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 /test/lib
38 * @modules jdk.management
39 *
40 * @build ResetPeakMemoryUsage MemoryUtil RunUtil
41 * @build sun.hotspot.WhiteBox
42 * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
43 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. ResetPeakMemoryUsage
44 */
45
46 import java.lang.management.*;
47 import java.lang.ref.WeakReference;
48 import java.util.*;
49
50 import sun.hotspot.code.Compiler;
51
52 public class ResetPeakMemoryUsage {
53 private static MemoryMXBean mbean = ManagementFactory.getMemoryMXBean();
54 // make public so that it can't be optimized away easily
55 public static Object[] obj;
56
57 /**
58 * Run the test multiple times with different GC versions.
59 * First with default command line specified by the framework.
60 * Then with all GC versions specified by the test.
61 */
62 public static void main(String a[]) throws Throwable {
63 final String main = "ResetPeakMemoryUsage$TestMain";
64 final String ms = "-Xms256m";
65 final String mn = "-Xmn8m";
66 if (!Compiler.isGraalEnabled()) { // Graal does not support CMS
67 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseConcMarkSweepGC");
68 }
69 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseParallelGC");
70 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseG1GC", "-XX:G1HeapRegionSize=1m");
71 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseSerialGC",
72 "-XX:MarkSweepAlwaysCompactCount=1");
73 }
74
75 private static class TestMain {
76 public static void main(String[] argv) {
77 List pools = ManagementFactory.getMemoryPoolMXBeans();
78 ListIterator iter = pools.listIterator();
79 boolean found = false;
80 while (iter.hasNext()) {
81 MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next();
82 // only check heap pools that support usage threshold
83 // this is typically only the old generation space
84 // since the other spaces are expected to get filled up
85 if (p.getType() == MemoryType.HEAP &&
86 p.isUsageThresholdSupported())
87 {
88 found = true;
89 testPool(p);
90 }
91 }
92 if (!found) {
93 throw new RuntimeException("No heap pool found");
94 }
95 }
96 }
97
98 private static void testPool(MemoryPoolMXBean mpool) {
99 System.out.println("Selected memory pool: ");
100 MemoryUtil.printMemoryPool(mpool);
101
102 MemoryUsage usage0 = mpool.getUsage();
103 MemoryUsage peak0 = mpool.getPeakUsage();
104
105 // use a size that is larger than the young generation and G1 regions
106 // to force the array into the old gen
107 int largeArraySize = 9 * 1000 * 1000;
108
109 System.out.println("Before big object array (of size "+largeArraySize+") is allocated: ");
110 printMemoryUsage(usage0, peak0);
111
112 obj = new Object[largeArraySize];
113 WeakReference<Object> weakRef = new WeakReference<>(obj);
114
115 MemoryUsage usage1 = mpool.getUsage();
116 MemoryUsage peak1 = mpool.getPeakUsage();
117 System.out.println("After the object is allocated: ");
118 printMemoryUsage(usage1, peak1);
119
120 if (usage1.getUsed() <= usage0.getUsed()) {
121 throw new RuntimeException(
122 formatSize("Before allocation: used", usage0.getUsed()) +
123 " expected to be < " +
124 formatSize("After allocation: used", usage1.getUsed()));
125 }
126
127 if (peak1.getUsed() <= peak0.getUsed()) {
128 throw new RuntimeException(
129 formatSize("Before allocation: peak", peak0.getUsed()) +
130 " expected to be < " +
131 formatSize("After allocation: peak", peak1.getUsed()));
132 }
133
134
135 // The object is now garbage and do a GC
136 // memory usage should drop
137 obj = null;
138
139 //This will cause sure shot GC unlike Runtime.gc() invoked by mbean.gc()
140 while(weakRef.get() != null) {
141 mbean.gc();
142 }
143
144 MemoryUsage usage2 = mpool.getUsage();
145 MemoryUsage peak2 = mpool.getPeakUsage();
146 System.out.println("After GC: ");
147 printMemoryUsage(usage2, peak2);
148
149 if (usage2.getUsed() >= usage1.getUsed()) {
150 throw new RuntimeException(
151 formatSize("Before GC: used", usage1.getUsed()) + " " +
152 " expected to be > " +
153 formatSize("After GC: used", usage2.getUsed()));
154 }
155
156 mpool.resetPeakUsage();
157
158 MemoryUsage usage3 = mpool.getUsage();
159 MemoryUsage peak3 = mpool.getPeakUsage();
160 System.out.println("After resetPeakUsage: ");
161 printMemoryUsage(usage3, peak3);
162
163 if (peak3.getUsed() != usage3.getUsed()) {
164 throw new RuntimeException(
165 formatSize("After resetting peak: peak", peak3.getUsed()) + " " +
166 " expected to be equal to " +
167 formatSize("current used", usage3.getUsed()));
168 }
169
170 if (peak3.getUsed() >= peak2.getUsed()) {
171 throw new RuntimeException(
172 formatSize("After resetting peak: peak", peak3.getUsed()) + " " +
173 " expected to be < " +
174 formatSize("previous peak", peak2.getUsed()));
175 }
176
177 System.out.println(RunUtil.successMessage);
178 }
179
180 private static String INDENT = " ";
181 private static void printMemoryUsage(MemoryUsage current, MemoryUsage peak) {
182 System.out.println("Current Usage: ");
183 MemoryUtil.printMemoryUsage(current);
184 System.out.println("Peak Usage: ");
185 MemoryUtil.printMemoryUsage(peak);
186
187 }
188 private static String formatSize(String name, long value) {
189 StringBuffer buf = new StringBuffer(name + " = " + value);
190 if (value > 0) {
191 buf.append(" (" + (value >> 10) + "K)");
192 }
193 return buf.toString();
194 }
195 }