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read-cache: add simple performance test

Add the helper test-read-cache, which can be used to call read_cache and
discard_cache in a loop as well as a performance check based on it.

Signed-off-by: René Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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René Scharfe authored and gitster committed Jun 9, 2013
1 parent edca415 commit 1ecb5ff141f6e54727c746446b52af51016e662c
Showing with 29 additions and 0 deletions.
  1. +1 −0 .gitignore
  2. +1 −0 Makefile
  3. +14 −0 t/perf/p0002-read-cache.sh
  4. +13 −0 test-read-cache.c
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@@ -190,6 +190,7 @@
/test-mktemp
/test-parse-options
/test-path-utils
+/test-read-cache
/test-regex
/test-revision-walking
/test-run-command
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@@ -558,6 +558,7 @@ TEST_PROGRAMS_NEED_X += test-mergesort
TEST_PROGRAMS_NEED_X += test-mktemp
TEST_PROGRAMS_NEED_X += test-parse-options
TEST_PROGRAMS_NEED_X += test-path-utils
+TEST_PROGRAMS_NEED_X += test-read-cache
TEST_PROGRAMS_NEED_X += test-regex
TEST_PROGRAMS_NEED_X += test-revision-walking
TEST_PROGRAMS_NEED_X += test-run-command
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@@ -0,0 +1,14 @@
+#!/bin/sh
+
+test_description="Tests performance of reading the index"
+
+. ./perf-lib.sh
+
+test_perf_default_repo
+
+count=1000
+test_perf "read_cache/discard_cache $count times" "
+ test-read-cache $count
+"
+
+test_done
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@@ -0,0 +1,13 @@
+#include "cache.h"
+
+int main (int argc, char **argv)
+{
+ int i, cnt = 1;
+ if (argc == 2)
+ cnt = strtol(argv[1], NULL, 0);
+ for (i = 0; i < cnt; i++) {
+ read_cache();
+ discard_cache();
+ }
+ return 0;
+}

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