1 /*
 2  * Copyright (c) 2016, 2018, Red Hat, Inc. 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  */
24 
25 /*
26  * @test
27  * @summary Shenandoah crashes with -XX:ObjectAlignmentInBytes=16
28  * @key randomness
29  * @requires vm.gc.Shenandoah
30  * @requires vm.bits == "64"
31  * @library /test/lib
32  *
33  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -Xint                   TestLargeObjectAlignment
34  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:-TieredCompilation  TestLargeObjectAlignment
35  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=1 TestLargeObjectAlignment
36  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=4 TestLargeObjectAlignment
37  */
38 
39 import java.util.ArrayList;
40 import java.util.List;
41 import java.util.Random;
42 import jdk.test.lib.Utils;
43 
44 public class TestLargeObjectAlignment {
45 
46     static final int SLABS_COUNT = Integer.getInteger("slabs", 10000);
47     static final int NODE_COUNT = Integer.getInteger("nodes", 10000);
48     static final long TIME_NS = 1000L * 1000L * Integer.getInteger("timeMs", 5000);
49 
50     static Object[] objects;
51 
52     public static void main(String[] args) throws Exception {
53         objects = new Object[SLABS_COUNT];
54 
55         long start = System.nanoTime();
56         Random rng = Utils.getRandomInstance();
57         while (System.nanoTime() - start < TIME_NS) {
58             objects[rng.nextInt(SLABS_COUNT)] = createSome();
59         }
60     }
61 
62     public static Object createSome() {
63         List<Integer> result = new ArrayList<Integer>();
64         for (int c = 0; c < NODE_COUNT; c++) {
65             result.add(new Integer(c));
66         }
67         return result;
68     }
69 
70 }