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 */
23package micro.benchmarks;
24
25import java.util.Arrays;
26
27import org.openjdk.jmh.annotations.Benchmark;
28import org.openjdk.jmh.annotations.Level;
29import org.openjdk.jmh.annotations.OperationsPerInvocation;
30import org.openjdk.jmh.annotations.Scope;
31import org.openjdk.jmh.annotations.Setup;
32import org.openjdk.jmh.annotations.State;
33import org.openjdk.jmh.annotations.TearDown;
34
35import org.graalvm.compiler.microbenchmarks.graal.GraalBenchmark;
36
37@State(Scope.Thread)
38public 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}
111