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