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 * @key gc
28 *
29 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive -XX:+ShenandoahDegeneratedGC -Dprecise=true TestChurnNotifications
30 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive -XX:-ShenandoahDegeneratedGC -Dprecise=true TestChurnNotifications
31 *
32 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive -Dprecise=false TestChurnNotifications
33 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static -Dprecise=false TestChurnNotifications
34 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact -Dprecise=false TestChurnNotifications
35 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive -Dprecise=false TestChurnNotifications
36 */
37
38 import java.util.*;
39 import java.util.concurrent.atomic.*;
40 import javax.management.*;
41 import java.lang.management.*;
42 import javax.management.openmbean.*;
43
44 import com.sun.management.GarbageCollectionNotificationInfo;
45
46 public class TestChurnNotifications {
47
48 static final long HEAP_MB = 128; // adjust for test configuration above
49 static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation
50
51 // Should we track the churn precisely?
52 // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise,
53 // we cannot tell, looking at heap used before/after, what was the GC churn.
54 static final boolean PRECISE = Boolean.getBoolean("precise");
55
56 static final long M = 1024 * 1024;
57
58 static volatile Object sink;
59
60 public static void main(String[] args) throws Exception {
61 final AtomicLong churnBytes = new AtomicLong();
62
63 NotificationListener listener = new NotificationListener() {
64 @Override
65 public void handleNotification(Notification n, Object o) {
66 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
67 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
68 Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc();
69 Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc();
70
71 MemoryUsage before = mapBefore.get("Shenandoah");
72 MemoryUsage after = mapAfter.get("Shenandoah");
73
74 if ((before != null) && (after != null)) {
75 long diff = before.getUsed() - after.getUsed();
76 if (diff > 0) {
77 churnBytes.addAndGet(diff);
78 }
79 }
80 }
81 }
82 };
83
84 for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
85 ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
86 }
87
88 final int size = 100_000;
89 long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
90
91 long mem = count * (16 + 4 * size);
92
93 for (int c = 0; c < count; c++) {
94 sink = new int[size];
95 }
96
97 System.gc();
98
99 Thread.sleep(1000);
100
101 long actual = churnBytes.get();
102
103 long minExpected = PRECISE ? (mem - HEAP_MB * 1024 * 1024) : 1;
104 long maxExpected = mem + HEAP_MB * 1024 * 1024;
105
106 String msg = "Expected = [" + minExpected / M + "; " + maxExpected / M + "] (" + mem / M + "), actual = " + actual / M;
107 if (minExpected < actual && actual < maxExpected) {
108 System.out.println(msg);
109 } else {
110 throw new IllegalStateException(msg);
111 }
112 }
113 }