1 /* 2 * Copyright (c) 2014, 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 org.openjdk.bench.java.io; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.Mode; 28 import org.openjdk.jmh.annotations.OutputTimeUnit; 29 import org.openjdk.jmh.annotations.Scope; 30 import org.openjdk.jmh.annotations.Setup; 31 import org.openjdk.jmh.annotations.State; 32 import org.openjdk.jmh.infra.Blackhole; 33 34 import java.io.ObjectStreamClass; 35 import java.io.Serializable; 36 import java.util.LinkedList; 37 import java.util.concurrent.TimeUnit; 38 39 /** 40 * A micro benchmark used to measure the performance impact from multi threaded access to ObjectStreamClass. 41 */ 42 @BenchmarkMode(Mode.AverageTime) 43 @OutputTimeUnit(TimeUnit.NANOSECONDS) 44 @State(Scope.Thread) 45 public class ObjectStreamClasses { 46 47 public Class<?>[] classes; 48 49 @Setup setup()50 public void setup() { 51 LinkedList<Class> queue = new LinkedList<Class>(); 52 int i = 0; 53 while (true) { 54 // Loop until we get a ClassNotFoundException 55 // Maybe rewrite this considering the fact that there are 29 56 // inner classes available? 57 try { 58 Class clazz = Class.forName(ObjectStreamClasses.class.getName() + "$SerializableClass" + i++); 59 queue.add(clazz); 60 } catch (ClassNotFoundException e) { 61 break; 62 } 63 } 64 classes = new Class[queue.size()]; 65 66 // Make ObjectStreamClass load all classes into the static map 67 i = 0; 68 while (!queue.isEmpty()) { 69 classes[i] = (Class) queue.remove(); 70 i++; 71 } 72 } 73 74 /** 75 * Tests the static lookup function. Depending on JRE version the internal behavior is different but the general 76 * behavior is a synchronized call to some sort of static container. 77 */ 78 @Benchmark testLookup(Blackhole bh)79 public void testLookup(Blackhole bh) { 80 for (Class<?> klass : classes) { 81 bh.consume(ObjectStreamClass.lookup(klass)); 82 } 83 } 84 85 static class SerializableClass0 extends SerializableClass { 86 private static final long serialVersionUID = 1L; 87 } 88 89 static class SerializableClass1 extends SerializableClass { 90 private static final long serialVersionUID = 1L; 91 } 92 93 static class SerializableClass2 extends SerializableClass { 94 private static final long serialVersionUID = 1L; 95 } 96 97 static class SerializableClass3 extends SerializableClass { 98 private static final long serialVersionUID = 1L; 99 } 100 101 static class SerializableClass4 extends SerializableClass { 102 private static final long serialVersionUID = 1L; 103 } 104 105 static class SerializableClass5 extends SerializableClass { 106 private static final long serialVersionUID = 1L; 107 } 108 109 static class SerializableClass6 extends SerializableClass { 110 private static final long serialVersionUID = 1L; 111 } 112 113 static class SerializableClass7 extends SerializableClass { 114 private static final long serialVersionUID = 1L; 115 } 116 117 static class SerializableClass8 extends SerializableClass { 118 private static final long serialVersionUID = 1L; 119 } 120 121 static class SerializableClass9 extends SerializableClass { 122 private static final long serialVersionUID = 1L; 123 } 124 125 static class SerializableClass10 extends SerializableClass { 126 private static final long serialVersionUID = 1L; 127 } 128 129 static class SerializableClass11 extends SerializableClass { 130 private static final long serialVersionUID = 1L; 131 } 132 133 static class SerializableClass12 extends SerializableClass { 134 private static final long serialVersionUID = 1L; 135 } 136 137 static class SerializableClass13 extends SerializableClass { 138 private static final long serialVersionUID = 1L; 139 } 140 141 static class SerializableClass14 extends SerializableClass { 142 private static final long serialVersionUID = 1L; 143 } 144 145 static class SerializableClass15 extends SerializableClass { 146 private static final long serialVersionUID = 1L; 147 } 148 149 static class SerializableClass16 extends SerializableClass { 150 private static final long serialVersionUID = 1L; 151 } 152 153 static class SerializableClass17 extends SerializableClass { 154 private static final long serialVersionUID = 1L; 155 } 156 157 static class SerializableClass18 extends SerializableClass { 158 private static final long serialVersionUID = 1L; 159 } 160 161 static class SerializableClass19 extends SerializableClass { 162 private static final long serialVersionUID = 1L; 163 } 164 165 static class SerializableClass20 extends SerializableClass { 166 private static final long serialVersionUID = 1L; 167 } 168 169 static class SerializableClass21 extends SerializableClass { 170 private static final long serialVersionUID = 1L; 171 } 172 173 static class SerializableClass22 extends SerializableClass { 174 private static final long serialVersionUID = 1L; 175 } 176 177 static class SerializableClass23 extends SerializableClass { 178 private static final long serialVersionUID = 1L; 179 } 180 181 static class SerializableClass24 extends SerializableClass { 182 private static final long serialVersionUID = 1L; 183 } 184 185 static class SerializableClass25 extends SerializableClass { 186 private static final long serialVersionUID = 1L; 187 } 188 189 static class SerializableClass26 extends SerializableClass { 190 private static final long serialVersionUID = 1L; 191 } 192 193 static class SerializableClass27 extends SerializableClass { 194 private static final long serialVersionUID = 1L; 195 } 196 197 static class SerializableClass28 extends SerializableClass { 198 private static final long serialVersionUID = 1L; 199 } 200 201 static class SerializableClass29 extends SerializableClass { 202 private static final long serialVersionUID = 1L; 203 } 204 205 @SuppressWarnings("unused") 206 private static class SerializableClass implements Serializable { 207 208 private static final long serialVersionUID = 6107539118220989250L; 209 public Object objectField00 = new Object(); 210 public Object objectField01 = new Object(); 211 public Object objectField02 = new Object(); 212 public Object objectField03 = new Object(); 213 public Object objectField04 = new Object(); 214 public Object objectField05 = new Object(); 215 public Object objectField06 = new Object(); 216 public Object objectField07 = new Object(); 217 public Object objectField08 = new Object(); 218 public Object objectField09 = new Object(); 219 public Object objectField10 = new Object(); 220 public Object objectField11 = new Object(); 221 public Object objectField12 = new Object(); 222 public Object objectField13 = new Object(); 223 public Object objectField14 = new Object(); 224 public Object objectField15 = new Object(); 225 public Object objectField16 = new Object(); 226 public Object objectField17 = new Object(); 227 public Object objectField18 = new Object(); 228 public Object objectField19 = new Object(); 229 public Object objectField20 = new Object(); 230 public Object objectField21 = new Object(); 231 public Object objectField22 = new Object(); 232 public Object objectField23 = new Object(); 233 public Object objectField24 = new Object(); 234 public Object objectField25 = new Object(); 235 public Object objectField26 = new Object(); 236 public Object objectField27 = new Object(); 237 public Object objectField28 = new Object(); 238 public Object objectField29 = new Object(); 239 SerializableClass()240 SerializableClass() { 241 super(); 242 } 243 } 244 } 245