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:ShenandoahGCHeuristics=passive -XX:+ShenandoahDegeneratedGC TestPauseNotifications
30 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=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
39 import java.util.*;
40 import java.util.concurrent.atomic.*;
41 import javax.management.*;
42 import java.lang.management.*;
43 import javax.management.openmbean.*;
44 import com.sun.management.GarbageCollectionNotificationInfo;
45
46 public class TestPauseNotifications {
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 static volatile Object sink;
52
53 public static void main(String[] args) throws Exception {
54 final AtomicLong pausesDuration = new AtomicLong();
55 final AtomicLong cyclesDuration = new AtomicLong();
56
57 NotificationListener listener = new NotificationListener() {
58 @Override
59 public void handleNotification(Notification n, Object o) {
60 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
61 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
62
63 long d = info.getGcInfo().getDuration();
64
65 String name = info.getGcName();
66 if (name.contains("Shenandoah")) {
67 if (name.equals("Shenandoah Pauses")) {
68 pausesDuration.addAndGet(d);
69 } else if (name.equals("Shenandoah Cycles")) {
70 cyclesDuration.addAndGet(d);
71 } else {
72 throw new IllegalStateException("Unknown name: " + name);
73 }
74 }
75 }
76 }
77 };
78
79 for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
80 ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
81 }
82
83 final int size = 100_000;
84 long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
85
86 for (int c = 0; c < count; c++) {
87 sink = new int[size];
88 }
89
90 Thread.sleep(1000);
91
92 long pausesActual = pausesDuration.get();
93 long cyclesActual = cyclesDuration.get();
94
95 long minExpected = 1;
96 long maxExpected = Long.MAX_VALUE;
97
98 {
99 String msg = "Pauses expected = [" + minExpected + "; " + maxExpected + "], actual = " + pausesActual;
100 if (minExpected < pausesActual && pausesActual < maxExpected) {
101 System.out.println(msg);
102 } else {
103 throw new IllegalStateException(msg);
104 }
105 }
106
107 {
108 String msg = "Cycles expected = [" + minExpected + "; " + maxExpected + "], actual = " + cyclesActual;
109 if (minExpected < cyclesActual && cyclesActual < maxExpected) {
110 System.out.println(msg);
111 } else {
112 throw new IllegalStateException(msg);
113 }
114 }
115
116 {
117 String msg = "Cycle duration (" + cyclesActual + "), pause duration (" + pausesActual + ")";
118 if (pausesActual < cyclesActual) {
119 System.out.println(msg);
120 } else {
121 throw new IllegalStateException(msg);
122 }
123 }
124 }
125 }