1 /* 2 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package micro.benchmarks; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.Scope; 27 import org.openjdk.jmh.annotations.State; 28 import org.openjdk.jmh.annotations.Warmup; 29 30 /** 31 * Benchmarks cost of non-contended synchronization. 32 */ 33 public class SimpleSyncBenchmark extends BenchmarkBase { 34 35 public static class Person { 36 public int age; 37 38 public Person(int age) { 39 this.age = age; 40 } 41 42 public synchronized int getAge() { 43 return age; 44 } 45 46 public synchronized void setAge(int age) { 47 this.age = age; 48 } 49 50 public synchronized void setAgeIfNonZero(int age) { 51 if (age != 0) { 52 this.age = age; 53 } 54 } 55 } 56 57 @State(Scope.Benchmark) 58 public static class ThreadState { 59 Person person = new Person(22); 60 int newAge = 45; 61 } 62 63 @Benchmark 64 @Warmup(iterations = 20) 65 public void setAgeCond(ThreadState state) { 66 Person person = state.person; 67 person.setAgeIfNonZero(state.newAge); 68 } 69 70 @Benchmark 71 @Warmup(iterations = 20) 72 public int getAge(ThreadState state) { 73 Person person = state.person; 74 return person.getAge(); 75 } 76 77 @Benchmark 78 @Warmup(iterations = 20) 79 public int getAndIncAge(ThreadState state) { 80 Person person = state.person; 81 int oldAge = person.getAge(); 82 person.setAge(oldAge + 1); 83 return oldAge; 84 } 85 }