1 /*
  2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
  3  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
  4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  5  *
  6  * This code is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License version 2 only, as
  8  * published by the Free Software Foundation.
  9  *
 10  * This code is distributed in the hope that it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 13  * version 2 for more details (a copy is included in the LICENSE file that
 14  * accompanied this code).
 15  *
 16  * You should have received a copy of the GNU General Public License version
 17  * 2 along with this work; if not, write to the Free Software Foundation,
 18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 19  *
 20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 21  * or visit www.oracle.com if you need additional information or have any
 22  * questions.
 23  *
 24  */
 25 
 26 /*
 27  * @test id=passive
 28  * @requires vm.gc.Shenandoah
 29  *
 30  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
 31  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
 32  *      -XX:+ShenandoahDegeneratedGC
 33  *      TestRegionSampling
 34  *
 35  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
 36  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
 37  *      -XX:-ShenandoahDegeneratedGC
 38  *      TestRegionSampling
 39  */
 40 
 41 /*
 42  * @test id=adaptive
 43  * @requires vm.gc.Shenandoah
 44  *
 45  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
 46  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
 47  *      TestRegionSampling
 48  */
 49 
 50 /*
 51  * @test id=generational
 52  * @requires vm.gc.Shenandoah
 53  *
 54  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
 55  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive -XX:ShenandoahGCMode=generational
 56  *      TestRegionSampling
 57  */
 58 
 59 /*
 60  * @test id=static
 61  * @requires vm.gc.Shenandoah
 62  *
 63  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
 64  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
 65  *      TestRegionSampling
 66  */
 67 
 68 /*
 69  * @test id=compact
 70  * @requires vm.gc.Shenandoah
 71  *
 72  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
 73  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
 74  *      TestRegionSampling
 75  */
 76 
 77 /*
 78  * @test id=aggressive
 79  * @requires vm.gc.Shenandoah
 80  *
 81  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
 82  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
 83  *      TestRegionSampling
 84  */
 85 
 86 /*
 87  * @test id=iu-aggressive
 88  * @requires vm.gc.Shenandoah
 89  *
 90  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
 91  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
 92  *      TestRegionSampling
 93  */
 94 
 95 /*
 96  * @test id=iu
 97  * @requires vm.gc.Shenandoah
 98  *
 99  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
100  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
101  *      TestRegionSampling
102  *
103  */
104 
105 public class TestRegionSampling {
106 
107     static final long TARGET_MB = Long.getLong("target", 2_000); // 2 Gb allocation
108 
109     static volatile Object sink;
110 
111     public static void main(String[] args) throws Exception {
112         long count = TARGET_MB * 1024 * 1024 / 16;
113         for (long c = 0; c < count; c++) {
114             sink = new Object();
115         }
116     }
117 
118 }