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 -XX:ShenandoahGCHeuristics=passive -XX:+ShenandoahDegeneratedGC PauseNotifications
29 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=passive -XX:-ShenandoahDegeneratedGC PauseNotifications
30 *
31 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive PauseNotifications
32 *
33 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=adaptive PauseNotifications
34 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=static PauseNotifications
35 * @run main/othervm -Xmx128m -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=compact PauseNotifications
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 import com.sun.management.GarbageCollectionNotificationInfo;
44
45 public class PauseNotifications {
46
47 static final long HEAP_MB = 128; // adjust for test configuration above
48 static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation
49
50 static volatile Object sink;
51
52 public static void main(String[] args) throws Exception {
53 final AtomicLong pausesDuration = new AtomicLong();
54 final AtomicLong cyclesDuration = new AtomicLong();
55
56 NotificationListener listener = new NotificationListener() {
57 @Override
58 public void handleNotification(Notification n, Object o) {
59 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
60 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData)n.getUserData());
61
62 long d = info.getGcInfo().getDuration();
63
64 String name = info.getGcName();
65 if (name.contains("Shenandoah")) {
66 if (name.equals("Shenandoah Pauses")) {
67 pausesDuration.addAndGet(d);
68 } else if (name.equals("Shenandoah Cycles")) {
69 cyclesDuration.addAndGet(d);
70 } else {
71 throw new IllegalStateException("Unknown name: " + name);
72 }
73 }
74 }
75 }
76 };
77
78 for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
79 ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
80 }
81
82 final int size = 100_000;
83 long count = TARGET_MB * 1024 * 1024 / (16 + 4*size);
84
85 for (int c = 0; c < count; c++) {
86 sink = new int[size];
87 }
88
89 Thread.sleep(1000);
90
91 long pausesActual = pausesDuration.get();
92 long cyclesActual = cyclesDuration.get();
93
94 long minExpected = 1;
95 long maxExpected = Long.MAX_VALUE;
96
97 {
98 String msg = "Pauses expected = [" + minExpected + "; " + maxExpected + "], actual = " + pausesActual;
99 if (minExpected < pausesActual && pausesActual < maxExpected) {
100 System.out.println(msg);
101 } else {
102 throw new IllegalStateException(msg);
103 }
104 }
105
106 {
107 String msg = "Cycles expected = [" + minExpected + "; " + maxExpected + "], actual = " + cyclesActual;
108 if (minExpected < cyclesActual && cyclesActual < maxExpected) {
109 System.out.println(msg);
110 } else {
111 throw new IllegalStateException(msg);
112 }
113 }
114
115 {
116 String msg = "Cycle duration (" + cyclesActual + "), pause duration (" + pausesActual + ")";
117 if (pausesActual < cyclesActual) {
118 System.out.println(msg);
119 } else {
120 throw new IllegalStateException(msg);
121 }
122 }
123 }
124 }
125
126