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 id=passive
27 * @summary Check that MX notifications are reported for all cycles
28 * @library /test/lib /
29 * @requires vm.gc.Shenandoah
30 *
31 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
32 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
33 * -XX:+ShenandoahDegeneratedGC -Dprecise=true
34 * TestChurnNotifications
35 *
36 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
37 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
38 * -XX:-ShenandoahDegeneratedGC -Dprecise=true
39 * TestChurnNotifications
40 */
41
42 /*
43 * @test id=aggressive
44 * @summary Check that MX notifications are reported for all cycles
45 * @library /test/lib /
46 * @requires vm.gc.Shenandoah
47 *
48 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
49 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
50 * -Dprecise=false
51 * TestChurnNotifications
52 */
53
54 /*
55 * @test id=adaptive
56 * @summary Check that MX notifications are reported for all cycles
57 * @library /test/lib /
58 * @requires vm.gc.Shenandoah
59 *
60 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
61 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
62 * -Dprecise=false
63 * TestChurnNotifications
64 */
65
66 /*
67 * @test id=static
68 * @summary Check that MX notifications are reported for all cycles
69 * @library /test/lib /
70 * @requires vm.gc.Shenandoah
71 *
72 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
73 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
74 * -Dprecise=false
75 * TestChurnNotifications
76 */
77
78 /*
79 * @test id=compact
80 * @summary Check that MX notifications are reported for all cycles
81 * @library /test/lib /
82 * @requires vm.gc.Shenandoah
83 *
84 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
85 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
86 * -Dprecise=false
87 * TestChurnNotifications
88 */
89
90 /*
91 * @test id=iu
92 * @summary Check that MX notifications are reported for all cycles
93 * @library /test/lib /
94 * @requires vm.gc.Shenandoah
95 *
96 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
97 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
98 * -Dprecise=false
99 * TestChurnNotifications
100 *
101 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
102 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
103 * -Dprecise=false
104 * TestChurnNotifications
105 */
106
107 import java.util.*;
108 import java.util.concurrent.atomic.*;
109 import javax.management.*;
110 import java.lang.management.*;
111 import javax.management.openmbean.*;
112
113 import jdk.test.lib.Utils;
114
115 import com.sun.management.GarbageCollectionNotificationInfo;
116
117 public class TestChurnNotifications {
118
119 static final long HEAP_MB = 128; // adjust for test configuration above
120 static final long TARGET_MB = Long.getLong("target", 2_000); // 2 Gb allocation
121
122 // Should we track the churn precisely?
123 // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise,
124 // we cannot tell, looking at heap used before/after, what was the GC churn.
125 static final boolean PRECISE = Boolean.getBoolean("precise");
126
127 static final long M = 1024 * 1024;
128
129 static volatile Object sink;
130
131 public static void main(String[] args) throws Exception {
132 final long startTimeNanos = System.nanoTime();
133
134 final AtomicLong churnBytes = new AtomicLong();
135
136 NotificationListener listener = new NotificationListener() {
137 @Override
138 public void handleNotification(Notification n, Object o) {
139 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
140 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
141 Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc();
142 Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc();
143
144 MemoryUsage before = mapBefore.get("Shenandoah");
145 MemoryUsage after = mapAfter.get("Shenandoah");
146
147 if ((before != null) && (after != null)) {
148 long diff = before.getUsed() - after.getUsed();
149 if (diff > 0) {
150 churnBytes.addAndGet(diff);
151 }
152 }
153 }
154 }
155 };
156
157 for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
158 ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
159 }
160
161 final int size = 100_000;
162 long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
163
164 long mem = count * (16 + 4 * size);
165
166 for (int c = 0; c < count; c++) {
167 sink = new int[size];
168 }
169
170 System.gc();
171
172 long minExpected = PRECISE ? (mem - HEAP_MB * 1024 * 1024) : 1;
173 long maxExpected = mem + HEAP_MB * 1024 * 1024;
174 long actual = 0;
175
176 // Look at test timeout to figure out how long we can wait without breaking into timeout.
177 // Default to 1/4 of the remaining time in 1s steps.
178 final long STEP_MS = 1000;
179 long spentTimeNanos = System.nanoTime() - startTimeNanos;
180 long maxTries = (Utils.adjustTimeout(Utils.DEFAULT_TEST_TIMEOUT) - (spentTimeNanos / 1_000_000L)) / STEP_MS / 4;
181
182 // Wait until enough notifications are accrued to match minimum boundary.
183 long tries = 0;
184 while (tries++ < maxTries) {
185 actual = churnBytes.get();
186 if (minExpected <= actual) {
187 // Wait some more to test if we are breaking the maximum boundary.
188 Thread.sleep(5000);
189 actual = churnBytes.get();
190 break;
191 }
192 Thread.sleep(STEP_MS);
193 }
194
195 String msg = "Expected = [" + minExpected / M + "; " + maxExpected / M + "] (" + mem / M + "), actual = " + actual / M;
196 if (minExpected <= actual && actual <= maxExpected) {
197 System.out.println(msg);
198 } else {
199 throw new IllegalStateException(msg);
200 }
201 }
202 }