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 TestHumongousMoves

    26  * @summary Check Shenandoah reacts on setting humongous moves correctly

    27  * @key gc

    28  * @requires vm.gc.Shenandoah & !vm.graal.enabled

    29  *

    30  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g

    31  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive

    32  *      -XX:-ShenandoahHumongousMoves

    33  *      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify

    34  *      TestHumongousMoves

    35  *

    36  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g

    37  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive

    38  *      -XX:+ShenandoahHumongousMoves

    39  *      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify

    40  *      TestHumongousMoves

    41  */

    42 

    43 import java.util.Random;

    44 

    45 public class TestHumongousMoves {

    46 

    47     static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation

    48 

    49     static volatile Object sink;

    50 

    51     public static void main(String[] args) throws Exception {

    52         final int min = 0;

    53         final int max = 384 * 1024;

    54         long count = TARGET_MB * 1024 * 1024 / (16 + 4 * (min + (max - min) / 2));

    55 

    56         Random r = new Random();

    57         for (long c = 0; c < count; c++) {

    58             sink = new int[min + r.nextInt(max - min)];

    59         }

    60     }

    61 

    62 }