1 /*
   2  * Copyright (c) 2016, 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 TestAllocHumongousFragment
  26  * @summary Make sure Shenandoah can recover from humongous allocation fragmentation
  27  * @key gc
  28  *
  29  * @run main/othervm -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive      -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify TestAllocHumongousFragment
  30  * @run main/othervm -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify TestAllocHumongousFragment
  31  * @run main/othervm -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive      -XX:+ShenandoahDegeneratedGC                       TestAllocHumongousFragment
  32  * @run main/othervm -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive      -XX:-ShenandoahDegeneratedGC                       TestAllocHumongousFragment
  33  *
  34  * @run main/othervm/timeout=240 -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot -XX:+ShenandoahVerify TestAllocHumongousFragment
  35  * @run main/othervm/timeout=240 -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahAllocFailureALot  -XX:+ShenandoahVerify TestAllocHumongousFragment
  36  * @run main/othervm/timeout=240 -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot                       TestAllocHumongousFragment
  37  * @run main/othervm/timeout=240 -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahAllocFailureALot                        TestAllocHumongousFragment
  38  *
  39  * @run main/othervm -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=adaptive     -XX:+ShenandoahVerify TestAllocHumongousFragment
  40  * @run main/othervm -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=static       -XX:+ShenandoahVerify TestAllocHumongousFragment
  41  *
  42  * @run main/othervm -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=adaptive     TestAllocHumongousFragment
  43  * @run main/othervm -verbose:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=static       TestAllocHumongousFragment
  44  */
  45 
  46 import java.util.*;
  47 import java.util.concurrent.*;
  48 
  49 public class TestAllocHumongousFragment {
  50 
  51     static final long TARGET_MB = Long.getLong("target", 30_000); // 30 Gb allocations
  52     static final long LIVE_MB   = Long.getLong("occupancy", 700); // 700 Mb alive
  53 
  54     static volatile Object sink;
  55 
  56     static List<int[]> objects;
  57 
  58     public static void main(String[] args) throws Exception {
  59         final int min = 128 * 1024;
  60         final int max = 16 * 1024 * 1024;
  61         final long count = TARGET_MB * 1024 * 1024 / (16 + 4 * (min + (max - min) / 2));
  62 
  63         objects = new ArrayList<>();
  64         long current = 0;
  65 
  66         Random r = new Random();
  67         for (long c = 0; c < count; c++) {
  68             while (current > LIVE_MB * 1024 * 1024) {
  69                 int idx = ThreadLocalRandom.current().nextInt(objects.size());
  70                 int[] remove = objects.remove(idx);
  71                 current -= remove.length * 4 + 16;
  72             }
  73 
  74             int[] newObj = new int[min + r.nextInt(max - min)];
  75             current += newObj.length * 4 + 16;
  76             objects.add(newObj);
  77             sink = new Object();
  78 
  79             System.out.println("Allocated: " + (current / 1024 / 1024) + " Mb");
  80         }
  81     }
  82 
  83 }