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  *
  29  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive             -XX:+ShenandoahDegeneratedGC TestPauseNotifications
  30  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive             -XX:-ShenandoahDegeneratedGC TestPauseNotifications
  31  *
  32  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive    TestPauseNotifications
  33  *
  34  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive      TestPauseNotifications
  35  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static        TestPauseNotifications
  36  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact       TestPauseNotifications
  37  *
  38  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal -XX:ShenandoahGCHeuristics=aggressive       TestPauseNotifications
  39  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal TestPauseNotifications
  40  */
  41 
  42 import java.util.*;
  43 import java.util.concurrent.atomic.*;
  44 import javax.management.*;
  45 import java.lang.management.*;
  46 import javax.management.openmbean.*;
  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                     long d = info.getGcInfo().getDuration();
  67 
  68                     String name = info.getGcName();
  69                     if (name.contains("Shenandoah")) {
  70                         if (name.equals("Shenandoah Pauses")) {
  71                             pausesDuration.addAndGet(d);
  72                         } else if (name.equals("Shenandoah Cycles")) {
  73                             cyclesDuration.addAndGet(d);
  74                         } else {
  75                             throw new IllegalStateException("Unknown name: " + name);
  76                         }
  77                     }
  78                 }
  79             }
  80         };
  81 
  82         for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
  83             ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
  84         }
  85 
  86         final int size = 100_000;
  87         long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
  88 
  89         for (int c = 0; c < count; c++) {
  90             sink = new int[size];
  91         }
  92 
  93         Thread.sleep(1000);
  94 
  95         long pausesActual = pausesDuration.get();
  96         long cyclesActual = cyclesDuration.get();
  97 
  98         long minExpected = 1;
  99         long maxExpected = Long.MAX_VALUE;
 100 
 101         {
 102             String msg = "Pauses expected = [" + minExpected + "; " + maxExpected + "], actual = " + pausesActual;
 103             if (minExpected < pausesActual && pausesActual < maxExpected) {
 104                 System.out.println(msg);
 105             } else {
 106                 throw new IllegalStateException(msg);
 107             }
 108         }
 109 
 110         {
 111             String msg = "Cycles expected = [" + minExpected + "; " + maxExpected + "], actual = " + cyclesActual;
 112             if (minExpected < cyclesActual && cyclesActual < maxExpected) {
 113                 System.out.println(msg);
 114             } else {
 115                 throw new IllegalStateException(msg);
 116             }
 117         }
 118 
 119         {
 120             String msg = "Cycle duration (" + cyclesActual + "), pause duration (" + pausesActual + ")";
 121             if (pausesActual < cyclesActual) {
 122                 System.out.println(msg);
 123             } else {
 124                 throw new IllegalStateException(msg);
 125             }
 126         }
 127     }
 128 }