Merge pull request #328 from nico/canonperf

add canon_perftest

configure.py

@@ -323,8 +323,12 @@ def binary(name):
 build_log_perftest = n.build(binary('build_log_perftest'), 'link', objs,
                              implicit=ninja_lib,
                              variables=[('libs', libs)])
+objs = cxx('canon_perftest')
+canon_perftest = n.build(binary('canon_perftest'), 'link', objs,
+                         implicit=ninja_lib,
+                         variables=[('libs', libs)])
 n.newline()
-all_targets += parser_perftest + build_log_perftest
+all_targets += parser_perftest + build_log_perftest + canon_perftest
 
 n.comment('Generate a graph using the "graph" tool.')
 n.rule('gendot',

src/canon_perftest.cc

@@ -0,0 +1,38 @@
+#include "util.h"
+
+const char kPath[] =
+    "../../third_party/WebKit/Source/WebCore/"
+    "platform/leveldb/LevelDBWriteBatch.cpp";
+
+int main() {
+  vector<int> times;
+  string err;
+
+  char buf[200];
+  int len = strlen(kPath);
+  strcpy(buf, kPath);
+
+  for (int j = 0; j < 5; ++j) {
+    const int kNumRepetitions = 2000000;
+    int64_t start = GetTimeMillis();
+    for (int i = 0; i < kNumRepetitions; ++i) {
+      CanonicalizePath(buf, &len, &err);
+    }
+    int delta = (int)(GetTimeMillis() - start);
+    times.push_back(delta);
+  }
+
+  int min = times[0];
+  int max = times[0];
+  float total = 0;
+  for (size_t i = 0; i < times.size(); ++i) {
+    total += times[i];
+    if (times[i] < min)
+      min = times[i];
+    else if (times[i] > max)
+      max = times[i];
+  }
+
+  printf("min %dms  max %dms  avg %.1fms\n",
+         min, max, total / times.size());
+}