1 /*
2 * Copyright (c) 2003, 2018, Oracle and/or its affiliates. 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 * The -XX:MarkSweepAlwaysCompactCount=1 argument below makes sure serial gc
26 * compacts the heap at every full gc so that the usage is correctly updated.
27 */
28
29 /*
30 * @test
31 * @bug 4892507
32 * @summary Basic Test for MemoryPool.resetPeakUsage()
33 * @author Mandy Chung
34 *
35 * @requires vm.opt.ExplicitGCInvokesConcurrent != "true"
36 * @requires vm.opt.DisableExplicitGC != "true"
37 * @library /lib/testlibrary/ /test/lib
38 * @modules jdk.management
39 *
40 * @build jdk.testlibrary.* ResetPeakMemoryUsage MemoryUtil RunUtil
41 * @build sun.hotspot.WhiteBox
42 * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
43 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. ResetPeakMemoryUsage
44 */
45
46 import java.lang.management.*;
47 import java.lang.ref.WeakReference;
48 import java.util.*;
49
50 import sun.hotspot.code.Compiler;
51 import sun.hotspot.WhiteBox;
52
53 public class ResetPeakMemoryUsage {
54 private static MemoryMXBean mbean = ManagementFactory.getMemoryMXBean();
55 // make public so that it can't be optimized away easily
56 public static Object[] obj;
57
58 /**
59 * Run the test multiple times with different GC versions.
60 * First with default command line specified by the framework.
61 * Then with all GC versions specified by the test.
62 */
63 public static void main(String a[]) throws Throwable {
64 final String main = "ResetPeakMemoryUsage$TestMain";
65 final String ms = "-Xms256m";
66 final String mn = "-Xmn8m";
67 if (!Compiler.isGraalEnabled()) { // Graal does not support CMS
68 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseConcMarkSweepGC");
69 }
70 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseParallelGC");
71 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseG1GC", "-XX:-G1UseLegacyMonitoring",
72 "-XX:G1HeapRegionSize=1m");
73 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseG1GC", "-XX:+G1UseLegacyMonitoring",
74 "-XX:G1HeapRegionSize=1m");
75 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseSerialGC",
76 "-XX:MarkSweepAlwaysCompactCount=1");
77 }
78
79 private static class TestMain {
80 public static void main(String[] argv) {
81 List pools = ManagementFactory.getMemoryPoolMXBeans();
82 ListIterator iter = pools.listIterator();
83 boolean found = false;
84 while (iter.hasNext()) {
85 MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next();
86 // Only check heap pools that support a usage threshold.
87 // This is typically only the old generation space
88 // since the other spaces are expected to get filled up.
89 if (p.getType() == MemoryType.HEAP &&
90 p.isUsageThresholdSupported()) {
91 // In all collectors except G1, only the old generation supports a
92 // usage threshold. The G1 legacy mode "G1 Old Gen" also does. In
93 // G1 default mode, both the old space ("G1 Old Space": it's not
94 // really a generation in the non-G1 collector sense) and the
95 // humongous space ("G1 Humongous Space"), support a usage threshold.
96 // So, the following condition is true for all non-G1 old generations,
97 // for the G1 legacy old gen, and for the G1 default humongous space.
98 // It is not true for the G1 default old gen.
99 //
100 // We're allocating humongous objects in this test, so the G1 default
101 // mode "G1 Old Space" occupancy doesn't change, because humongous
102 // objects are allocated in the "G1 Humongous Space". If we allowed
103 // the G1 default mode "G1 Old Space", notification would never
104 // happen because no objects are allocated there.
105 if (!p.getName().equals("G1 Old Space")) {
106 found = true;
107 testPool(p);
108 }
109 }
110 }
111 if (!found) {
112 throw new RuntimeException("No heap pool found");
113 }
114 }
115 }
116
117 private static void testPool(MemoryPoolMXBean mpool) {
118 System.out.println("Selected memory pool: ");
119 MemoryUtil.printMemoryPool(mpool);
120
121 MemoryUsage usage0 = mpool.getUsage();
122 MemoryUsage peak0 = mpool.getPeakUsage();
123
124 // use a size that is larger than the young generation and G1 regions
125 // to force the array into the old gen
126 int largeArraySize = 9 * 1000 * 1000;
127
128 System.out.println("Before big object array (of size "+largeArraySize+") is allocated: ");
129 printMemoryUsage(usage0, peak0);
130
131 obj = new Object[largeArraySize];
132 WeakReference<Object> weakRef = new WeakReference<>(obj);
133
134 MemoryUsage usage1 = mpool.getUsage();
135 MemoryUsage peak1 = mpool.getPeakUsage();
136 System.out.println("After the object is allocated: ");
137 printMemoryUsage(usage1, peak1);
138
139 if (usage1.getUsed() <= usage0.getUsed()) {
140 throw new RuntimeException(
141 formatSize("Before allocation: used", usage0.getUsed()) +
142 " expected to be < " +
143 formatSize("After allocation: used", usage1.getUsed()));
144 }
145
146 if (peak1.getUsed() <= peak0.getUsed()) {
147 throw new RuntimeException(
148 formatSize("Before allocation: peak", peak0.getUsed()) +
149 " expected to be < " +
150 formatSize("After allocation: peak", peak1.getUsed()));
151 }
152
153 // The object is now garbage and do a GC. Memory usage should drop.
154 obj = null;
155
156 // This will cause a sure shot GC unlike Runtime.gc() invoked by mbean.gc()
157 while (weakRef.get() != null) {
158 mbean.gc();
159 }
160
161 MemoryUsage usage2 = mpool.getUsage();
162 MemoryUsage peak2 = mpool.getPeakUsage();
163 System.out.println("After GC: ");
164 printMemoryUsage(usage2, peak2);
165
166 if (usage2.getUsed() >= usage1.getUsed()) {
167 throw new RuntimeException(
168 formatSize("Before GC: used", usage1.getUsed()) + " " +
169 " expected to be > " +
170 formatSize("After GC: used", usage2.getUsed()));
171 }
172
173 mpool.resetPeakUsage();
174
175 MemoryUsage usage3 = mpool.getUsage();
176 MemoryUsage peak3 = mpool.getPeakUsage();
177 System.out.println("After resetPeakUsage: ");
178 printMemoryUsage(usage3, peak3);
179
180 if (peak3.getUsed() != usage3.getUsed()) {
181 throw new RuntimeException(
182 formatSize("After resetting peak: peak", peak3.getUsed()) + " " +
183 " expected to be equal to " +
184 formatSize("current used", usage3.getUsed()));
185 }
186
187 if (peak3.getUsed() >= peak2.getUsed()) {
188 throw new RuntimeException(
189 formatSize("After resetting peak: peak", peak3.getUsed()) + " " +
190 " expected to be < " +
191 formatSize("previous peak", peak2.getUsed()));
192 }
193
194 System.out.println(RunUtil.successMessage);
195 }
196
197 private static String INDENT = " ";
198 private static void printMemoryUsage(MemoryUsage current, MemoryUsage peak) {
199 System.out.println("Current Usage: ");
200 MemoryUtil.printMemoryUsage(current);
201 System.out.println("Peak Usage: ");
202 MemoryUtil.printMemoryUsage(peak);
203
204 }
205 private static String formatSize(String name, long value) {
206 StringBuffer buf = new StringBuffer(name + " = " + value);
207 if (value > 0) {
208 buf.append(" (" + (value >> 10) + "K)");
209 }
210 return buf.toString();
211 }
212 }