx
+br_work3=xxx_work3_xxx
+
+new_dir=xxx_dir_xxx
+
+## (5, 10, 9) will create 999,999 files.
+## (4, 10, 9) will create 99,999 files.
+depth=5
+width=10
+files=9
+
+export br_base
+export br_work1
+export br_work2
+export br_work3
+
+export new_dir
+
+export depth
+export width
+export files
+
+## The number of files in the xxx_base_xxx branch.
+nr_base=$(git ls-files | wc -l)
+export nr_base
+
+## Inflate the index with thousands of empty files and commit it.
+## Turn on sparse-checkout so that we don't have to populate them
+## later when we start switching branches. Use reset --hard to
+## quickly checkout the new HEAD with minimum actual files.
+test_expect_success 'inflate the index' '
+ git reset --hard &&
+ git branch $br_base &&
+ git branch $br_work1 &&
+ git checkout $br_work1 &&
+ fill_index $new_dir $depth $width $files &&
+ git commit -m $br_work1 &&
+ echo $new_dir/file1 >.git/info/sparse-checkout &&
+ git config --local core.sparsecheckout 1 &&
+ git reset --hard
+'
+
+## The number of files in the xxx_work1_xxx branch.
+nr_work1=$(git ls-files | wc -l)
+export nr_work1
+
+test_perf "read-tree work1 ($nr_work1)" '
+ git read-tree -m $br_base $br_work1 -n
+'
+
+## Alternate between base and work branches several
+## times to measure a large change.
+test_perf "switch base work1 ($nr_base $nr_work1)" '
+ git checkout $br_base &&
+ git checkout $br_work1
+'
+
+## Create work2 by modifying 1 file in work1.
+## Create work3 as an alias of work2.
+test_expect_success 'setup work2' '
+ git branch $br_work2 &&
+ git checkout $br_work2 &&
+ echo x >$new_dir/file1 &&
+ git add $new_dir/file1 &&
+ git commit -m $br_work2 &&
+ git branch $br_work3
+'
+
+## Alternate between work1 and work2 several times
+## to measure a very small change.
+test_perf "switch work1 work2 ($nr_work1)" '
+ git checkout $br_work1 &&
+ git checkout $br_work2
+'
+
+## Alternate between branches work2 and work3 which
+## are aliases of the same commit.
+test_perf "switch commit aliases ($nr_work1)" '
+ git checkout $br_work3 &&
+ git checkout $br_work2
+'
+
+test_done
--
2.9.3