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.java.lang; 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.Param; 32 import org.openjdk.jmh.annotations.Scope; 33 import org.openjdk.jmh.annotations.Setup; 34 import org.openjdk.jmh.annotations.State; 35 36 import java.util.concurrent.TimeUnit; 37 38 /** 39 * Benchmark measuring aligned System.arraycopy. 40 */ 41 @BenchmarkMode(Mode.AverageTime) 42 @OutputTimeUnit(TimeUnit.NANOSECONDS) 43 @State(Scope.Thread) 44 public class ArrayCopyAligned { 45 46 @Param({"1", "3", "5", "10", "20", "70", "150", "300", "600", "1200"}) 47 int length; 48 49 int fromPos, toPos; 50 byte[] fromByteArr, toByteArr; 51 char[] fromCharArr, toCharArr; 52 int[] fromIntArr, toIntArr; 53 long[] fromLongArr, toLongArr; 54 55 @Setup 56 public void setup() { 57 // Both positions aligned 58 fromPos = 8; 59 toPos = 8; 60 61 fromByteArr = new byte[1210]; 62 toByteArr = new byte[1210]; 63 fromCharArr = new char[1210]; 64 toCharArr = new char[1210]; 65 fromIntArr = new int[1210]; 66 toIntArr = new int[1210]; 67 fromLongArr = new long[1210]; 68 toLongArr = new long[1210]; 69 } 70 71 @Benchmark 72 public void testByte() { 73 System.arraycopy(fromByteArr, fromPos, toByteArr, toPos, length); 74 } 75 76 @Benchmark 77 public void testChar() { 78 System.arraycopy(fromCharArr, fromPos, toCharArr, toPos, length); 79 } 80 81 @Benchmark 82 public void testInt() { 83 System.arraycopy(fromIntArr, fromPos, toIntArr, toPos, length); 84 } 85 86 @Benchmark 87 public void testLong() { 88 System.arraycopy(fromLongArr, fromPos, toLongArr, toPos, length); 89 } 90 91 }