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

    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 }