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