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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package org.openjdk.bench.vm.gc; 26 27 import org.openjdk.jmh.annotations.Benchmark; 28 import org.openjdk.jmh.annotations.BenchmarkMode; 29 import org.openjdk.jmh.annotations.Mode; 30 import org.openjdk.jmh.annotations.OutputTimeUnit; 31 import org.openjdk.jmh.annotations.Scope; 32 import org.openjdk.jmh.annotations.State; 33 import org.openjdk.jmh.infra.Blackhole; 34 35 import java.util.concurrent.TimeUnit; 36 37 @BenchmarkMode(Mode.AverageTime) 38 @OutputTimeUnit(TimeUnit.NANOSECONDS) 39 @State(Scope.Thread) 40 public class Alloc { 41 42 public static final int LENGTH = 400; 43 public static final int ARR_LEN = 100; 44 public int largeLen = 100; 45 public int smalllen = 6; 46 47 @Benchmark 48 public void testLargeConstArray(Blackhole bh) throws Exception { 49 int localArrlen = ARR_LEN; 50 for (int i = 0; i < LENGTH; i++) { 51 Object[] tmp = new Object[localArrlen]; 52 bh.consume(tmp); 53 } 54 } 55 56 @Benchmark 57 public void testLargeVariableArray(Blackhole bh) throws Exception { 58 int localArrlen = largeLen; 59 for (int i = 0; i < LENGTH; i++) { 60 Object[] tmp = new Object[localArrlen]; 61 bh.consume(tmp); 62 } 63 } 64 65 @Benchmark 66 public void testSmallConstArray(Blackhole bh) throws Exception { 67 int localArrlen = largeLen; 68 for (int i = 0; i < LENGTH; i++) { 69 Object[] tmp = new Object[localArrlen]; 70 bh.consume(tmp); 71 } 72 } 73 74 @Benchmark 75 public void testSmallObject(Blackhole bh) throws Exception { 76 FortyBytes localDummy = null; 77 for (int i = 0; i < LENGTH; i++) { 78 FortyBytes tmp = new FortyBytes(); 79 tmp.next = localDummy; 80 localDummy = tmp; 81 bh.consume(tmp); 82 } 83 } 84 85 @Benchmark 86 public void testSmallVariableArray(Blackhole bh) throws Exception { 87 int localArrlen = smalllen; 88 for (int i = 0; i < LENGTH; i++) { 89 Object[] tmp = new Object[localArrlen]; 90 bh.consume(tmp); 91 } 92 } 93 94 final class FortyBytes { 95 Object next; 96 int y, z, k, f, g, e, t; 97 } 98 99 }