1 /*
   2  * Copyright (c) 2017, 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 TestRetainObjects
  26  * @summary Acceptance tests: collector can deal with retained objects
  27  * @key gc
  28  *
  29  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=passive    -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify TestRetainObjects
  30  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=passive    -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify TestRetainObjects
  31  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=passive    -XX:+ShenandoahDegeneratedGC                       TestRetainObjects
  32  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=passive    -XX:-ShenandoahDegeneratedGC                       TestRetainObjects
  33  *
  34  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot TestRetainObjects
  35  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahAllocFailureALot  TestRetainObjects
  36  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=aggressive                                  TestRetainObjects
  37  *
  38  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=adaptive   -XX:+ShenandoahVerify TestRetainObjects
  39  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=static     -XX:+ShenandoahVerify TestRetainObjects
  40  *
  41  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=adaptive   TestRetainObjects
  42  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=static     TestRetainObjects
  43  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g -XX:ShenandoahGCHeuristics=compact    TestRetainObjects
  44  *
  45  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g -Xmx1g                                       -XX:-UseTLAB TestRetainObjects
  46  */
  47 
  48 public class TestRetainObjects {
  49 
  50     static final int COUNT = 10_000_000;
  51     static final int WINDOW = 10_000;
  52 
  53     static final String[] reachable = new String[WINDOW];
  54 
  55     public static void main(String[] args) throws Exception {
  56         int rIdx = 0;
  57         for (int c = 0; c < COUNT; c++) {
  58             reachable[rIdx] = ("LargeString" + c);
  59             rIdx++;
  60             if (rIdx >= WINDOW) {
  61                 rIdx = 0;
  62             }
  63         }
  64     }
  65 
  66 }