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.lang; 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.Param; 30 import org.openjdk.jmh.annotations.Scope; 31 import org.openjdk.jmh.annotations.Setup; 32 import org.openjdk.jmh.annotations.State; 33 34 import java.util.concurrent.TimeUnit; 35 36 /** 37 * Benchmark measuring aligned System.arraycopy. 38 */ 39 @BenchmarkMode(Mode.AverageTime) 40 @OutputTimeUnit(TimeUnit.NANOSECONDS) 41 @State(Scope.Thread) 42 public class ArrayCopyAligned { 43 44 @Param({"1", "3", "5", "10", "20", "70", "150", "300", "600", "1200"}) 45 int length; 46 47 int fromPos, toPos; 48 byte[] fromByteArr, toByteArr; 49 char[] fromCharArr, toCharArr; 50 int[] fromIntArr, toIntArr; 51 long[] fromLongArr, toLongArr; 52 53 @Setup setup()54 public void setup() { 55 // Both positions aligned 56 fromPos = 8; 57 toPos = 8; 58 59 fromByteArr = new byte[1210]; 60 toByteArr = new byte[1210]; 61 fromCharArr = new char[1210]; 62 toCharArr = new char[1210]; 63 fromIntArr = new int[1210]; 64 toIntArr = new int[1210]; 65 fromLongArr = new long[1210]; 66 toLongArr = new long[1210]; 67 } 68 69 @Benchmark testByte()70 public void testByte() { 71 System.arraycopy(fromByteArr, fromPos, toByteArr, toPos, length); 72 } 73 74 @Benchmark testChar()75 public void testChar() { 76 System.arraycopy(fromCharArr, fromPos, toCharArr, toPos, length); 77 } 78 79 @Benchmark testInt()80 public void testInt() { 81 System.arraycopy(fromIntArr, fromPos, toIntArr, toPos, length); 82 } 83 84 @Benchmark testLong()85 public void testLong() { 86 System.arraycopy(fromLongArr, fromPos, toLongArr, toPos, length); 87 } 88 89 } 90