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 }