1 /*
   2  * Copyright (c) 2015, 2015, 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 micro.benchmarks;
  24 
  25 import java.util.Arrays;
  26 
  27 import org.openjdk.jmh.annotations.Benchmark;
  28 import org.openjdk.jmh.annotations.Level;
  29 import org.openjdk.jmh.annotations.OperationsPerInvocation;
  30 import org.openjdk.jmh.annotations.Scope;
  31 import org.openjdk.jmh.annotations.Setup;
  32 import org.openjdk.jmh.annotations.State;
  33 import org.openjdk.jmh.annotations.TearDown;
  34 
  35 import org.graalvm.compiler.microbenchmarks.graal.GraalBenchmark;
  36 
  37 @State(Scope.Thread)
  38 public class ArrayDuplicationBenchmark extends GraalBenchmark {
  39 
  40     /** How large should the test-arrays be. */
  41     private static final int TESTSIZE = 300;
  42 
  43     private Object[][] testObjectArray;
  44 
  45     private Object[] dummy;
  46 
  47     @Setup
  48     public void setup() {
  49         testObjectArray = new Object[TESTSIZE][];
  50         for (int i = 0; i < TESTSIZE; i++) {
  51             testObjectArray[i] = new Object[20];
  52         }
  53     }
  54 
  55     @Setup(Level.Iteration)
  56     public void iterationSetup() {
  57         dummy = new Object[TESTSIZE * 3];
  58     }
  59 
  60     @TearDown(Level.Iteration)
  61     public void iterationTearDown() {
  62         dummy = null;
  63     }
  64 
  65     @Benchmark
  66     @OperationsPerInvocation(TESTSIZE)
  67     public Object[] normalArraycopy() {
  68         int j = 0;
  69         for (int i = 0; i < TESTSIZE; i++) {
  70             dummy[j++] = normalArraycopy(testObjectArray[i]);
  71         }
  72         return dummy;
  73     }
  74 
  75     public Object[] normalArraycopy(Object[] cache) {
  76         Object[] result = new Object[cache.length];
  77         System.arraycopy(cache, 0, result, 0, result.length);
  78         return result;
  79     }
  80 
  81     @Benchmark
  82     @OperationsPerInvocation(TESTSIZE)
  83     public Object[] arraysCopyOf() {
  84         int j = 0;
  85         for (int i = 0; i < TESTSIZE; i++) {
  86             dummy[j++] = arraysCopyOf(testObjectArray[i]);
  87         }
  88         return dummy;
  89     }
  90 
  91     public Object[] arraysCopyOf(Object[] cache) {
  92         return Arrays.copyOf(cache, cache.length);
  93     }
  94 
  95     @Benchmark
  96     @OperationsPerInvocation(TESTSIZE)
  97     public Object[] cloneObjectArray() {
  98         int j = 0;
  99         for (int i = 0; i < TESTSIZE; i++) {
 100             dummy[j++] = arraysClone(testObjectArray[i]);
 101         }
 102         return dummy;
 103     }
 104 
 105     @SuppressWarnings("cast")
 106     public Object[] arraysClone(Object[] cache) {
 107         return (Object[]) cache.clone();
 108     }
 109 
 110 }