canon_perftest.cc

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// Copyright 2012 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#include <stdio.h>
#include <string.h>
 
#include "util.h"
#include "metrics.h"
 
using namespace std;
 
const char kPath[] =
    "../../third_party/WebKit/Source/WebCore/"
    "platform/leveldb/LevelDBWriteBatch.cpp";
 
int main() {
  vector<int> times;
 
  char buf[200];
  size_t len = strlen(kPath);
  strcpy(buf, kPath);
 
  for (int j = 0; j < 5; ++j) {
    const int kNumRepetitions = 2000000;
    int64_t start = GetTimeMillis();
    uint64_t slash_bits;
    for (int i = 0; i < kNumRepetitions; ++i) {
      CanonicalizePath(buf, &len, &slash_bits);
    }
    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());
}