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.vm.gc; 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.State; 31 import org.openjdk.jmh.infra.Blackhole; 32 33 import java.util.concurrent.TimeUnit; 34 35 @BenchmarkMode(Mode.AverageTime) 36 @OutputTimeUnit(TimeUnit.NANOSECONDS) 37 @State(Scope.Thread) 38 public class Alloc { 39 40 public static final int LENGTH = 400; 41 public static final int ARR_LEN = 100; 42 public int largeLen = 100; 43 public int smalllen = 6; 44 45 @Benchmark 46 public void testLargeConstArray(Blackhole bh) throws Exception { 47 int localArrlen = ARR_LEN; 48 for (int i = 0; i < LENGTH; i++) { 49 Object[] tmp = new Object[localArrlen]; 50 bh.consume(tmp); 51 } 52 } 53 54 @Benchmark 55 public void testLargeVariableArray(Blackhole bh) throws Exception { 56 int localArrlen = largeLen; 57 for (int i = 0; i < LENGTH; i++) { 58 Object[] tmp = new Object[localArrlen]; 59 bh.consume(tmp); 60 } 61 } 62 63 @Benchmark 64 public void testSmallConstArray(Blackhole bh) throws Exception { 65 int localArrlen = largeLen; 66 for (int i = 0; i < LENGTH; i++) { 67 Object[] tmp = new Object[localArrlen]; 68 bh.consume(tmp); 69 } 70 } 71 72 @Benchmark 73 public void testSmallObject(Blackhole bh) throws Exception { 74 FortyBytes localDummy = null; 75 for (int i = 0; i < LENGTH; i++) { 76 FortyBytes tmp = new FortyBytes(); 77 tmp.next = localDummy; 78 localDummy = tmp; 79 bh.consume(tmp); 80 } 81 } 82 83 @Benchmark 84 public void testSmallVariableArray(Blackhole bh) throws Exception { 85 int localArrlen = smalllen; 86 for (int i = 0; i < LENGTH; i++) { 87 Object[] tmp = new Object[localArrlen]; 88 bh.consume(tmp); 89 } 90 } 91 92 final class FortyBytes { 93 Object next; 94 int y, z, k, f, g, e, t; 95 } 96 97 }