1 /*
2 * Copyright (C) 2008 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package com.google.common.base;
18
19 import com.google.caliper.Benchmark;
20 import com.google.common.base.Stopwatch;
21
22 import java.util.concurrent.TimeUnit;
23
24 /**
25 * Simple benchmark: create, start, read. This does not currently report the
26 * most useful result because it's ambiguous to what extent the stopwatch
27 * benchmark is being affected by GC.
28 *
29 * @author Kevin Bourrillion
30 */
31 public class StopwatchBenchmark {
32 @Benchmark long stopwatch(int reps) {
33 long total = 0;
34 for (int i = 0; i < reps; i++) {
35 Stopwatch s = Stopwatch.createStarted();
36 // here is where you would do something
37 total += s.elapsed(TimeUnit.NANOSECONDS);
38 }
39 return total;
40 }
41
42 @Benchmark long manual(int reps) {
43 long total = 0;
44 for (int i = 0; i < reps; i++) {
45 long start = System.nanoTime();
46 // here is where you would do something
47 total += (System.nanoTime() - start);
48 }
49 return total;
50 }
51 }