1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 /*
  26  * @test TestRegionSampling
  27  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  28  *
  29  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
  30  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  31  *      -XX:+ShenandoahDegeneratedGC
  32  *      TestRegionSampling
  33  *
  34  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
  35  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  36  *      -XX:-ShenandoahDegeneratedGC
  37  *      TestRegionSampling
  38  */
  39 
  40 /*
  41  * @test TestRegionSampling
  42  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  43  *
  44  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
  45  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
  46  *      TestRegionSampling
  47  *
  48  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
  49  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
  50  *      TestRegionSampling
  51  *
  52  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
  53  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
  54  *      TestRegionSampling
  55  *
  56  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
  57  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
  58  *      TestRegionSampling
  59  */
  60 
  61 public class TestRegionSampling {
  62 
  63     static final long TARGET_MB = Long.getLong("target", 2_000); // 2 Gb allocation
  64 
  65     static volatile Object sink;
  66 
  67     public static void main(String[] args) throws Exception {
  68         long count = TARGET_MB * 1024 * 1024 / 16;
  69         for (long c = 0; c < count; c++) {
  70             sink = new Object();
  71         }
  72     }
  73 
  74 }