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 LargeObjectAlignment
  26  * @summary Shenandoah crashes with -XX:ObjectAlignmentInBytes=16
  27  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -Xint                   LargeObjectAlignment
  28  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:-TieredCompilation  LargeObjectAlignment
  29  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=1 LargeObjectAlignment
  30  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=4 LargeObjectAlignment
  31  */
  32 
  33 import java.util.ArrayList;
  34 import java.util.List;
  35 import java.util.concurrent.ThreadLocalRandom;
  36 
  37 public class LargeObjectAlignment {
  38 
  39   static final int  SLABS_COUNT = Integer.getInteger("slabs",  10000);
  40   static final int  NODE_COUNT  = Integer.getInteger("nodes",  10000);
  41   static final long TIME_NS     = 1000L * 1000L * Integer.getInteger("timeMs", 5000);
  42 
  43   static Object[] objects;
  44 
  45   public static void main(String[] args) throws Exception {
  46     objects = new Object[SLABS_COUNT];
  47 
  48     long start = System.nanoTime();
  49     while (System.nanoTime() - start < TIME_NS) {
  50        objects[ThreadLocalRandom.current().nextInt(SLABS_COUNT)] = createSome();
  51     }
  52   }
  53 
  54   public static Object createSome() {
  55     List<Integer> result = new ArrayList<Integer>();
  56     for (int c = 0; c < NODE_COUNT; c++) {
  57       result.add(new Integer(c));
  58     }
  59     return result;
  60   }
  61 
  62 }