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 id=passive
 27  * @summary Acceptance tests: collector can deal with retained objects
 28  * @requires vm.gc.Shenandoah
 29  *
 30  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 31  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
 32  *      -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify
 33  *      TestRetainObjects
 34  *
 35  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 36  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
 37  *      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify
 38  *      TestRetainObjects
 39  *
 40  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 41  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
 42  *      -XX:+ShenandoahDegeneratedGC
 43  *      TestRetainObjects
 44  *
 45  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 46  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
 47  *      -XX:-ShenandoahDegeneratedGC
 48  *      TestRetainObjects
 49  */
 50 
 51 /*
 52  * @test id=aggressive
 53  * @summary Acceptance tests: collector can deal with retained objects
 54  * @requires vm.gc.Shenandoah
 55  *
 56  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 57  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
 58  *      -XX:+ShenandoahOOMDuringEvacALot
 59  *      TestRetainObjects
 60  *
 61  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 62  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
 63  *      -XX:+ShenandoahAllocFailureALot
 64  *      TestRetainObjects
 65  *
 66  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 67  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
 68  *      TestRetainObjects
 69  */
 70 
 71 /*
 72  * @test id=adaptive
 73  * @summary Acceptance tests: collector can deal with retained objects
 74  * @requires vm.gc.Shenandoah
 75  *
 76  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 77  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
 78  *      -XX:+ShenandoahVerify
 79  *      TestRetainObjects
 80  *
 81  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 82  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
 83  *      TestRetainObjects
 84  */
 85 
 86 /*
 87  * @test id=static
 88  * @summary Acceptance tests: collector can deal with retained objects
 89  * @requires vm.gc.Shenandoah
 90  *
 91  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 92  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
 93  *      TestRetainObjects
 94  */
 95 
 96 /*
 97  * @test id=compact
 98  * @summary Acceptance tests: collector can deal with retained objects
 99  * @requires vm.gc.Shenandoah
100  *
101  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
102  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
103  *      TestRetainObjects
104  */
105 
106 /*
107  * @test id=no-tlab
108  * @summary Acceptance tests: collector can deal with retained objects
109  * @requires vm.gc.Shenandoah
110  *
111  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
112  *      -XX:+UseShenandoahGC
113  *      -XX:-UseTLAB -XX:+ShenandoahVerify
114  *      TestRetainObjects
115  */
116 
117 public class TestRetainObjects {
118 
119     static final int COUNT = 10_000_000;
120     static final int WINDOW = 10_000;
121 
122     static final String[] reachable = new String[WINDOW];
123 
124     public static void main(String[] args) throws Exception {
125         int rIdx = 0;
126         for (int c = 0; c < COUNT; c++) {
127             reachable[rIdx] = ("LargeString" + c);
128             rIdx++;
129             if (rIdx >= WINDOW) {
130                 rIdx = 0;
131             }
132         }
133     }
134 
135 }