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 }