1 /*

     2  * Copyright (c) 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 TestPauseNotifications

    26  * @summary Check that MX notifications are reported for all cycles

    27  * @key gc

    28  * @requires vm.gc.Shenandoah

    29  *

    30  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=passive       -XX:+ShenandoahDegeneratedGC TestPauseNotifications

    31  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=passive       -XX:-ShenandoahDegeneratedGC TestPauseNotifications

    32  *

    33  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive    TestPauseNotifications

    34  *

    35  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive      TestPauseNotifications

    36  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static        TestPauseNotifications

    37  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact       TestPauseNotifications

    38  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=traversal     TestPauseNotifications

    39  */

    40 

    41 import java.util.*;

    42 import java.util.concurrent.atomic.*;

    43 import javax.management.*;

    44 import java.lang.management.*;

    45 import javax.management.openmbean.*;

    46 

    47 import com.sun.management.GarbageCollectionNotificationInfo;

    48 

    49 public class TestPauseNotifications {

    50 

    51     static final long HEAP_MB = 128;                           // adjust for test configuration above

    52     static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation

    53 

    54     static volatile Object sink;

    55 

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

    57         final AtomicLong pausesDuration = new AtomicLong();

    58         final AtomicLong cyclesDuration = new AtomicLong();

    59 

    60         NotificationListener listener = new NotificationListener() {

    61             @Override

    62             public void handleNotification(Notification n, Object o) {

    63                 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {

    64                     GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());

    65 

    66                     System.out.println(info.getGcInfo().toString());

    67                     System.out.println(info.getGcName());

    68                     System.out.println();

    69 

    70                     long d = info.getGcInfo().getDuration();

    71 

    72                     String name = info.getGcName();

    73                     if (name.contains("Shenandoah")) {

    74                         if (name.equals("Shenandoah Pauses")) {

    75                             pausesDuration.addAndGet(d);

    76                         } else if (name.equals("Shenandoah Cycles")) {

    77                             cyclesDuration.addAndGet(d);

    78                         } else {

    79                             throw new IllegalStateException("Unknown name: " + name);

    80                         }

    81                     }

    82                 }

    83             }

    84         };

    85 

    86         for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {

    87             ((NotificationEmitter) bean).addNotificationListener(listener, null, null);

    88         }

    89 

    90         final int size = 100_000;

    91         long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);

    92 

    93         for (int c = 0; c < count; c++) {

    94             sink = new int[size];

    95         }

    96 

    97         Thread.sleep(1000);

    98 

    99         long pausesActual = pausesDuration.get();

   100         long cyclesActual = cyclesDuration.get();

   101 

   102         long minExpected = 1;

   103         long maxExpected = Long.MAX_VALUE;

   104 

   105         {

   106             String msg = "Pauses expected = [" + minExpected + "; " + maxExpected + "], actual = " + pausesActual;

   107             if (minExpected < pausesActual && pausesActual < maxExpected) {

   108                 System.out.println(msg);

   109             } else {

   110                 throw new IllegalStateException(msg);

   111             }

   112         }

   113 

   114         {

   115             String msg = "Cycles expected = [" + minExpected + "; " + maxExpected + "], actual = " + cyclesActual;

   116             if (minExpected < cyclesActual && cyclesActual < maxExpected) {

   117                 System.out.println(msg);

   118             } else {

   119                 throw new IllegalStateException(msg);

   120             }

   121         }

   122 

   123         {

   124             String msg = "Cycle duration (" + cyclesActual + "), pause duration (" + pausesActual + ")";

   125             if (pausesActual < cyclesActual) {

   126                 System.out.println(msg);

   127             } else {

   128                 throw new IllegalStateException(msg);

   129             }

   130         }

   131     }

   132 }