1 /* 2 * Copyright Amazon.com Inc. 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.vm.compiler.pea; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.CompilerControl; 28 import org.openjdk.jmh.annotations.Fork; 29 import org.openjdk.jmh.annotations.Measurement; 30 import org.openjdk.jmh.annotations.Mode; 31 import org.openjdk.jmh.annotations.Param; 32 import org.openjdk.jmh.annotations.Scope; 33 import org.openjdk.jmh.annotations.State; 34 import org.openjdk.jmh.annotations.OutputTimeUnit; 35 import org.openjdk.jmh.annotations.Warmup; 36 37 import java.util.concurrent.TimeUnit; 38 39 @BenchmarkMode(Mode.AverageTime) 40 @OutputTimeUnit(TimeUnit.NANOSECONDS) 41 @Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS) 42 @Measurement(iterations = 20, time = 1, timeUnit = TimeUnit.SECONDS) 43 @State(Scope.Benchmark) 44 @Fork(value = 3) 45 public class Simple { 46 @Param({"1", "2", "4", "8"}) 47 int odd; 48 private Object _cache; 49 50 void example1(boolean cond) { 51 Object x = new Object(); 52 if (cond) { 53 _cache = x; 54 } 55 } 56 57 @Benchmark 58 public void example1() { 59 for (int i = 0; i< 1024; ++i) { 60 boolean cond = (i % odd) == 0; 61 example1(cond); 62 } 63 } 64 @CompilerControl(CompilerControl.Mode.DONT_INLINE) 65 static void escaped_as_argument(Object x) {} 66 67 // Ivanov suggests making this happen first. 68 // we don't need to create JVMState for the cloning Allocate. 69 @Benchmark 70 public void example1_ArgEscape() { 71 for (int i = 0; i< 1024; ++i) { 72 boolean cond = (i % odd) == 0; 73 Object x = new Object(); 74 75 if (cond) { 76 escaped_as_argument(x); 77 } 78 } 79 } 80 }