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