t/perf: add Scalar performance tests

Create 'p9210-scalar.sh' for testing Scalar performance and comparing
performance of Git operations in Scalar registrations and standard
repositories. Example results:

Test                                                   this tree
------------------------------------------------------------------------
9210.2: scalar clone                                   14.82(18.00+3.63)
9210.3: git clone                                      26.15(36.67+6.90)
9210.4: git status (scalar)                            0.04(0.01+0.01)
9210.5: git status (non-scalar)                        0.10(0.02+0.11)
9210.6: test_commit --append --no-tag A (scalar)       0.08(0.02+0.03)
9210.7: test_commit --append --no-tag A (non-scalar)   0.13(0.03+0.11)

Helped-by: Johannes Schindelin <[email protected]>
Signed-off-by: Victoria Dye <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: vdye

t/perf/p9210-scalar.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+test_description='test scalar performance'
+. ./perf-lib.sh
+
+test_perf_large_repo "$TRASH_DIRECTORY/to-clone"
+
+test_expect_success 'enable server-side partial clone' '
+	git -C to-clone config uploadpack.allowFilter true &&
+	git -C to-clone config uploadpack.allowAnySHA1InWant true
+'
+
+test_perf 'scalar clone' '
+	rm -rf scalar-clone &&
+	scalar clone "file://$(pwd)/to-clone" scalar-clone
+'
+
+test_perf 'git clone' '
+	rm -rf git-clone &&
+	git clone "file://$(pwd)/to-clone" git-clone
+'
+
+test_compare_perf () {
+	command=$1
+	shift
+	args=$*
+	test_perf "$command $args (scalar)" "
+		$command -C scalar-clone/src $args
+	"
+
+	test_perf "$command $args (non-scalar)" "
+		$command -C git-clone $args
+	"
+}
+
+test_compare_perf git status
+test_compare_perf test_commit --append --no-tag A
+
+test_done