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  * @requires vm.gc.Shenandoah

    29  *

    30  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive    -XX:-ShenandoahDegeneratedGC     -XX:+ShenandoahVerify TestAllocHumongousFragment

    31  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive    -XX:+ShenandoahDegeneratedGC     -XX:+ShenandoahVerify TestAllocHumongousFragment

    32  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive    -XX:-ShenandoahDegeneratedGC                           TestAllocHumongousFragment

    33  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive    -XX:+ShenandoahDegeneratedGC                           TestAllocHumongousFragment

    34  *

    35  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot -XX:+ShenandoahVerify TestAllocHumongousFragment

    36  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahAllocFailureALot  -XX:+ShenandoahVerify TestAllocHumongousFragment

    37  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot                       TestAllocHumongousFragment

    38  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahAllocFailureALot                        TestAllocHumongousFragment

    39  *

    40  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=adaptive     -XX:+ShenandoahVerify TestAllocHumongousFragment

    41  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=traversal    -XX:+ShenandoahVerify TestAllocHumongousFragment

    42  *

    43  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=adaptive     TestAllocHumongousFragment

    44  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=static       TestAllocHumongousFragment

    45  * @run main/othervm -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=traversal    TestAllocHumongousFragment

    46  */

    47 

    48 import java.util.*;

    49 import java.util.concurrent.*;

    50 

    51 public class TestAllocHumongousFragment {

    52 

    53     static final long TARGET_MB = Long.getLong("target", 30_000); // 30 Gb allocations

    54     static final long LIVE_MB   = Long.getLong("occupancy", 700); // 700 Mb alive

    55 

    56     static volatile Object sink;

    57 

    58     static List<int[]> objects;

    59 

    60     public static void main(String[] args) throws Exception {

    61         final int min = 128 * 1024;

    62         final int max = 16 * 1024 * 1024;

    63         final long count = TARGET_MB * 1024 * 1024 / (16 + 4 * (min + (max - min) / 2));

    64 

    65         objects = new ArrayList<>();

    66         long current = 0;

    67 

    68         Random r = new Random();

    69         for (long c = 0; c < count; c++) {

    70             while (current > LIVE_MB * 1024 * 1024) {

    71                 int idx = ThreadLocalRandom.current().nextInt(objects.size());

    72                 int[] remove = objects.remove(idx);

    73                 current -= remove.length * 4 + 16;

    74             }

    75 

    76             int[] newObj = new int[min + r.nextInt(max - min)];

    77             current += newObj.length * 4 + 16;

    78             objects.add(newObj);

    79             sink = new Object();

    80 

    81             System.out.println("Allocated: " + (current / 1024 / 1024) + " Mb");

    82         }

    83     }

    84 

    85 }