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 TestChurnNotifications 26 * @summary Check that MX notifications are reported for all cycles 27 * @requires vm.gc.Shenandoah 28 * 29 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=passive -XX:+ShenandoahDegeneratedGC -Dprecise=true TestChurnNotifications 30 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=passive -XX:-ShenandoahDegeneratedGC -Dprecise=true TestChurnNotifications 31 * 32 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive -Dprecise=false TestChurnNotifications 33 * 34 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive -Dprecise=false TestChurnNotifications 35 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static -Dprecise=false TestChurnNotifications 36 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact -Dprecise=false TestChurnNotifications 37 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=traversal -Dprecise=false TestChurnNotifications 38 */ 39 40 import java.util.*; 41 import java.util.concurrent.atomic.*; 42 import javax.management.*; 43 import java.lang.management.*; 44 import javax.management.openmbean.*; 45 46 import com.sun.management.GarbageCollectionNotificationInfo; 47 48 public class TestChurnNotifications { 49 50 static final long HEAP_MB = 128; // adjust for test configuration above 51 static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation 52 53 // Should we track the churn precisely? 54 // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise, 55 // we cannot tell, looking at heap used before/after, what was the GC churn. 56 static final boolean PRECISE = Boolean.getBoolean("precise"); 57 58 static final long M = 1024 * 1024; 59 60 static volatile Object sink; 61 62 public static void main(String[] args) throws Exception { 63 final AtomicLong churnBytes = new AtomicLong(); 64 65 NotificationListener listener = new NotificationListener() { 66 @Override 67 public void handleNotification(Notification n, Object o) { 68 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) { 69 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData()); 70 Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc(); 71 Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc(); 72 73 MemoryUsage before = mapBefore.get("Shenandoah"); 74 MemoryUsage after = mapAfter.get("Shenandoah"); 75 76 if ((before != null) && (after != null)) { 77 long diff = before.getUsed() - after.getUsed(); 78 if (diff > 0) { 79 churnBytes.addAndGet(diff); 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 long mem = count * (16 + 4 * size); 94 95 for (int c = 0; c < count; c++) { 96 sink = new int[size]; 97 } 98 99 System.gc(); 100 101 Thread.sleep(1000); 102 103 long actual = churnBytes.get(); 104 105 long minExpected = PRECISE ? (mem - HEAP_MB * 1024 * 1024) : 1; 106 long maxExpected = mem + HEAP_MB * 1024 * 1024; 107 108 String msg = "Expected = [" + minExpected / M + "; " + maxExpected / M + "] (" + mem / M + "), actual = " + actual / M; 109 if (minExpected < actual && actual < maxExpected) { 110 System.out.println(msg); 111 } else { 112 throw new IllegalStateException(msg); 113 } 114 } 115 }