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 ChurnNotifications 26 * @summary Check that MX notifications are reported for all cycles 27 * 28 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=passive -XX:+ShenandoahDegeneratedGC -Dprecise=true ChurnNotifications 29 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=passive -XX:-ShenandoahDegeneratedGC -Dprecise=true ChurnNotifications 30 * 31 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=adaptive -Dprecise=false ChurnNotifications 32 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=static -Dprecise=false ChurnNotifications 33 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=compact -Dprecise=false ChurnNotifications 34 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -Dprecise=false ChurnNotifications 35 */ 36 37 import java.util.*; 38 import java.util.concurrent.atomic.*; 39 import javax.management.*; 40 import java.lang.management.*; 41 import javax.management.openmbean.*; 42 import com.sun.management.GarbageCollectionNotificationInfo; 43 44 public class ChurnNotifications { 45 46 static final long HEAP_MB = 128; // adjust for test configuration above 47 static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation 48 49 // Should we track the churn precisely? 50 // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise, 51 // we cannot tell, looking at heap used before/after, what was the GC churn. 52 static final boolean PRECISE = Boolean.getBoolean("precise"); 53 54 static final long M = 1024*1024; 55 56 static volatile Object sink; 57 58 public static void main(String[] args) throws Exception { 59 final AtomicLong churnBytes = new AtomicLong(); 60 61 NotificationListener listener = new NotificationListener() { 62 @Override 63 public void handleNotification(Notification n, Object o) { 64 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) { 65 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData)n.getUserData()); 66 Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc(); 67 Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc(); 68 69 MemoryUsage before = mapBefore.get("Shenandoah"); 70 MemoryUsage after = mapAfter.get("Shenandoah"); 71 72 if ((before != null) && (after != null)) { 73 long diff = before.getUsed() - after.getUsed(); 74 if (diff > 0) { 75 churnBytes.addAndGet(diff); 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 long mem = count * (16 + 4*size); 90 91 for (int c = 0; c < count; c++) { 92 sink = new int[size]; 93 } 94 95 System.gc(); 96 97 Thread.sleep(1000); 98 99 long actual = churnBytes.get(); 100 101 long minExpected = PRECISE ? (mem - HEAP_MB*1024*1024) : 1; 102 long maxExpected = mem + HEAP_MB*1024*1024; 103 104 String msg = "Expected = [" + minExpected/M +"; " + maxExpected/M + "] (" + mem/M + "), actual = " + actual/M; 105 if (minExpected < actual && actual < maxExpected) { 106 System.out.println(msg); 107 } else { 108 throw new IllegalStateException(msg); 109 } 110 } 111 } 112 113