1 files changed, 43 insertions, 0 deletions
diff --git a/t/perf/p0100-globbing.sh b/t/perf/p0100-globbing.sh
new file mode 100755
index 0000000..439e9c8
--- /dev/null
+++ b/t/perf/p0100-globbing.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+test_description="Tests pathological globbing performance
+
+Shows how Git's globbing performance performs when given the sort of
+pathological patterns described in at https://research.swtch.com/glob
+"
+
+. ./perf-lib.sh
+
+test_globs_big='10 25 50 75 100'
+test_globs_small='1 2 3 4 5 6'
+
+test_perf_fresh_repo
+
+test_expect_success 'setup' '
+	for i in $(test_seq 1 100)
+	do
+		printf "a" >>refname &&
+		for j in $(test_seq 1 $i)
+		do
+			printf "a*" >>refglob.$i || return 1
+		done &&
+		echo b >>refglob.$i || return 1
+	done &&
+	test_commit test $(cat refname).t "" $(cat refname).t
+'
+
+for i in $test_globs_small
+do
+	test_perf "refglob((a*)^nb) against tag (a^100).t; n = $i" '
+		git for-each-ref "refs/tags/$(cat refglob.'$i')b"
+	'
+done
+
+for i in $test_globs_small
+do
+	test_perf "fileglob((a*)^nb) against file (a^100).t; n = $i" '
+		git ls-files "$(cat refglob.'$i')b"
+	'
+done
+
+test_done