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 & !vm.graal.enabled
28 *
29 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
30 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
31 * -XX:+ShenandoahDegeneratedGC -Dprecise=true
32 * TestChurnNotifications
33 *
34 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
35 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
36 * -XX:-ShenandoahDegeneratedGC -Dprecise=true
37 * TestChurnNotifications
38 */
39
40 /*
41 * @test TestChurnNotifications
42 * @summary Check that MX notifications are reported for all cycles
43 * @requires vm.gc.Shenandoah & !vm.graal.enabled
44 *
45 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
46 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
47 * -Dprecise=false
48 * TestChurnNotifications
49 *
50 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
51 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
52 * -Dprecise=false
53 * TestChurnNotifications
54 *
55 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
56 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
57 * -Dprecise=false
58 * TestChurnNotifications
59 *
60 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
61 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
62 * -Dprecise=false
63 * TestChurnNotifications
64 */
65
66 /*
67 * @test TestChurnNotifications
68 * @summary Check that MX notifications are reported for all cycles
69 * @requires vm.gc.Shenandoah & !vm.graal.enabled
70 *
71 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
72 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal -XX:ShenandoahGCHeuristics=aggressive
73 * -Dprecise=false
74 * TestChurnNotifications
75 *
76 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
77 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal
78 * -Dprecise=false
79 * TestChurnNotifications
80 */
81
82 import java.util.*;
83 import java.util.concurrent.atomic.*;
84 import javax.management.*;
85 import java.lang.management.*;
86 import javax.management.openmbean.*;
87
88 import com.sun.management.GarbageCollectionNotificationInfo;
89
90 public class TestChurnNotifications {
91
92 static final long HEAP_MB = 128; // adjust for test configuration above
93 static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation
94
95 // Should we track the churn precisely?
96 // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise,
97 // we cannot tell, looking at heap used before/after, what was the GC churn.
98 static final boolean PRECISE = Boolean.getBoolean("precise");
99
100 static final long M = 1024 * 1024;
101
102 static volatile Object sink;
103
104 public static void main(String[] args) throws Exception {
105 final AtomicLong churnBytes = new AtomicLong();
106
107 NotificationListener listener = new NotificationListener() {
108 @Override
109 public void handleNotification(Notification n, Object o) {
110 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
111 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
112 Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc();
113 Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc();
114
115 MemoryUsage before = mapBefore.get("Shenandoah");
116 MemoryUsage after = mapAfter.get("Shenandoah");
117
118 if ((before != null) && (after != null)) {
119 long diff = before.getUsed() - after.getUsed();
120 if (diff > 0) {
121 churnBytes.addAndGet(diff);
122 }
123 }
124 }
125 }
126 };
127
128 for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
129 ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
130 }
131
132 final int size = 100_000;
133 long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
134
135 long mem = count * (16 + 4 * size);
136
137 for (int c = 0; c < count; c++) {
138 sink = new int[size];
139 }
140
141 System.gc();
142
143 Thread.sleep(1000);
144
145 long actual = churnBytes.get();
146
147 long minExpected = PRECISE ? (mem - HEAP_MB * 1024 * 1024) : 1;
148 long maxExpected = mem + HEAP_MB * 1024 * 1024;
149
150 String msg = "Expected = [" + minExpected / M + "; " + maxExpected / M + "] (" + mem / M + "), actual = " + actual / M;
151 if (minExpected < actual && actual < maxExpected) {
152 System.out.println(msg);
153 } else {
154 throw new IllegalStateException(msg);
155 }
156 }
157 }