1 /*
   2  * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 /*
  25  * @test TestLargeObjectAlignment
  26  * @summary Shenandoah crashes with -XX:ObjectAlignmentInBytes=16
  27  * @key gc
  28  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  29  *
  30  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -Xint                   TestLargeObjectAlignment
  31  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:-TieredCompilation  TestLargeObjectAlignment
  32  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=1 TestLargeObjectAlignment
  33  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=4 TestLargeObjectAlignment
  34  */
  35 
  36 import java.util.ArrayList;
  37 import java.util.List;
  38 import java.util.concurrent.ThreadLocalRandom;
  39 
  40 public class TestLargeObjectAlignment {
  41 
  42     static final int SLABS_COUNT = Integer.getInteger("slabs", 10000);
  43     static final int NODE_COUNT = Integer.getInteger("nodes", 10000);
  44     static final long TIME_NS = 1000L * 1000L * Integer.getInteger("timeMs", 5000);
  45 
  46     static Object[] objects;
  47 
  48     public static void main(String[] args) throws Exception {
  49         objects = new Object[SLABS_COUNT];
  50 
  51         long start = System.nanoTime();
  52         while (System.nanoTime() - start < TIME_NS) {
  53             objects[ThreadLocalRandom.current().nextInt(SLABS_COUNT)] = createSome();
  54         }
  55     }
  56 
  57     public static Object createSome() {
  58         List<Integer> result = new ArrayList<Integer>();
  59         for (int c = 0; c < NODE_COUNT; c++) {
  60             result.add(new Integer(c));
  61         }
  62         return result;
  63     }
  64 
  65 }