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