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 import java.util.*;
68 import java.util.concurrent.atomic.*;
69 import javax.management.*;
70 import java.lang.management.*;
71 import javax.management.openmbean.*;
72
73 import com.sun.management.GarbageCollectionNotificationInfo;
74
75 public class TestChurnNotifications {
76
77 static final long HEAP_MB = 128; // adjust for test configuration above
78 static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation
79
80 // Should we track the churn precisely?
81 // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise,
82 // we cannot tell, looking at heap used before/after, what was the GC churn.
83 static final boolean PRECISE = Boolean.getBoolean("precise");
84
85 static final long M = 1024 * 1024;
86
87 static volatile Object sink;
88
89 public static void main(String[] args) throws Exception {
90 final AtomicLong churnBytes = new AtomicLong();
91
92 NotificationListener listener = new NotificationListener() {
93 @Override
94 public void handleNotification(Notification n, Object o) {
95 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
96 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
97 Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc();
98 Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc();
99
100 MemoryUsage before = mapBefore.get("Shenandoah");
101 MemoryUsage after = mapAfter.get("Shenandoah");
102
103 if ((before != null) && (after != null)) {
104 long diff = before.getUsed() - after.getUsed();
105 if (diff > 0) {
106 churnBytes.addAndGet(diff);
107 }
108 }
109 }
110 }
111 };
112
113 for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
114 ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
115 }
116
117 final int size = 100_000;
118 long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
119
120 long mem = count * (16 + 4 * size);
121
122 for (int c = 0; c < count; c++) {
123 sink = new int[size];
124 }
125
126 System.gc();
127
128 Thread.sleep(1000);
129
130 long actual = churnBytes.get();
131
132 long minExpected = PRECISE ? (mem - HEAP_MB * 1024 * 1024) : 1;
133 long maxExpected = mem + HEAP_MB * 1024 * 1024;
134
135 String msg = "Expected = [" + minExpected / M + "; " + maxExpected / M + "] (" + mem / M + "), actual = " + actual / M;
136 if (minExpected < actual && actual < maxExpected) {
137 System.out.println(msg);
138 } else {
139 throw new IllegalStateException(msg);
140 }
141 }
142 }