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 {
stopwatch(int reps)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 
manual(int reps)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 }
52