1 /*
   2  * Copyright (c) 2018, 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 PauseNotifications
  26  * @summary Check that MX notifications are reported for all cycles
  27  *
  28  * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions                                          PauseNotifications
  29  * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=passive       PauseNotifications
  30  * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=adaptive      PauseNotifications
  31  * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=static        PauseNotifications
  32  * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=compact       PauseNotifications
  33  * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive    PauseNotifications
  34  */
  35 
  36 import java.util.*;
  37 import java.util.concurrent.atomic.*;
  38 import javax.management.*;
  39 import java.lang.management.*;
  40 import javax.management.openmbean.*;
  41 import com.sun.management.GarbageCollectionNotificationInfo;
  42 
  43 public class PauseNotifications {
  44 
  45   static final long HEAP_MB   = 128;                           // adjust for test configuration above
  46   static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation
  47 
  48   static volatile Object sink;
  49 
  50   public static void main(String[] args) throws Exception {
  51     final AtomicLong pausesDuration = new AtomicLong();
  52     final AtomicLong cyclesDuration = new AtomicLong();
  53 
  54     NotificationListener listener = new NotificationListener() {
  55       @Override
  56       public void handleNotification(Notification n, Object o) {
  57         if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
  58           GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData)n.getUserData());
  59 
  60           long d = info.getGcInfo().getDuration();
  61 
  62           String name = info.getGcName();
  63           if (name.contains("Shenandoah")) {
  64             if (name.equals("Shenandoah Pauses")) {
  65               pausesDuration.addAndGet(d);
  66             } else if (name.equals("Shenandoah Cycles")) {
  67               cyclesDuration.addAndGet(d);
  68             } else {
  69               throw new IllegalStateException("Unknown name: " + name);
  70             }
  71           }
  72         }
  73       }
  74     };
  75 
  76     for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
  77       ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
  78     }
  79 
  80     final int size = 100_000;
  81     long count = TARGET_MB * 1024 * 1024 / (16 + 4*size);
  82 
  83     for (int c = 0; c < count; c++) {
  84        sink = new int[size];
  85     }
  86 
  87     Thread.sleep(1000);
  88 
  89     long pausesActual = pausesDuration.get();
  90     long cyclesActual = cyclesDuration.get();
  91 
  92     long minExpected = 1;
  93     long maxExpected = Long.MAX_VALUE;
  94 
  95     {
  96       String msg = "Pauses expected = [" + minExpected + "; " + maxExpected + "], actual = " + pausesActual;
  97       if (minExpected < pausesActual && pausesActual < maxExpected) {
  98         System.out.println(msg);
  99       } else {
 100         throw new IllegalStateException(msg);
 101       }
 102     }
 103 
 104     {
 105       String msg = "Cycles expected = [" + minExpected + "; " + maxExpected + "], actual = " + cyclesActual;
 106       if (minExpected < cyclesActual && cyclesActual < maxExpected) {
 107         System.out.println(msg);
 108       } else {
 109         throw new IllegalStateException(msg);
 110       }
 111     }
 112 
 113     {
 114       String msg = "Cycle duration (" + cyclesActual + "), pause duration (" + pausesActual + ")";
 115       if (pausesActual < cyclesActual) {
 116         System.out.println(msg);
 117       } else {
 118         throw new IllegalStateException(msg);
 119       }
 120     }
 121   }
 122 }
 123 
 124