1 /*
2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 /*
26 * @test TestChurnNotifications
27 * @summary Check that MX notifications are reported for all cycles
28 * @requires vm.gc.Shenandoah & !vm.graal.enabled
29 *
30 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
31 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
32 * -XX:+ShenandoahDegeneratedGC -Dprecise=true
33 * TestChurnNotifications
34 *
35 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
36 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
37 * -XX:-ShenandoahDegeneratedGC -Dprecise=true
38 * TestChurnNotifications
39 */
40
41 /*
42 * @test TestChurnNotifications
43 * @summary Check that MX notifications are reported for all cycles
44 * @requires vm.gc.Shenandoah & !vm.graal.enabled
45 *
46 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
47 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
48 * -Dprecise=false
49 * TestChurnNotifications
50 *
51 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
52 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
53 * -Dprecise=false
54 * TestChurnNotifications
55 *
56 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
57 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
58 * -Dprecise=false
59 * TestChurnNotifications
60 *
61 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
62 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
63 * -Dprecise=false
64 * TestChurnNotifications
65 */
66
67 /*
68 * @test TestChurnNotifications
69 * @summary Check that MX notifications are reported for all cycles
70 * @requires vm.gc.Shenandoah & !vm.graal.enabled
71 *
72 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
73 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
74 * -Dprecise=false
75 * TestChurnNotifications
76 *
77 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
78 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
79 * -Dprecise=false
80 * TestChurnNotifications
81 */
82
83 import java.util.*;
84 import java.util.concurrent.atomic.*;
85 import javax.management.*;
86 import java.lang.management.*;
87 import javax.management.openmbean.*;
88
89 import com.sun.management.GarbageCollectionNotificationInfo;
90
91 public class TestChurnNotifications {
92
93 static final long HEAP_MB = 128; // adjust for test configuration above
94 static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation
95
96 // Should we track the churn precisely?
97 // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise,
98 // we cannot tell, looking at heap used before/after, what was the GC churn.
99 static final boolean PRECISE = Boolean.getBoolean("precise");
100
101 static final long M = 1024 * 1024;
102
103 static volatile Object sink;
104
105 public static void main(String[] args) throws Exception {
106 final AtomicLong churnBytes = new AtomicLong();
107
108 NotificationListener listener = new NotificationListener() {
109 @Override
110 public void handleNotification(Notification n, Object o) {
111 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
112 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
113 Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc();
114 Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc();
115
116 MemoryUsage before = mapBefore.get("Shenandoah");
117 MemoryUsage after = mapAfter.get("Shenandoah");
118
119 if ((before != null) && (after != null)) {
120 long diff = before.getUsed() - after.getUsed();
121 if (diff > 0) {
122 churnBytes.addAndGet(diff);
123 }
124 }
125 }
126 }
127 };
128
129 for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
130 ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
131 }
132
133 final int size = 100_000;
134 long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
135
136 long mem = count * (16 + 4 * size);
137
138 for (int c = 0; c < count; c++) {
139 sink = new int[size];
140 }
141
142 System.gc();
143
144 Thread.sleep(1000);
145
146 long actual = churnBytes.get();
147
148 long minExpected = PRECISE ? (mem - HEAP_MB * 1024 * 1024) : 1;
149 long maxExpected = mem + HEAP_MB * 1024 * 1024;
150
151 String msg = "Expected = [" + minExpected / M + "; " + maxExpected / M + "] (" + mem / M + "), actual = " + actual / M;
152 if (minExpected < actual && actual < maxExpected) {
153 System.out.println(msg);
154 } else {
155 throw new IllegalStateException(msg);
156 }
157 }
158 }