1 /*
   2  * Copyright (c) 2016, 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 AllocHumongousFragment
  26  * @summary Make sure Shenandoah can recover from humongous allocation fragmentation
  27  *
  28  * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive      -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify AllocHumongousFragment
  29  * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify AllocHumongousFragment
  30  * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive      -XX:+ShenandoahDegeneratedGC                       AllocHumongousFragment
  31  * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive      -XX:-ShenandoahDegeneratedGC                       AllocHumongousFragment
  32  *
  33  * @run main/othervm/timeout=240 -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot -XX:+ShenandoahVerify AllocHumongousFragment
  34  * @run main/othervm/timeout=240 -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahAllocFailureALot  -XX:+ShenandoahVerify AllocHumongousFragment
  35  * @run main/othervm/timeout=240 -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot                       AllocHumongousFragment
  36  * @run main/othervm/timeout=240 -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahAllocFailureALot                        AllocHumongousFragment
  37  *
  38  * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=adaptive     -XX:+ShenandoahVerify AllocHumongousFragment
  39  * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=static       -XX:+ShenandoahVerify AllocHumongousFragment
  40  *
  41  * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=adaptive     AllocHumongousFragment
  42  * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=static       AllocHumongousFragment
  43  */
  44 
  45 import java.util.*;
  46 import java.util.concurrent.*;
  47 
  48 public class AllocHumongousFragment {
  49 
  50   static final long TARGET_MB = Long.getLong("target",  30_000); // 30 Gb allocations
  51   static final long LIVE_MB   = Long.getLong("occupancy",  700); // 700 Mb alive
  52 
  53   static volatile Object sink;
  54 
  55   static List<int[]> objects;
  56 
  57   public static void main(String[] args) throws Exception {
  58     final int min =     128*1024;
  59     final int max = 16*1024*1024;
  60     final long count = TARGET_MB * 1024 * 1024 / (16 + 4*(min + (max-min)/2));
  61 
  62     objects = new ArrayList<>();
  63     long current = 0;
  64 
  65     Random r = new Random();
  66     for (long c = 0; c < count; c++) {
  67       while (current > LIVE_MB * 1024 * 1024) {
  68         int idx = ThreadLocalRandom.current().nextInt(objects.size());
  69         int[] remove = objects.remove(idx);
  70         current -= remove.length * 4 + 16;
  71       }
  72 
  73       int[] newObj = new int[min + r.nextInt(max-min)];
  74       current += newObj.length * 4 + 16;
  75       objects.add(newObj);
  76       sink = new Object();
  77 
  78       System.out.println("Allocated: " + (current / 1024 / 1024) + " Mb");
  79     }
  80   }
  81 
  82 }